Gas-liquid filter and gas-liquid filtering method

Abstract

The application relates to the technical field of gas-liquid separation, and particularly provides a gas-liquid filter and a gas-liquid filtering method, which comprise a shell, a filter core and a buffer piece, the shell is provided with a first through hole, a shell cavity and a second through hole, the first through hole is communicated with the shell cavity; the filter core is arranged in the shell cavity, the filter core is communicated with the second through hole, and the filter core is used for filtering and separating a target fluid; wherein the target fluid enters the shell cavity from the first through hole; the buffer piece is connected with the filter core, the buffer piece is provided with a buffer part, the buffer part is arranged opposite to the first through hole, and the buffer part is used for providing buffering for the target fluid so as to reduce the speed of the target fluid. The application has high filtering and separating precision, reduces electrolyte loss, and saves production cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas-liquid separation, in particular to a gas-liquid filter and a gas-liquid filtering method. BACKGROUND

[0002] Lithium batteries are widely used due to their high energy density, long cycle life, no memory effect and other advantages. In the production process of lithium batteries, the lithium batteries need to be charged and formed. In the formation process, the reaction of the materials inside the battery will generate gas. In order to prevent the accumulation of gas in the battery from causing pressure increase, a negative pressure device is usually provided to remove the gas.

[0003] Since there is not only gas but also electrolyte inside the battery, when the gas is removed, a part of the electrolyte will be removed together with the gas. Therefore, in the prior art, a filter is usually provided on the pipeline connecting the battery liquid inlet and the negative pressure device to realize the filtering and separation of the fluid. Among them, the gas is removed, and the electrolyte is separated out, returned or enters the liquid storage device.

[0004] However, the flow speed of the fluid removed by the negative pressure device is very fast, which makes it difficult for the existing filter to effectively realize the filtration of high flow speed, and the filtration and separation precision of the fluid is low. SUMMARY

[0005] The gas-liquid filter and the gas-liquid filtering method provided by the embodiments of the present application at least solve the problem of low filtration and separation precision of the existing filter, have high filtration and separation precision, reduce the loss of electrolyte, and save production cost.

[0006] In a first aspect, the present application provides a gas-liquid filter, comprising a shell, the shell is provided with a first through hole, a shell cavity and a second through hole, the first through hole communicates with the shell cavity; a filter core, the filter core is arranged in the shell cavity, the filter core communicates with the second through hole, and the filter core is used for filtering and separating a target fluid; wherein the target fluid enters the shell cavity from the first through hole; and a buffer member, the buffer member is connected with the filter core, the buffer member is provided with a buffer part, the buffer part is arranged opposite to the first through hole, and the buffer part is used for providing buffer for the target fluid to reduce the speed of the target fluid.

[0007] In an embodiment of the present application, the buffer member is provided with a buffer surface, the buffer surface is arranged opposite to and spaced apart from the first through hole; the buffer part is arranged as a backflush cavity, the backflush cavity is arranged on the buffer surface, and the backflush cavity is recessed along a first direction.

[0008] In an embodiment of the present application, the first through hole comprises a first hole section and a second hole section, the first hole section and the second hole section are sequentially arranged along a first direction, the first hole section is configured to communicate with a first target piece; the second hole section respectively communicates the first hole section and the shell cavity, and a hole wall of the second hole section is arranged obliquely so that a hole inner profile area of the second hole section gradually decreases along a direction opposite to the first direction; wherein the first target piece is used to provide the target fluid.

[0009] In an embodiment of the present application, a first connecting joint connects the shell, the first connecting joint is provided with a first connecting channel, the first connecting channel comprises a first channel section and a second channel section, the first channel section is configured to communicate with a first target piece, and the second channel section respectively communicates the first channel section and the first through hole, and a first included angle is formed between an extension direction of the second channel section and an extension direction of the first channel section; or / and, a second connecting joint connects the shell, the second connecting joint is provided with a second connecting channel, the second connecting channel comprises a third channel section and a fourth channel section, the third channel section is configured to communicate with a second target piece, and the fourth channel section respectively communicates the third channel section and the second through hole, and a second included angle is formed between an extension direction of the fourth channel section and an extension direction of the third channel section.

[0010] In an embodiment of the present application, the filter element comprises a plurality of filter cartridges, the plurality of filter cartridges are coaxially arranged, each of the filter cartridges is provided with a filter hole, the filter hole penetrates a cartridge wall of the filter cartridge, and each of the filter cartridges has a separation cavity between adjacent two filter cartridges; the second through hole communicates a first filter cartridge, and the first filter cartridge is the innermost filter cartridge.

[0011] In an embodiment of the present application, each of the filter cartridges is provided with a plurality of filter holes, and the plurality of filter holes are uniformly distributed along a circumferential direction of the filter cartridge; or / and, the filter holes on adjacent two filter cartridges are arranged in a staggered manner; or / and, along a direction opposite to a second direction, the number of the filter holes on each of the filter cartridges decreases; or / and, along the second direction, a hole area of the filter holes on each of the filter cartridges decreases; wherein the second direction is a direction in which a cartridge wall of the filter cartridge faces a center of the filter cartridge.

[0012] In one embodiment of the present application, the filter core comprises a first cover and a second cover, the first cover and the second cover are sequentially and spaced apart in a first direction, the first cover and the second cover are both provided with a limiting groove, the two ends of the filter cartridge are respectively arranged in the corresponding limiting groove, and the filter cartridge is fixedly connected with the first cover and the second cover respectively; the first cover is connected with the buffer; the second cover is connected with the shell, and the second cover is provided with a third through hole, and the third through hole is communicated with the first filter cartridge and the second through hole respectively.

[0013] In one embodiment of the present application, the second cover is threadedly connected or / and welded connected with the shell.

[0014] In one embodiment of the present application, the first through hole is arranged below the second through hole.

[0015] In a second aspect, the present application further provides a gas-liquid filtering method based on the gas-liquid filter of any one of the above, comprising: receiving a target fluid through the first through hole; providing a buffer for the target fluid through the buffer part of the buffer when the target fluid enters the shell cavity, so as to reduce the speed of the target fluid; filtering the target fluid through the filter core to obtain a first filtered fluid, and the first filtered fluid is discharged from the shell cavity through the second through hole.

[0016] The above technical solution of the present application has the following beneficial effects compared with the prior art:

[0017] The gas-liquid filter of the present application is provided with a buffer for the filter core, and the buffer provides a buffer for the target fluid to reduce the speed of the target fluid. Correspondingly, the filter core can have more sufficient time to filter and separate, thereby improving the overall fluid filtering and separating precision. The gas-liquid filter of the present application is especially suitable for battery formation filtering, can effectively prevent the loss of electrolyte, save the cost of electrolyte, and reduce unnecessary waste. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other embodiments according to these drawings without creating any creative labor. In the drawings:

[0019] Figure 1 is a structure schematic view of the gas-liquid filter in the preferred embodiment of the present application.

[0020] Figure 2is a sectional structure schematic diagram of the gas-liquid filter in the preferred embodiment of the present application.

[0021] Figure 3 is a working principle schematic diagram of the gas-liquid filter in the preferred embodiment of the present application.

[0022] Figure 4 is a sectional structure schematic diagram of the buffer in the preferred embodiment of the present application.

[0023] Figure 5 is a sectional structure schematic diagram of the filter core in the preferred embodiment of the present application.

[0024] Figure 6 is a flow schematic diagram of the gas-liquid filtering method in the preferred embodiment of the present application.

[0025] In the above drawings, the following reference signs are included: D1, first direction; D2, second direction; 10, shell; 11, first shell cover; 111, first through hole; 1111, first hole section; 1112, second hole section; 12, shell main body; 121, shell cavity; 13, second shell cover; 131, second through hole; 20, filter core; 211, first filter cylinder; 212, second filter cylinder; 213, third filter cylinder; 214, filter hole; 215, separation cavity; 221, first cover body; 222, second cover body; 223, limiting groove; 224, third through hole; 30, buffer; 31, buffer part; 311, backflush cavity; 32, buffer surface; 40, first target part; 50, first connection joint; 51, first connection channel; 511, first channel section; 512, second channel section; 60, second connection joint; 61, second connection channel; 611, third channel section; 612, fourth channel section; 70, second target part. DETAILED DESCRIPTION

[0026] Embodiments of the present application will be described in more detail by referring to the attached drawings. Although certain embodiments of the present application are shown in the drawings, it is understood that the present application can be embodied in various forms and should not be interpreted as being limited to the embodiments set forth herein, but rather these embodiments are provided so that the present application can be more thoroughly and completely understood. It is understood that the drawings and embodiments of the present application are for exemplary purposes only and are not intended to limit the scope of protection of the present application.

[0027] Referring to Figure 1 and Figure 2 , the present application provides a gas-liquid filter, which comprises a shell 10, a filter core 20 and a buffer 30.

[0028] The shell 10 is used to arrange components and protect the internal components. Those skilled in the art can arrange the structure of the shell 10 according to actual needs, for example, the shell 10 is arranged as an integrated or split structure. Preferably, the shell 10 comprises a first shell cover 11, a shell body 12 and a second shell cover 13. The shell body 12 is arranged as a cylindrical structure, and the shell body 12 is hollow in the axial direction, and the first shell cover 11 and the second shell cover 13 are arranged at the two axial ends of the shell body 12, respectively. Preferably, after the assembly of the corresponding components is completed, the first shell cover 11, the shell body 12 and the second shell cover 13 are welded and connected to realize fixed assembly, so as to ensure sealed connection and high reliability.

[0029] Those skilled in the art can arrange the material of the shell 10 according to actual needs. Considering that the electrolyte has certain corrosiveness, preferably, the entire shell 10 is made of SUS304 stainless steel, which is corrosion-resistant.

[0030] The shell 10 is provided with a first through hole 111, a shell cavity 121 and a second through hole 131. The shell cavity 121 is used to accommodate corresponding components and fluids. The first through hole 111 communicates with the shell cavity 121, and when filtration is needed, the target fluid enters the shell cavity 121 from the first through hole 111. After the filtration is completed, the first filtered fluid obtained by filtration is discharged from the shell cavity 121 through the second through hole 131. In some cases, a second filtered fluid can also be obtained by filtration, and the second filtered fluid is discharged from the shell cavity 121 through the first through hole 111.

[0031] For example, the target fluid is a gas-liquid mixture, which includes electrolyte and gas generated by formation. The first filtered fluid is the filtered gas generated by formation, which is separated from the liquid and discharged from the shell cavity 121 through the second through hole 131 for collection and treatment, which is very environmentally friendly. The second filtered fluid is the electrolyte, which is discharged from the shell cavity 121 through the first through hole 111 and returned to the battery or the liquid storage device.

[0032] Taking the split shell 10 as an example, the first through hole 111 is arranged on the first shell cover 11, the shell cavity 121 is arranged in the shell body 12, and the second through hole 131 is arranged on the second shell cover 13.

[0033] The filter core 20 is used for filtering and separating the target fluid. The filter core 20 is arranged in the shell cavity 121, and the filter core 20 is communicated with the second through hole 131. After the target fluid enters the shell cavity 121 from the first through hole 111, the target fluid is filtered and separated by the filter core 20, and the separated fluid is obtained, which includes the first filtered fluid and the second filtered fluid. The first filtered fluid is discharged from the shell cavity 121 through the second through hole 131, and the second filtered fluid is discharged from the shell cavity 121 through the first through hole 111. Those skilled in the art can set the corresponding filter core 20 according to the actual needs to realize the filtering and separation of the fluid. Preferably, in order to facilitate the assembly and filtering of the filter core 20, the size of the filter core 20 is smaller than the size of the shell cavity 121.

[0034] The buffer 30 is a core component for improving the filtering and separating precision. The buffer 30 is connected with the filter core 20, and those skilled in the art can set the connection mode between the buffer 30 and the filter core 20 according to the actual needs, such as welding.

[0035] The buffer 30 is provided with a buffer part 31, and the buffer part 31 is arranged opposite to the first through hole 111. By arranging the buffer part 31 opposite to the first through hole 111, the target fluid can be processed by the buffer part 31 after the target fluid enters the shell cavity 121 from the first through hole 111, and the target fluid will not be missed.

[0036] The buffer part 31 is used for buffering the target fluid to reduce the speed of the target fluid. After the speed of the target fluid is reduced, the filter core 20 can fully realize filtering, and thus the fluid filtering and separating precision of the whole gas-liquid filter is improved. The problem of low fluid filtering and separating precision caused by high fluid pressure is effectively overcome, and the loss of electrolyte is effectively prevented, the cost of electrolyte is saved, and unnecessary waste is reduced.

[0037] Considering the fluid flow demand, the size of the buffer 30 can be set to be smaller than the size of the shell cavity 121, so that there is a gap between the buffer 30 and the cavity wall of the shell cavity 121, so that the fluid can pass through. Alternatively, a through hole is arranged on the buffer 30 to allow the fluid to pass through.

[0038] Those skilled in the art can set different buffers 30 according to the actual needs. For example, the buffer 30 is arranged as a buffer plate, and the plate surface of the buffer plate is circular. The filter core 20 is arranged in a cylindrical structure, the diameter of the circular end surface of the cylinder is smaller than the diameter of the circular plate surface of the buffer plate, and the buffer plate is arranged at one end of the filter core 20 in the axial direction. The circular end surface of the cylinder is projected on the circular plate surface of the buffer plate along the axial direction of the cylinder, and the buffer part 31 is the part not covered by the projection.

[0039] After the target fluid enters the shell cavity 121 from the first through hole 111, on the one hand, the target fluid will reduce the flow speed due to the impact of the buffer 30; on the other hand, due to the existence of the buffer part 31, the movement of the target fluid into the filter element 20 is blocked and needs to be bypassed. In combination of the two, the filter element 20 gets more sufficient time to filter and separate, thereby improving the fluid filtering and separating precision.

[0040] The gas-liquid filter provided by the application sets the buffer 30 for the filter element 20, and provides buffering for the target fluid through the buffer 30 to reduce the speed of the target fluid. Correspondingly, the filter element 20 can get more sufficient time to filter and separate, thereby improving the overall fluid filtering and separating precision. The gas-liquid filter provided by the application is especially suitable for battery formation filtering, can effectively prevent the loss of electrolyte, save the cost of electrolyte, and reduce unnecessary waste.

[0041] Referring to Figure 3 and 4 , in some embodiments of the gas-liquid filter provided by the application, the buffer 30 is provided with a buffer surface 32, and the buffer surface 32 is arranged in a spaced manner opposite to the first through hole 111. The interval is arranged between the buffer surface 32 and the first through hole 111, so as to pass the fluid to perform subsequent filtering or backflow. The buffer part 31 is arranged as a backflush cavity 311, the backflush cavity 311 is arranged on the buffer surface 32, and the backflush cavity 311 is recessed along the first direction D1. Preferably, the first direction D1 is parallel to the axial direction of the cylindrical shell body 12. Through the arrangement of the structure, on the one hand, the buffering effect can be enhanced.

[0042] When the target fluid enters the shell cavity 121 from the first through hole 111, the target fluid will flow into the backflush cavity 311, at this time, the flow speed of the target fluid will be reduced. At the same time, under the action of the negative pressure force of the negative pressure device, the target fluid will still move towards the filter element 20 and the second through hole 131. In order to achieve this purpose, the target fluid needs to move out of the backflush cavity 311 from the cavity wall of the backflush cavity 311, and this bypassing action further reduces the flow speed of the target fluid, and provides sufficient time for the filter element 20 to filter. Therefore, the fluid filtering and separating precision of the whole gas-liquid filter is improved. The problem that the fluid filtering and separating precision is low due to high fluid pressure is effectively overcome, taking battery formation as an example, the loss of electrolyte is effectively prevented, the cost of electrolyte is saved, and unnecessary waste is reduced.

[0043] Referring to Figure 2 and Figure 4 , in some embodiments of the gas-liquid filter provided by the application, the first through hole 111 includes a first hole section 1111 and a second hole section 1112, and the first hole section 1111 and the second hole section 1112 are arranged in sequence along the first direction D1.

[0044] The first hole section 1111 is configured to communicate with the first target piece 40. The first target piece 40 is configured to provide a target fluid. For example, the first target piece 40 is a battery to be formed. Those skilled in the art can set the connection mode between the two according to actual needs, for example, by connecting through a pipe body. Preferably, the first hole section 1111 is configured as a cylindrical hole section. Preferably, the inner contour area of the first hole section 1111 is smaller than the inner contour area of the backflush cavity 311.

[0045] The second hole section 1112 respectively communicates with the first hole section 1111 and the shell cavity 121. The hole wall of the second hole section 1112 is inclinedly arranged, so that the inner contour area of the second hole section 1112 gradually decreases in the opposite direction of the first direction D1. That is, the inner contour area of the second hole section 1112 at the joint with the first hole section 1111 is smaller than the inner contour area of the second hole section 1112 away from the first hole section 1111. By arranging the structure, the recovery efficiency of the electrolyte can be effectively improved during the formation of the battery, so that the electrolyte separated by filtration is returned with the help of the second hole section 1112. The loss of electrolyte is effectively prevented, the cost of electrolyte is saved, and unnecessary waste is reduced.

[0046] Those skilled in the art can set the hole wall of the second hole section 1112 according to actual needs, for example, set it as a straight inclined surface, a concave inclined surface or a convex inclined surface. Preferably, the inner contour area of the backflush cavity 311 is smaller than the inner contour area of the second hole section 1112.

[0047] Referring to Figure 2 As shown in the drawings, the gas-liquid filter of the present application further comprises a first connecting joint 50 connected to the shell 10 in some embodiments. Those skilled in the art can set the connection mode between the two according to actual needs, such as threaded connection or / and welding connection.

[0048] By arranging the first connecting joint 50, the pipe body can be conveniently matched and installed, so as to communicate with the first target piece 40. Those skilled in the art can set the connection structure of the first connecting joint 50 connected to the pipe body according to actual needs, such as setting threads, quick release structure, etc. The first connecting joint 50 is provided with a first connecting channel 51 to communicate with the first target piece 40. For example, the first connecting joint 50 is arranged as a welding joint.

[0049] Further, in some embodiments, the first connecting channel 51 comprises a first channel section 511 and a second channel section 512. The first channel section 511 is configured to communicate with the first target piece 40, and the second channel section 512 respectively communicates with the first channel section 511 and the first through hole 111. The first channel section 511 and the second channel section 512 have a first included angle a1 between the extension directions thereof.

[0050] By setting the first connecting channel 51 as a two-section structure with an included angle, the flow speed of the target fluid can be effectively reduced, providing sufficient time for the filter element 20 to filter. Therefore, the fluid filtering and separating precision of the entire gas-liquid filter is improved. The problem of low fluid filtering and separating precision caused by high fluid pressure is effectively overcome. Taking battery formation as an example, the loss of electrolyte is effectively prevented, the cost of electrolyte is saved, and unnecessary waste is reduced.

[0051] The first included angle a1 can be set according to actual needs, and is preferably ninety degrees.

[0052] Referring to Figure 2 The gas-liquid filter provided by the application further comprises a second connecting joint 60 connected to the housing 10 in some embodiments. The connecting mode of the two can be set by those skilled in the art according to actual needs, such as threaded connection or / and welding connection.

[0053] The second connecting joint 60 can be conveniently matched with a pipe body, the pipe body can be installed, and the second target piece 70 can be communicated. In this embodiment, the second target piece 70 is a manifold. After the gases generated by battery formation are collected through the manifold, the environment is very friendly and pollution is avoided. Those skilled in the art can set the connecting structure of the second connecting joint 60 connected to the pipe body according to actual needs, such as threaded connection, quick release structure, etc. The second connecting joint 60 is provided with a second connecting channel 61 to communicate the second target piece 70.

[0054] Further, in some embodiments, the second connecting channel 61 comprises a third channel section 611 and a fourth channel section 612. The third channel section 611 is configured to communicate with the second target piece 70, and the fourth channel section 612 respectively communicates the third channel section 611 and the second through hole 131. The extension direction of the fourth channel section 612 and the extension direction of the third channel section 611 have a second included angle a2.

[0055] By setting the second connecting channel 61 as a two-section structure with an included angle, the flow speed of the target fluid can be effectively reduced, providing sufficient time for the filter element 20 to filter. Therefore, the fluid filtering and separating precision of the entire gas-liquid filter is improved. The problem of low fluid filtering and separating precision caused by high fluid pressure is effectively overcome. Taking battery formation as an example, the loss of electrolyte is effectively prevented, the cost of electrolyte is saved, and unnecessary waste is reduced.

[0056] The second included angle a2 can be set according to actual needs, and is preferably ninety degrees.

[0057] Preferably, the first connecting joint 50 is provided as a welding joint, the first connecting channel 51 is provided as a straight one-piece structure, and the second connecting channel 61 of the second connecting joint 60 is provided as a two-piece structure with an included angle. Of course, the connecting channels of the first connecting joint 50 and the second connecting joint 60 can both be provided as two-piece structures with an included angle.

[0058] Referring to Figure 2 and Figure 5 As shown in the drawings, in some embodiments, the filter element 20 of the gas-liquid filter includes a plurality of filter cartridges arranged coaxially. Each filter cartridge is provided with a filter hole 214 penetrating the cartridge wall. Adjacent filter cartridges are separated by a separation cavity 215. The second through hole 131 communicates with the innermost filter cartridge. Through the above structure, the target fluid can be effectively filtered through the filter holes 214 on the filter cartridges and the separation cavities 215 between the cartridges. Preferably, the filter holes 214 are circular.

[0059] For example, three filter cartridges are provided. For the convenience of distinguishing the filter cartridges, the three filter cartridges are referred to as a first filter cartridge 211, a second filter cartridge 212, and a third filter cartridge 213 from inside to outside. That is, the first filter cartridge 211 is the innermost filter cartridge, the second through hole 131 communicates with the inside of the first filter cartridge 211, and the third filter cartridge 213 is the outermost filter cartridge.

[0060] When filtering, for example, battery, the target fluid first passes through the filter hole 214 of the third filter cartridge 213, enters the separation cavity 215 between the third filter cartridge 213 and the second filter cartridge 212, and is preliminarily filtered. Then, the remaining target fluid passes through the filter hole 214 of the second filter cartridge 212, enters the separation cavity 215 between the second filter cartridge 212 and the first filter cartridge 211, and at this time, most of the electrolyte in the target fluid has been filtered and separated. Finally, the remaining target fluid passes through the filter hole 214 of the first filter cartridge 211, enters the inside of the first filter cartridge 211, and the filtered gas is discharged from the second through hole 131 to the shell cavity 121.

[0061] Referring to Figure 5 As shown in the drawings, in some embodiments, each filter cartridge is provided with a plurality of filter holes 214 uniformly distributed along the circumference of the filter cartridge. Through the above structure, efficient filtering can be easily achieved, and the filter cartridges can be uniformly stressed, thereby prolonging the service life of the filter cartridges.

[0062] Referring to Figure 5As shown, the gas-liquid filter described in the present application, in some embodiments, the filter holes 214 on two adjacent filter cartridges are staggered. By setting this structure, when the target fluid flows in the filter cartridge, the target fluid is subjected to multiple blockades due to the winding of the filter cartridge, which can effectively improve the filtering and separating precision.

[0063] Referring to Figure 5 As shown, the gas-liquid filter described in the present application, in some embodiments, the number of filter holes 214 on each filter cartridge decreases in the opposite direction of the second direction D2. Wherein, the second direction D2 is the direction of the cartridge wall of the filter cartridge towards the center of the filter cartridge. By setting this structure, when the target fluid flows in the filter cartridge, the target fluid is subjected to multiple blockades due to the winding of the filter cartridge, which can effectively improve the filtering and separating precision.

[0064] Referring to Figure 5 As shown, the gas-liquid filter described in the present application, in some embodiments, the hole area of the filter holes 214 on each filter cartridge decreases along the second direction D2. By setting this structure, when the target fluid flows in the filter cartridge, the target fluid is subjected to multiple blockades due to the winding of the filter cartridge, which can effectively improve the filtering and separating precision.

[0065] Preferably, each filter cartridge is provided with the above four structures at the same time to achieve the best effect. For example, the first filter cartridge 211 is provided with 6 filter holes 214, and the hole diameter is 1.5 mm. The 6 filter holes 214 are divided into two groups, each group has 3 filter holes, and each filter hole 214 is uniformly distributed along the circumference of the first filter cartridge 211.

[0066] The second filter cartridge 212 is provided with 5 filter holes 214, and the hole diameter is 2 mm. The 5 filter holes 214 are divided into two groups, one group has 3 filter holes, and the other group has 2 filter holes, and each filter hole 214 is uniformly distributed along the circumference of the second filter cartridge 212, and each filter hole 214 on the second filter cartridge 212 is staggered with the filter hole 214 on the first filter cartridge 211.

[0067] The third filter cartridge 213 is provided with 3 filter holes 214, and the hole diameter is 3 mm, and each filter hole 214 is uniformly distributed along the circumference of the third filter cartridge 213, and each filter hole 214 on the third filter cartridge 213 is staggered with the filter hole 214 on the second filter cartridge 212.

[0068] Of course, in some embodiments, only one, two or three of the four structures can be selected for combination, which will not be described here.

[0069] Referring to Figure 5As shown, the gas-liquid filter provided by the present application, in some embodiments, the filter element 20 comprises a first cover 221 and a second cover 222, the first cover 221 and the second cover 222 are sequentially and spaced apart along the first direction D1. The first cover 221 and the second cover 222 are provided with a limiting groove 223, and the filter cartridge is arranged in the corresponding limiting groove 223 on the first cover 221 and the second cover 222 respectively, and the filter cartridge is fixedly connected with the first cover 221 and the second cover 222 respectively. By setting the limiting groove 223, on the one hand, the assembly of the filter cartridge and the cover can be facilitated, and the production efficiency can be improved; on the other hand, the connection effect and the sealing effect are also effectively enhanced, the service life of the device is prolonged, and the sealing connection reliability is improved.

[0070] The first cover 221 is connected with the buffer 30. Those skilled in the art can set the connection mode of the two according to actual needs, such as welding connection or integral molding.

[0071] The second cover 222 is connected with the shell 10. Those skilled in the art can set the connection mode of the two according to actual needs, for example, the second cover 222 is threadedly connected or welded with the shell 10. Preferably, on the basis of threadedly connecting the two, the two are welded and fixed. By setting this structure, on the one hand, the assembly can be facilitated, and the production efficiency can be improved; on the other hand, the connection effect and the sealing effect are also effectively enhanced, the service life of the device is prolonged, and the sealing connection reliability is improved.

[0072] The second cover 222 is provided with a third through hole 224, and the third through hole 224 is communicated with the first filter cartridge 211 and the second through hole 131 respectively, so as to facilitate the passage of gas.

[0073] Referring to Figure 3 As shown, the gas-liquid filter provided by the present application, in some embodiments, the first through hole 111 is arranged below the second through hole 131. It should be noted that below includes but is not limited to directly below or obliquely below. Taking the battery as an example, by setting this structure, on the one hand, the influence of gravity on the electrolyte is utilized, so that the electrolyte can flow back. On the other hand, the filtering and separating precision is also effectively improved, the loss of electrolyte is prevented, the cost of electrolyte is saved, and unnecessary waste is reduced.

[0074] Referring to Figure 6 As shown, the present application also provides a gas-liquid filtering method based on any one of the above embodiments. The gas-liquid filtering method comprises:

[0075] The target fluid is received through the first through hole 111. Exemplarily, a negative pressure device is arranged to suck the target fluid by negative pressure.

[0076] When the target fluid enters the shell cavity 121, the target fluid is buffered by the buffering part 31 of the buffer 30 to reduce the speed of the target fluid.

[0077] The target fluid is filtered by the filter element 20 to obtain a first filtered fluid, and the first filtered fluid is discharged from the shell cavity 121 through the second through hole 131. In some embodiments, the target fluid is further filtered to obtain a second filtered fluid, and the second filtered fluid is discharged from the shell cavity 121 through the first through hole 111.

[0078] Working principle:

[0079] After the pipelines are set, the negative pressure device is started. Under the action of the negative pressure device, the gas generated by the battery formation is sucked out. At the same time, the gas also carries a part of the electrolyte, and the target fluid includes the gas and the electrolyte. The target fluid flows along the pipe body, enters the first connecting channel 51 of the first connecting joint 50, and is reduced in speed at the first channel segment 511 and the second channel segment 512.

[0080] When the target fluid enters the shell cavity 121 through the first through hole 111, the target fluid will rush into the backflush cavity 311, and at this time the flow speed of the target fluid will be reduced. At the same time, under the action of the negative pressure force of the negative pressure device, the target fluid will still move towards the filter element 20 and the second through hole 131. In order to achieve this purpose, the target fluid needs to move out of the backflush cavity 311 from the cavity wall of the backflush cavity 311, and this circumferential action further reduces the flow speed of the target fluid, providing sufficient time for the filter element 20 to filter.

[0081] Subsequently, the target fluid passes through the filter element 20 and is filtered and separated from the electrolyte. Specifically, the target fluid first passes through the filter hole 214 of the third filter cylinder 213, enters the separation cavity 215 between the third filter cylinder 213 and the second filter cylinder 212, and is preliminarily filtered. Subsequently, the remaining target fluid passes through the filter hole 214 of the second filter cylinder 212, enters the separation cavity 215 between the second filter cylinder 212 and the first filter cylinder 211, and at this time the target fluid has been filtered and separated from most of the electrolyte. Finally, the remaining target fluid passes through the filter hole 214 of the first filter cylinder 211, enters the inside of the first filter cylinder 211, and the filtered gas is discharged from the shell cavity 121 through the second through hole 131; and the filtered and separated electrolyte will flow back along the hole wall of the second hole segment 1112.

[0082] It should be noted that the terms "comprises" and variations thereof do not specify the presence of features, integers, steps or components described therein. The terms "comprises" and variations thereof merely specify the presence of stated features, integers, steps or components, but do not preclude the presence or addition of one or more other features, integers, steps, components or groups thereof. The term "based on" is to be interpreted as "based, at least in part, on". The term "one embodiment" does not necessarily refer to the same embodiment. The term "another embodiment" does not necessarily refer to a different embodiment. The term "some embodiments" does not necessarily refer to the same embodiment or to different embodiments. The terms "a or an" and "one or more" are used interchangeably. The term "plurality" refers to two or more.

[0083] The various steps of the method embodiments provided by the embodiments of the present application can be performed in different orders and / or in parallel. Furthermore, the method embodiments can include additional steps and / or omit performing the steps shown. The scope of protection of the present application is not limited in this respect.

[0084] The word "comprising" and variations thereof do not necessarily have the same meaning, but include "including". The term "based on" is to be interpreted as "based, at least in part, on". The term "one embodiment" does not necessarily refer to the same embodiment. The term "another embodiment" does not necessarily refer to a different embodiment. The term "some embodiments" does not necessarily refer to the same embodiment or to different embodiments. The terms "a or an" and "one or more" are used interchangeably. The term "plurality" refers to two or more. The terms "at least one" and "one or more" have the same meaning. The terms "including" and / or "having" are used interchangeably. The term "including" does not exclude other elements or steps. The term "or" is used in its inclusive sense (and not in its exclusive sense) so that when used, for example, in a list of items "or," the term "or" allows an item, list, or group of items to be selected from the group to comprise one or more items. The term "based on" is to be interpreted as "based, at least in part, on". The term "one embodiment" does not necessarily refer to the same embodiment. The term "another embodiment" does not necessarily refer to a different embodiment. The term "some embodiments" does not necessarily refer to the same embodiment or to different embodiments. The terms "a or an" and "one or more" are used interchangeably. The term "plurality" refers to two or more. The terms "at least one" and "one or more" have the same meaning. The terms "including" and / or "having" are used interchangeably. The term "including" does not exclude other elements or steps. The term "or" is used in its inclusive sense (and not in its exclusive sense) so that when used, for example, in a list of items "or," the term "or" allows an item, list, or group of items to be selected from the group to comprise one or more items.

[0085] The above-described embodiments are merely illustrative for the present application and are not to be interpreted in a limiting manner. It is to be noted that variations and modifications of the present application can become apparent to those skilled in the art after reviewing the foregoing description. The scope of the present application is defined by the appended claims.

Claims

1. A gas-liquid filter characterized by, The gas-liquid filter comprises: a shell, which is sequentially provided with a first through hole, a shell cavity and a second through hole along a first direction, the first through hole being communicated with the shell cavity; a filter element, which is arranged in the shell cavity and communicated with the second through hole, and is used for filtering and separating a target fluid; wherein the target fluid enters the shell cavity from the first through hole; and a buffer element, which is connected with the filter element, and is provided with a buffer portion, the buffer portion being oppositely arranged with the first through hole and used for providing a buffer for the target fluid to reduce the speed of the target fluid; wherein the buffer element is provided with a buffer surface, the buffer surface being oppositely and spacedly arranged with the first through hole; the buffer portion is arranged as a backflush cavity, the backflush cavity being arranged on the buffer surface and recessed along the first direction; the target fluid entering the shell cavity is flushed into the backflush cavity and moves out of the backflush cavity from the cavity wall of the backflush cavity to realize bypassing.

2. The gas-liquid filter according to claim 1, wherein: the first through hole comprises a first hole section and a second hole section, the first hole section and the second hole section being sequentially arranged along the first direction, the first hole section being configured to be communicated with a first target element; the second hole section being respectively communicated with the first hole section and the shell cavity, a hole wall of the second hole section being obliquely arranged to gradually reduce a hole inner profile area of the second hole section along a direction opposite to the first direction; wherein the first target element is used for providing the target fluid.

3. The gas-liquid filter according to claim 1, characterized by Further comprising: a first connecting joint, which is connected with the shell and is provided with a first connecting channel, the first connecting channel comprising a first channel section and a second channel section, the first channel section being configured to be communicated with a first target element, the second channel section being respectively communicated with the first channel section and the first through hole, a first included angle being formed between an extension direction of the second channel section and an extension direction of the first channel section; or / and, a second connecting joint, which is connected with the shell and is provided with a second connecting channel, the second connecting channel comprising a third channel section and a fourth channel section, the third channel section being configured to be communicated with a second target element, the fourth channel section being respectively communicated with the third channel section and the second through hole, a second included angle being formed between an extension direction of the fourth channel section and an extension direction of the third channel section.

4. The gas-liquid filter according to claim 1, wherein: the filter element comprises a plurality of filter cartridges, the plurality of filter cartridges being coaxially arranged, each of the filter cartridges being provided with a filter hole, the filter hole penetrating a cartridge wall of the filter cartridge, and a separation cavity being formed between adjacent two filter cartridges; the second through hole is communicated with a first filter cartridge, the first filter cartridge being an innermost filter cartridge.

5. The gas-liquid filter according to claim 4, wherein: each of the filter cartridges is provided with a plurality of filter holes, the plurality of filter holes being uniformly distributed along a circumferential direction of the filter cartridge; or / and, The filter holes on two adjacent filter cartridges are staggered; Or / and, The number of filter holes on each filter cartridge decreases in the opposite direction of the second direction; Or / and, The hole area of the filter holes on each filter cartridge decreases in the second direction; Wherein, the second direction is the direction of the filter cartridge wall towards the center of the filter cartridge.

6. The gas-liquid filter according to claim 4, characterized in that: The filter core comprises a first cover and a second cover, the first cover and the second cover are sequentially and spaced apart in the first direction, the first cover and the second cover are provided with a limiting groove, the two ends of the filter cartridge are arranged in the corresponding limiting groove, and the filter cartridge is fixedly connected with the first cover and the second cover; the first cover is connected with the buffer; the second cover is connected with the shell, the second cover is provided with a third through hole, and the third through hole is communicated with the first filter cartridge and the second through hole.

7. The gas-liquid filter according to claim 6, characterized in that: The second cover is threadedly connected or / and welded with the shell.

8. The gas-liquid filter according to claim 1, characterized in that: The first through hole is arranged below the second through hole.

9. A gas-liquid separation method based on the gas-liquid filter according to any one of claims 1 to 8, characterized by, Including: Receiving the target fluid through the first through hole; In the case that the target fluid enters the shell cavity, the buffer part of the buffer provides buffer for the target fluid to reduce the speed of the target fluid; Filtering the target fluid through the filter core to obtain a first filtered fluid, and the first filtered fluid is discharged from the shell cavity through the second through hole.

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