Air inlet box and air supply device for lithium battery manufacturing

Abstract

The utility model provides an air inlet box and an air supply device for lithium battery manufacturing, and relates to the field of lithium battery production. The utility model provides an air inlet box. The air inlet box comprises a closed box body; the partition plate is arranged in the closed box body and divides an inner cavity of the closed box body into a first cavity body and a second cavity body which are independent, the partition plate is provided with a flow guide hole, and the flow guide hole is provided with a filter layer; one end of the air inlet pipe communicates with the first cavity; and one end of the air outlet pipe communicates with the second cavity. Metal impurities in the air can be filtered, and the cleanliness of the air fed into the compressor is guaranteed. The utility model further provides an air supply device which comprises an air inlet box and further comprises a compressor. A connecting pipe; and the protective cover is arranged on the compressor, the connecting pipe and the air inlet box in a covering mode at the same time, two openings are formed in the protective cover, and the two openings are matched with installation of the air inlet pipe and the air outlet structure of the compressor correspondingly. The device is in a totally-enclosed environment, and metal impurities in the air are prevented from permeating from the joint.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery production technology, and more specifically, to an air inlet box and air supply device for lithium battery manufacturing. Background Technology

[0002] In the low-carbon era, energy efficiency comes first, and with the development of science and technology, lithium batteries have become mainstream. Lithium batteries mainly consist of a positive electrode, a negative electrode, an electrolyte, and a separator. The storage and release of lithium-ion energy is achieved through the redox reaction of the electrode materials. Among these, the positive and negative electrode active materials are the most critical core materials for lithium-ion batteries. The production process of these materials requires a large amount of compressed gas for processes such as sintering, air jet milling, and instrument power.

[0003] In existing technologies, compressors are typically used to supply compressed gas during the production of positive and negative electrode materials for lithium batteries. The air supplied in this way contains metallic impurities such as iron (Fe), copper (Cu), chromium (Cr), nickel (Ni), zinc (Zn), and silver (Ag). When the voltage during the battery formation stage reaches the redox potential of these metals (the aforementioned metallic impurities), these metals (the aforementioned metallic impurities) will first oxidize at the positive electrode and then be reduced at the negative electrode. When the metallic elements at the negative electrode accumulate to a certain extent, the hard edges of the deposited metal will pierce the separator, causing the battery to self-discharge, which will have a fatal impact on lithium-ion batteries. Utility Model Content

[0004] The purpose of this utility model is to provide an air inlet box and air supply device for lithium battery manufacturing, aiming to solve the technical problems in the background art mentioned above.

[0005] The technical solution of this utility model is implemented as follows:

[0006] In a first aspect, the technical solution of this application provides an air inlet box for lithium battery manufacturing, comprising:

[0007] Enclosed enclosure;

[0008] A partition plate is disposed inside the aforementioned enclosed box and divides the inner cavity of the aforementioned enclosed box into an independent first cavity and a second cavity. The partition plate is provided with a flow guide hole that connects the aforementioned first cavity and the aforementioned second cavity, and the flow guide hole is provided with a filter layer for filtering metal impurities.

[0009] An air inlet duct is provided on the outside of the aforementioned enclosed box, and one end of the air inlet duct is connected to the aforementioned first cavity;

[0010] An air outlet duct is located on the outside of the aforementioned enclosed housing, and one end of the air outlet duct is connected to the aforementioned second cavity.

[0011] Based on the first aspect, a further technical solution is that the aforementioned enclosed enclosure, the aforementioned partition plate, the aforementioned air inlet pipe, and the aforementioned air outlet pipe are all made of stainless steel.

[0012] Based on the first aspect, a further technical solution is that the above-mentioned filter layer is an activated carbon layer.

[0013] Based on the first aspect, a further technical solution is that the number of the above-mentioned flow guide holes is two, and each of the above-mentioned flow guide holes is provided with the above-mentioned filter layer.

[0014] Based on the first aspect, a further technical solution is that an installation plate is provided on the outside of the aforementioned enclosed box, and the installation plate is provided with installation holes.

[0015] Based on the first aspect, a further technical solution is that the outer side of the aforementioned enclosed housing is provided with a maintenance opening for replacing or maintaining the aforementioned filter layer, and the aforementioned maintenance opening is detachably provided with a sealing cover.

[0016] Secondly, embodiments of this application provide an air supply device, including the air inlet box as described above, and further including:

[0017] compressor;

[0018] A connecting pipe, one end of which is connected to the inlet of the compressor, and the other end of which is connected to the outlet pipe of the air inlet box.

[0019] The protective cover covers the compressor, the connecting pipe, and the air inlet box. The protective cover has two openings, which are respectively adapted to the installation of the air inlet pipe and the air outlet structure of the compressor.

[0020] Based on the second aspect, a further technical solution is that the material of the aforementioned protective cover is stainless steel.

[0021] Compared with the prior art, the technical solution of this utility model has at least the following advantages or beneficial effects:

[0022] (1) During the production of positive and negative electrode materials for lithium batteries, this application is installed on a compressor, and the air outlet pipe is connected to the compressor inlet. Outside air enters the first chamber through the air inlet pipe, the air in the first chamber enters the second chamber through the filter layer, and is then sent to the compressor through the air outlet pipe. Finally, it is sent to the manufacturing process (sintering, air jet milling, and instrument power processes, etc.) through the compressor. In the above process, the closed box and the filter layer form a sealed filter structure, which can filter out metal impurities in the air, ensure the cleanliness of the air sent to the compressor, and avoid the reduction of elemental metals at the negative electrode of the battery.

[0023] (2) When the air supply device provided in this application is applied to the production and manufacturing of lithium batteries, on the one hand, based on the cooperation of the air supply box and the compressor, it can filter the air (metal impurities) sent into the compressor and improve the cleanliness of the air; on the other hand, based on the overall enclosure of the compressor, the connecting pipe and the air supply box by the protective cover, the air supply device is in a fully enclosed environment, which prevents metal impurities in the air from entering through the gap between the air supply box and the connecting pipe or the gap between the connecting pipe and the compressor, further ensuring the cleanliness of the air and making it more practical. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of an air inlet box for lithium battery manufacturing according to an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of an air inlet box for lithium battery manufacturing with the sealing cover removed, according to an embodiment of this utility model.

[0027] Figure 3 This is a schematic diagram of the structure of an air supply device according to an embodiment of the present invention.

[0028] Icons: 100-Enclosed enclosure, 110-Protective cover, 111-Opening, 112-Connecting pipe, 113-Compressor, 200-Inlet pipe, 300-Outlet pipe, 400-Mounting plate, 500-Sealing cover, 600-Divider plate, 700-Filter layer, 800-First chamber, 900-Second chamber. Detailed Implementation

[0029] Example 1

[0030] Please refer to Figure 1 and Figure 2 This embodiment provides an air inlet box for lithium battery manufacturing, including a closed box 100. The closed box 100 is provided with a partition plate 600, which divides the inner cavity of the closed box 100 into two independent cavities. One cavity is defined as a first cavity 800, and the other cavity is defined as a second cavity 900. The partition plate 600 is provided with a guide hole connecting the first cavity 800 and the second cavity 900. The guide hole is provided with a filter layer 700 for filtering metal impurities.

[0031] Furthermore, an air inlet pipe 200 and an air outlet pipe 300 are provided on the outside of the enclosed cavity. One end of the air inlet pipe 200 is connected to the first cavity 800, and one end of the air outlet pipe 300 is connected to the aforementioned second cavity 900.

[0032] In the production of positive and negative electrode materials for lithium batteries, this application installs a compressor 113, connecting the air outlet duct 300 to the inlet of the compressor 113. Outside air enters the first chamber 800 through the air inlet duct 200. Air within the first chamber 800 passes through the filter layer 700 into the second chamber 900, and is then sent to the compressor 113 through the air outlet duct 300. Finally, the air is sent to the manufacturing process (sintering, air jet milling, and instrument power processes, etc.) via the compressor 113. In this process, the enclosed housing 100 and the filter layer 700 form a sealed filtration structure, effectively filtering metallic impurities from the air, ensuring the cleanliness of the air supplied to the compressor 113, and preventing the reduction of elemental metals at the negative electrode of the battery.

[0033] In some embodiments of this utility model, the enclosed box 100, the partition plate 600, the air inlet pipe 200 and the air outlet pipe 300 are all made of stainless steel.

[0034] In the prior art, the air inlet of some compressors 113 is connected to a housing, but the housing is mostly made of carbon steel. The carbon steel housing contains metal impurities such as manganese (Mn). The air will carry out the above-mentioned metal impurities (mainly manganese metal impurities). When the voltage of the battery formation stage reaches the oxidation-reduction potential of these metal elements, these metals will first be oxidized at the positive electrode and then reduced at the negative electrode. When the metal element at the negative electrode accumulates to a certain extent, the hard edges of the deposited metal will pierce the separator, causing the battery to self-discharge, which will have a fatal impact on the lithium-ion battery.

[0035] In the above embodiments, the enclosed box 100, the partition plate 600, the air inlet pipe 200 and the air outlet pipe 300 made of stainless steel have more stable structural properties, do not affect the cleanliness of the air, are beneficial to the production and processing of lithium batteries, and are more practical.

[0036] In some embodiments of this utility model, the filter layer 700 is an activated carbon layer.

[0037] In the above embodiments, the activated carbon layer can remove metallic impurities from the air and improve air cleanliness.

[0038] In some embodiments of this utility model, the number of the above-mentioned flow guide holes is two, and each of the above-mentioned flow guide holes is provided with the above-mentioned filter layer 700.

[0039] In the above embodiment, the number of guide holes is two, which can improve the air filtration efficiency. It should be noted that the number of guide holes is only one implementation method of this embodiment, and is not a limitation on the number of guide holes. Other numbers can be used in other embodiments.

[0040] In some embodiments of this utility model, an installation plate 400 is provided on the outer side of the enclosed box 100, and the installation plate 400 is provided with installation holes.

[0041] In the above embodiments, after bolts are inserted through the mounting holes, the enclosed enclosure 100 and the external structure (which can be a mounting bracket with holes or a plate with holes) can be detachably connected, thereby achieving the purpose of quick installation or disassembly of the enclosed enclosure 100.

[0042] Furthermore, there are two mounting plates 400, which are positioned on the same side of the enclosed enclosure 100 and are symmetrical about the center of the enclosure 100. Using two mounting plates 400 to install the enclosed enclosure 100 improves its stability.

[0043] In some embodiments of this utility model, the outer side of the enclosed box 100 is provided with a maintenance opening 111 for replacing or maintaining the filter layer 700, and the maintenance opening 111 is detachably provided with a sealing cover 500.

[0044] In the above embodiment, the sealing cover 500 is removed, and the first cavity 800 or the second cavity 900 is accessed through the maintenance opening 111 to replace the filter layer 700. The sealing cover 500 and the maintenance opening 111 are detachably connected by multiple screws. The screw connection method enables quick connection or disassembly of the sealing cover 500 and the maintenance opening 111, and the multiple screws improve the installation stability of the sealing cover 500.

[0045] Furthermore, the filter layer 700 and the flow guide holes are detachably connected by bolts or screws.

[0046] Example 2

[0047] Please refer to Figures 1-3 This application provides an air supply device, including the air inlet box as described above, and further including:

[0048] Compressor 113;

[0049] Connecting pipe 112, one end of which is connected to the inlet of the compressor 113, and the other end of which is connected to the outlet pipe 300 of the air inlet box.

[0050] The protective cover 110 covers the compressor 113, the connecting pipe 112 and the air inlet box. The protective cover 110 has two openings 111, which are respectively adapted to the installation of the air inlet pipe 200 and the air outlet structure of the compressor 113.

[0051] When the air supply device provided in this application is applied to lithium battery manufacturing, on the one hand, based on the cooperation of the air supply box and the compressor 113, it can filter the air (metal impurities) supplied to the compressor 113 and improve the cleanliness of the air; on the other hand, based on the protective cover 110 covering the compressor 113, the connecting pipe 112 and the air supply box, the air supply device is in a fully enclosed environment, which prevents metal impurities in the air from entering through the gap between the air supply box and the connecting pipe 112 or the gap between the connecting pipe 112 and the compressor 113, further ensuring the cleanliness of the air and making it more practical.

[0052] It is worth noting that after the integrated structure consisting of compressor 113, connecting pipe 112 and air inlet box is installed on the external structure (which can be a perforated mounting bracket or a perforated plate), the protective cover 110 is placed on the integrated structure.

[0053] In some embodiments of this utility model, the protective cover 110 is made of stainless steel.

[0054] In the above embodiments, the protective cover 110 made of stainless steel has a more stable structure, does not affect the cleanliness of the air, is beneficial to the production and processing of lithium batteries, and is more practical.

[0055] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An air inlet box for lithium battery manufacturing, characterized in that, include: Enclosed enclosure (100); A partition plate (600) is disposed inside the closed box (100) and divides the inner cavity of the closed box (100) into an independent first cavity (800) and a second cavity (900). The partition plate (600) is provided with a flow guide hole that connects the first cavity (800) and the second cavity (900). The flow guide hole is provided with a filter layer (700) for filtering metal impurities. An air inlet duct (200) is disposed outside the enclosed housing (100), and one end of the air inlet duct (200) is connected to the first cavity (800); and An air outlet duct (300) is provided on the outside of the enclosed box (100), and one end of the air outlet duct (300) is connected to the second cavity (900).

2. The air inlet box for lithium battery manufacturing according to claim 1, characterized in that, The enclosed enclosure (100), the partition plate (600), the air inlet pipe (200), and the air outlet pipe (300) are all made of stainless steel.

3. The air inlet box for lithium battery manufacturing according to claim 1, characterized in that, The filter layer (700) is an activated carbon layer.

4. The air inlet box for lithium battery manufacturing according to claim 1, characterized in that, The number of flow guide holes is two, and each of the flow guide holes is provided with the filter layer (700).

5. The air inlet box for lithium battery manufacturing according to claim 1, characterized in that, An installation plate (400) is provided on the outside of the enclosed box (100), and the installation plate (400) is provided with installation holes.

6. The air inlet box for lithium battery manufacturing according to claim 1, characterized in that, The outer side of the enclosed housing (100) is provided with a maintenance opening (111) for replacing or maintaining the filter layer (700), and the maintenance opening (111) is detachably provided with a sealing cover (500).

7. An air supply device, comprising an air inlet box as described in any one of claims 1-6, characterized in that, Also includes: Compressor (113); A connecting pipe (112) is provided, one end of which is connected to the inlet of the compressor (113), and the other end of which is connected to the outlet pipe (300) of the air inlet box. A protective cover (110) is provided, which covers the compressor (113), the connecting pipe (112) and the air inlet box. The protective cover (110) has two openings (111), which are respectively adapted to the installation of the air inlet pipe (200) and the air outlet structure of the compressor (113).

8. The air supply device according to claim 7, characterized in that, The protective cover (110) is made of stainless steel.

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