Cooling device

Abstract

The utility model relates to the technical field of battery production, and discloses a cooling device. The cooling device comprises a cooling pipeline, a filtering assembly and a flow stabilizing assembly, wherein the cooling pipeline is used for introducing cooling gas; the filtering assembly is arranged on the cooling pipeline; the flow stabilizing assembly is arranged at the gas outlet end of the cooling pipeline and can reduce the flow speed of the cooling gas conveyed through the cooling pipeline. Based on the cooling device provided by the utility model, cooling gas can be provided to a rubberizing position when the automatic line is shut down, so that the phenomenon of gluing caused by long-term heating of a position, corresponding to a battery cell, of an adhesive tape is avoided, the waste of materials is avoided, the influence on the working efficiency is avoided, manual participation is not needed, the labor cost is reduced, and the production efficiency is improved. The conveyed cooling gas does not contain impurities, the production requirement of the secondary battery is met, under the action of the flow stabilizing assembly, the cooling gas stably flows to the adhesive tape, adhesive tape positioning is not affected, and the adhesive pasting effect is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery production technical field, specifically to a cooling device. BACKGROUND

[0002] Lithium battery is a kind of battery by lithium metal or lithium compound as positive / negative electrode material, using non-aqueous liquid electrolyte or gel polymer electrolyte, with high energy density, lightweight, fast charge and discharge and long life characteristics, widely used in portable electronic devices, electric vehicles, energy storage systems, aerospace field and medical equipment and other fields. With the rapid development of lithium battery, the safety performance of product becomes the most important performance of use end, and the material performance needed in manufacturing process develops synchronously.

[0003] In lithium ion battery production, high-capacity high-energy battery is usually internally connected in series by multiple-ear butterfly welding multiple roll cores, and after welding, high-temperature protective tape is pasted to realize insulation protection (welding mark protective tape is pasted at the welding position of the tab and the connecting piece and the welding position of the connecting piece and the cover plate) to prevent the welding point from piercing the diaphragm, ensure that the tab, connecting piece and roll core do not contact to cause safety risk and cause roll core short circuit. Among them, the welding mark protective tape is a kind of pressure sensitive tape with special functional characteristics, which has certain initial adhesion, holding adhesion, temperature resistance and chemical corrosion resistance. When the tape contacts with the current collector or the connecting piece, the adhesive and the current collector or the connecting piece are combined by "intermolecular force", and the adhesive can fill the concave-convex surface of the solid to achieve the purpose of adhesion. If the welding mark protective tape pasting occurs abnormally (welding mark protective tape pasting cannot completely cover the current collector or the connecting piece) during production, the insulation protection function will fail, causing internal short circuit of the product, causing internal thermal runaway of the product, rapid increase of chemical reaction in the battery, resulting in temperature rise and pressure increase of the battery, and finally the battery may rupture or explode.

[0004] At present, the assembly line in the production process is a full-automatic line, and the surface temperature of the battery cell is maintained at 30-40 DEG C after hot pressing, and the temperature of the tab and the connecting piece is 30-50 DEG C after ultrasonic welding. Since the welding mark protective tape used at present is high-temperature resistant PET tape, which is composed of base material and adhesive, the base material is PET (Chinese name is polyethylene terephthalate, abbreviated as polyester), and the adhesive is organic silicon pressure sensitive adhesive. The adhesive force is affected by temperature and standing time. If the automatic line stops, the adhesive position will be heated and the standing time will increase due to the influence of the temperature of the battery cell, resulting in adhesive, and then the adhesive device cannot send adhesive smoothly, which needs manual replacement of adhesive tape, resulting in increase of labor cost, material cost and time cost. UTILITY MODEL CONTENTS

[0005] To solve the above technical problems or at least partially solve the above technical problems, the utility model provides a cooling device.

[0006] The utility model provides a cooling device, including:

[0007] Cooling pipeline for introducing cooling gas;

[0008] Filter assembly is arranged on cooling pipeline, and

[0009] Steady flow subassembly is arranged at the gas outlet end of cooling pipeline, and the steady flow subassembly is arranged to reduce the flow rate of cooling gas conveyed through cooling pipeline, so that cooling gas flows to target position smoothly.

[0010] Optionally, the steady flow subassembly includes a filter arranged at the gas outlet end of the cooling pipeline, and the filter is provided with filter holes.

[0011] Optionally, the filter is a plurality of filter holes, and the plurality of filter holes are arranged along the extension direction of the cooling pipeline, and the distance between adjacent two filter holes is 3-10mm.

[0012] Optionally, the filter holes are uniformly arranged on the filter, the pore size of the filter holes is 10-100nm, and / or the hole spacing of the filter holes is 1-3mm.

[0013] Optionally, the cooling pipeline includes a pipeline body and a reducing pipe arranged at the gas outlet end of the pipeline body, the reducing pipe includes a necked section in communication with the gas outlet end of the pipeline body, a flat section in communication with the outlet end of the necked section and an expanded section in communication with the outlet end of the flat section, and the steady flow subassembly is arranged at the flat section.

[0014] Optionally, the diameter of the necked section away from the flat section is 10-30mm, the diameter of the flat section is 5-10mm, and the diameter of the expanded section away from the flat section is 10-20mm.

[0015] Optionally, the filter assembly includes a first filter piece, the first filter piece includes a filter layer group arranged at the gas outlet end of the cooling pipeline, and the filter layer group is located on the side of the steady flow subassembly away from the gas outlet of the cooling pipeline.

[0016] Optionally, the first filter piece includes one or more filter layer groups, and the filter layer group has a multi-layer structure of 3-5 layers.

[0017] Optionally, the gas inlet end of the cooling pipeline is connected with a compressed gas delivery pipeline, and the filter assembly further comprises a second filter element, the second filter element comprising an oil-water separator arranged on the compressed gas delivery pipeline.

[0018] Optionally, the pipeline body comprises a delivery pipeline for introducing cooling gas and a flexible pipeline in communication with the output end of the delivery pipeline, and the variable-diameter pipe is arranged at the end of the flexible pipeline.

[0019] Optionally, the cooling pipeline is used for introducing compressed gas, and the cooling pipeline is provided with an air cooler for refrigerating the compressed gas.

[0020] And / or, the cooling pipeline is provided with a flow control valve for adjusting the flow rate of the cooling gas.

[0021] The technical scheme provided by the utility model has the following advantages compared with the prior art:

[0022] Based on the cooling device provided by the utility model, cooling gas can be provided towards the rubber bonding position when the automatic line is stopped, specifically, cooling gas is provided towards the rubber belt, and the inherent characteristics of the rubber belt will not cause frequent alarms of the equipment and manual rubber replacement when the automatic line is stopped. By using the cooling device provided by the utility model, the phenomenon that the rubber belt and the corresponding position of the battery are heated for a long time to cause glue sticking can be avoided, the normal use of the rubber belt is avoided, and the waste of materials is avoided, the smooth rubber feeding after the automatic line is started is ensured, the working efficiency is avoided, manual participation in rubber replacement is not required, the labor cost is reduced, in addition, the cooling gas delivered does not contain impurities, meets the production requirements of secondary batteries, and under the action of the current stabilizing assembly, the cooling gas flows stably to the rubber belt, the positioning of the rubber belt is not affected, and the rubber bonding effect is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0023] The drawings incorporated into the specification and forming a part thereof show, in accordance with the embodiments of the utility model, and together with the specification, serve to explain the principle of the utility model.

[0024] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced, and obviously, other drawings can be obtained by those skilled in the art without creative labor.

[0025] Figure 1 The structure diagram of the cooling device described in the utility model embodiments is shown in the figure.

[0026] Figure 2 The structure diagram of the cooling device described in the utility model embodiments is shown in the figure. Figure 1 The local enlarged view of A in the figure.

[0027] Figure 3 A structure schematic view of the variable-diameter pipe according to the embodiment of the present application is shown in the figure;

[0028] Figure 4 A structure schematic view of the inside of the variable-diameter pipe according to the embodiment of the present application is shown in the figure;

[0029] Figure 5 A structure schematic view of the filter layer group according to the embodiment of the present application is shown in the figure.

[0030] Explanation of reference signs

[0031] 1, cooling pipeline; 11, conveying pipeline; 12, flexible pipeline; 13, cold air gun; 14, flow control valve; 15, variable-diameter pipe; 151, necking section; 152, flat section; 153, flaring section; 2, filter assembly; 21, first filter; 211, filter layer group; 2111, surface adsorption layer; 2112, dense layer; 2113, reinforcing layer; 2114, support layer; 2115, back purification layer; 3, flow stabilizing assembly; 31, filter; 4, second filter; 41, oil-water separator; 42, compressed gas conveying pipeline. DETAILED DESCRIPTION

[0032] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the following will further describe the scheme of the present application. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0033] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein; obviously, the embodiments in the description are only part of the embodiments of the present application, not all the embodiments.

[0034] Combined with Figure 1 and Figure 2 As shown in the figure, the cooling device provided by the embodiment of the present application comprises a cooling pipeline 1, a filter assembly 2 and a flow stabilizing assembly 3.

[0035] The cooling pipeline 1 is used for introducing cooling gas, wherein the temperature of the cooling gas can be designed according to actual requirements, and the gas supply mode of the cooling gas is not limited. For example, the cooling gas can be directly conveyed to the cooling pipeline 1 through a cold air device, or compressed gas can be conveyed to the cooling pipeline 1 through a compressed gas conveying device, and then the temperature of the compressed gas is adjusted to a preset temperature through a cold air manufacturing assembly on the cooling pipeline 1, which is not limited, and can be designed according to actual requirements.

[0036] The filter assembly 2 is arranged on the cooling pipeline 1, and the filter assembly 2 can filter impurities and liquid in the cooling gas. The arrangement position and arrangement mode of the filter assembly 2 are not limited, as long as the impurities and liquid in the cooling gas can be removed, wherein the impurities include dust, foreign matters and the like, and the liquid includes water, oily pollutants and the like, so that the cooling gas acting on the target position is free of impurities, and the target position is prevented from being polluted.

[0037] The flow stabilizing assembly 3 is arranged at the gas outlet end of the cooling pipeline 1, and the flow stabilizing assembly 3 is arranged to reduce the flow rate of the cooling gas conveyed through the cooling pipeline 1, so that the cooling gas flows to the target position stably. The target position can be the position where the adhesive tape corresponds to the battery cell when the automatic line stops, so that the adhesive tape at the position is prevented from being glued for a long time in a high-temperature environment when the production line stops, and the normal use of the adhesive tape and the normal operation of the production line are ensured.

[0038] The cooling device provided by the utility model can provide cooling gas to the position where the adhesive tape is attached when the automatic line stops, specifically, cooling gas is provided to the adhesive tape, and the adhesive tape will not cause frequent alarms of the equipment and manual replacement of the adhesive tape due to the inherent properties of the adhesive tape when the automatic line stops. The cooling device provided by the utility model can prevent the position where the adhesive tape corresponds to the battery cell from being heated for a long time to cause the adhesive tape to be glued, avoid affecting the normal use of the adhesive tape, and thus avoid wasting materials, slow down the action time of the adhesive, ensure smooth feeding of the adhesive tape after the automatic line starts, avoid affecting the work efficiency, and do not require manual replacement of the adhesive tape, thereby reducing labor costs. In addition, the conveyed cooling gas is free of impurities, meets the production requirements of secondary batteries, and flows to the adhesive tape stably under the action of the flow stabilizing assembly 3, does not affect the positioning of the adhesive tape, and ensures the adhesive effect.

[0039] In some embodiments, the flow stabilizing assembly 3 includes a filter 31 arranged at the gas outlet end of the cooling pipeline 1, and the filter 31 is provided with filter holes. Specifically, the filter 31 is arranged inside the gas outlet end of the cooling pipeline 1.

[0040] In this design, the filter 31 can further filter the impurities remaining in the cooling gas, and the filter 31 can be used as a wind screen to reduce the flow rate of the cooling gas.

[0041] In some embodiments, the filter 31 is a plurality of filters, and the plurality of filters 31 are two or more, preferably three, arranged in sequence along the extension direction of the cooling pipeline 1, and the distance between adjacent two filters 31 is 3-10 mm.

[0042] In this design, the plurality of filters 31 can ensure the filtering effect of the impurities and increase the wind blocking effect, and the number of the filters 31 can be adjusted according to the requirements, so that the cooling gas is conveyed stably.

[0043] In some embodiments, the filter holes are uniformly arranged on the filter 31, the filter holes have a pore size of 10-100 nm, and the filter holes have a pore spacing of 1-3 mm. Either the filter hole pore size or the filter hole pore spacing satisfies the above numerical range, and of course, both satisfy the above numerical range to obtain a more ideal steady flow effect.

[0044] The filter 31 with such a size can ensure the filtering effect and the wind blocking effect, the number and pore size parameters of the filter 31 can be designed according to actual needs, the cooling gas outflow is ensured to be gentle, and the direction of the adhesive tape is not deviated to affect the bonding effect.

[0045] In some embodiments, the filter 31 can use a ceramic filter, including ceramic, corundum, silicon carbide, corundum sand, porcelain sand, and the like, which can be designed according to actual needs.

[0046] In some embodiments, in combination with the figures shown in Figure 3 and Figure 4 The cooling pipeline 1 includes a pipeline body and a reducing pipe 15 arranged at the air outlet end of the pipeline body, the reducing pipe 15 includes a necked section 151 in communication with the air outlet end of the pipeline body, a flat section 152 in communication with the outlet end of the necked section 151, and an expanded section 153 in communication with the outlet end of the flat section 152; the flow stabilizing assembly 3 is arranged at the flat section 152 to ensure the wind blocking effect. The diameter of the end of the necked section 151 away from the flat section 152 is 10-30 mm, the diameter of the flat section 152 is 5-10 mm, and the diameter of the end of the expanded section 153 away from the flat section 152 is 10-20 mm.

[0047] The reducing pipe 15 with such a design can adjust the wind speed through the reduction and expansion of the pipe diameter, and then cooperate with the flow stabilizing assembly 3 to ensure that the cooling gas is smoothly delivered to the target position.

[0048] In some embodiments, as shown in Figure 4 The filter assembly 2 includes a first filter 21, the first filter 21 includes a filter layer group 211 arranged at the air outlet end of the cooling pipeline 1, and the filter layer group 211 is located at the side of the flow stabilizing assembly 3 away from the air outlet of the cooling pipeline 1.

[0049] In this design, the filter layer group 211 arranged at the air outlet end of the cooling pipeline 1 can effectively filter out impurities in the cooling gas to ensure the cleanliness of the delivered cooling gas. The impurities at this point include dust and foreign matter, etc.

[0050] In some embodiments, the first filter 21 comprises one or more filter layer groups 211, and the filter layer group 211 has a multi-layer structure of 3-5 layers. That is, the number of filter layer groups 211 and the number of multi-layer structures in the filter layer group 211 in the first filter 21 can be designed according to actual needs to meet the filtering and wind resistance requirements.

[0051] In some embodiments, as shown in Figure 5 The filter layer group 211 comprises, in sequence along the direction towards the air outlet of the cooling pipeline 1, a surface adsorption layer 2111, a dense layer 2112, a reinforcing layer 2113, a support layer 2114, and a back purification layer 2115. Specifically, the surface adsorption layer 2111 is arranged on the surface of the dense layer 2112, the dense layer 2112 is arranged between the surface adsorption layer 2111 and the reinforcing layer 2113, the reinforcing layer 2113 is arranged between the dense layer 2112 and the support layer 2114, the support layer 2114 is arranged between the reinforcing layer 2113 and the back purification layer 2115, and the back purification layer 2115 is arranged on the back of the support layer 2114. The filter layer group 211 is arranged in the necked section 151.

[0052] In this design, the filter layer group 211 is arranged in the necked section 151, so that the filter layer group 211 also has a necked structure, and the filter layer group 211 adopts a multi-layer structure design, thereby making the filter layer group 211 adopt a gradient filter material structure, which can reduce the flow rate of the cooling gas passing through the filter layer group 211 while ensuring the impurity filtering effect, and facilitate the control of the gas flow rate.

[0053] In some embodiments, the surface adsorption layer 2111 is made of nanoscale fiber material. The nanoscale fiber material refers to a linear material with a certain length-diameter ratio, which has a nanometer scale diameter and a large length. In addition, a fiber in which a nanoparticle is filled into an ordinary fiber to modify it is also called a nanoscale fiber material, which is simply referred to as a nanofiber.

[0054] In some embodiments, the dense layer 2112 is made of polytetrafluoroethylene fiber and profiled fiber which are twisted with each other. The polytetrafluoroethylene fiber is a high molecular compound formed by polymerization of tetrafluoroethylene, which has excellent chemical stability, corrosion resistance, sealing property, high lubrication and non-stickiness, electrical insulation, and good aging resistance. The profiled fiber refers to a chemical fiber with a special cross-sectional shape spun through a certain geometric shape (non-circular) spinneret hole.

[0055] In some embodiments, the reinforcing layer 2113 is a base cloth layer, and the reinforcing layer 2113 is formed by interlacing fiber material in the warp and weft directions. The fiber material is preferably a fiber with a strength greater than 17.6 cN / dtex and an elastic modulus above 440 cN / dtex. The fiber material formed by interlacing in the warp and weft directions can improve the mechanical properties in the longitudinal and lateral directions.

[0056] In some embodiments, the support layer 2114 is made of carbon fibers or nanocellulose-based adsorption materials with adsorption effect. The carbon fiber is a new type of fiber material with carbon content of more than 95%, high strength and high modulus. The nanocellulose-based adsorption material is a large class of cellulose materials with microfiber units with a diameter of nanometers (2-100 nm).

[0057] In some embodiments, the back purification layer 2115 is made of an adsorption layer containing nanomaterials, which is used for re-adsorption of dust leakage during the dust removal process.

[0058] In some embodiments, as shown in Figure 1 The inlet end of the cooling pipeline 1 is connected with a compressed gas delivery pipeline 42, and the filter assembly 2 comprises a second filter 4, and the second filter 4 comprises an oil-water separator 41 arranged on the compressed gas delivery pipeline 42. The oil-water separator 41 is a conventional component for separating oily pollutants and water from the gas. The separation methods of the oil-water separator 41 mainly include physical separation, chemical separation, and electrostatic separation, which are conventional technologies in the field, and the structure and working principle of the oil-water separator 41 are not described in detail here.

[0059] In this design, the dust, foreign matter, water, and oily pollutants in the cooling gas can be filtered by the oil-water separator 41 to ensure the purity of the cooling gas.

[0060] In some embodiments, the pipeline body comprises a delivery pipeline 11 for introducing cooling gas and a flexible pipeline 12 in communication with the output end of the delivery pipeline 11. A reducing pipe 15 is arranged at the end of the flexible pipeline 12. The flexible pipeline 12 extends the gas outlet end of the reducing pipe 15 to the target position, and the gas outlet of the flexible pipeline 12 can be limited by bolts or other fixing members. The flexible pipeline 12 can be a bamboo joint pipe, which can be selected according to actual needs.

[0061] In this design, the delivery pipeline 11 can adopt a hard pipeline structure to facilitate the arrangement of the pipeline and make the line more orderly. The design of the flexible pipeline 12 can extend the gas outlet of the entire cooling pipeline 1 to the target position to facilitate the adjustment of the gas outlet position and direction of the cooling pipeline 1.

[0062] In some embodiments, the cooling pipeline 1 is used to introduce compressed gas, and the cooling pipeline 1 is provided with a cold air gun 13 for refrigerating the compressed gas. The cold air gun 13 is a conventional component that can reduce the temperature of the compressed gas using compressed gas as a medium, and the structure and working principle of the cold air gun 13 are not described in detail here.

[0063] In this design, the compressed gas is introduced first and then the refrigeration is performed, which facilitates the control of the gas temperature, avoids the design of complex cooling equipment, and reduces the cost.

[0064] In some embodiments, the oil-water separator 41 is arranged on the side of the cooling gun 13 away from the first filter 21, so that the compressed gas before entering the cooling gun 13 is treated by the oil-water separator 41, avoiding impurities and liquid from blocking and polluting the cooling gun 13, and ensuring the service life of the cooling gun 13.

[0065] In some embodiments, the cooling device is combined with Figure 1 and Figure 2 As shown in the figures, the cooling pipeline 1 is provided with a flow control valve 14 for adjusting the flow rate of the cooling gas. The flow control valve 14 is arranged on the side of the first filter 21 and the flow stabilizing assembly 3 away from the gas outlet end of the cooling pipeline 1.

[0066] In this design, the flow rate of the cooling gas flowing to the gas outlet end of the cooling pipeline 1 can be controlled by the flow control valve 14, so that the flow rate of the cooling gas before entering the first filter 21 and the flow stabilizing assembly 3 can be controlled within a certain range, to ensure that the cooling gas after passing through the first filter 21 and the flow stabilizing assembly 3 is smoothly delivered, and the flow rate of the cooling gas at the outlet of the cooling pipeline 1 is controlled. Specifically, after the cooling gas with adjusted flow rate by the flow control valve 14 enters the filter layer group 211, dust and foreign matter are filtered out, and then the filtered gas passes through the filter 31, so that the air outflow is smooth.

[0067] Based on the cooling device provided in the present application, the introduced compressed air is removed of large dust, foreign matter, water and oily pollutants by the oil-water separator 41, and then the compressed air temperature is reduced by the cooling gun 13 to obtain cooling gas, and then the cooling gas is filtered again by the filter layer group 211 to remove dust and the like in the cooling gas, and finally the air outflow is smooth by the filter 31, without affecting the stretching and cutting of the adhesive tape, and the air outlet is windless.

[0068] It should be noted that, in the present document, relational terms such as“first” and“second”, and the like, are used solely to distinguish one entity or action from another entity or action, without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms“comprises”,“comprising”, or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by“comprises a...” does not, without more constraints, preclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0069] The foregoing merely illustrates the principles of the application and various modifications can be devised by those skilled in the art without departing from the spirit or scope of the application. The present application is thus not intended to be limited to the particular embodiments described herein, but rather only by the scope of the appended claims, and their equivalents.

Claims

1. Cooling device, characterized in that The application relates to a cooling pipeline (1) for introducing cooling gas, a filter assembly (2) arranged on the cooling pipeline (1), and a flow stabilizing assembly (3) arranged at the gas outlet end of the cooling pipeline (1). The flow stabilizing assembly (3) comprises filters (31) arranged at the gas outlet end of the cooling pipeline (1), and the filters (31) are provided with filter holes. The filters (31) are arranged in sequence along the extension direction of the cooling pipeline (1), and the distance between two adjacent filters (31) is 3-10 mm. The filter holes are uniformly arranged on the filters (31), the filter hole diameter is 10-100 nm, and / or the filter hole spacing is 1-3 mm. The cooling pipeline (1) comprises a pipeline body and a reducing pipe (15) arranged at the gas outlet end of the pipeline body, the reducing pipe (15) comprises a necked section (151) in communication with the gas outlet end of the pipeline body, a flat section (152) in communication with the outlet end of the necked section (151), and an expanded section (153) in communication with the outlet end of the flat section (152), and the flow stabilizing assembly (3) is arranged at the flat section (152).

2. Cooling device according to claim 1, characterized in that The diameter of the end of the necked section (151) away from the flat section (152) is 10-30 mm, the diameter of the flat section (152) is 5-10 mm, and the diameter of the end of the expanded section (153) away from the flat section (152) is 10-20 mm.

3. Cooling device according to claim 2, characterized in that The filter assembly (2) comprises a first filter (21) comprising a filter layer group (211) arranged at the gas outlet end of the cooling pipeline (1), and the filter layer group (211) is located on the side of the flow stabilizing assembly (3) away from the gas outlet of the cooling pipeline (1).

4. Cooling device according to claim 2 or 3, characterized in that The first filter (21) comprises one or more filter layer groups (211), and the filter layer group (211) has a multi-layer structure with 3-5 layers.

5. The cooling device of claim 1, wherein The gas inlet end of the cooling pipeline (1) is connected with a compressed gas conveying pipeline (42), the filter assembly (2) comprises a second filter (4), and the second filter (4) comprises an oil-water separator (41) arranged on the compressed gas conveying pipeline (42).

6. Cooling device according to claim 5, characterized in that The pipeline body comprises a conveying pipeline (11) for introducing cooling gas and a flexible pipeline (12) in communication with the output end of the conveying pipeline (11), and the reducing pipe (15) is arranged at the end of the flexible pipeline (12).

7. The cooling device of claim 1, wherein The cooling pipeline (1) is used for introducing compressed gas, and a cold air gun (13) for refrigerating the compressed gas is arranged on the cooling pipeline (1).

8. Cooling device according to claim 7, characterized in that And / or, a flow control valve (14) for adjusting the flow rate of the cooling gas is arranged on the cooling pipeline (1).

9. The cooling device of claim 1, wherein, ​ 10. The cooling device of claim 5, wherein, ​ 11. The cooling device of claim 1, wherein, ​ ​

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