A slurry mixing system

Abstract

The present application provides a kind of slurry stirring system, comprising: stirring tank, the bottom wall of stirring tank is equipped with gas inlet;Gas generating device, gas generating device is connected with gas inlet, and gas generating device is used to provide gas to stirring tank by the gas inlet;Filter screen, filter screen is arranged in stirring tank, and is connected with the lateral wall of stirring tank.The slurry stirring system provided by the present application provides gas to stirring tank by gas generating device, so that gas contacts battery slurry to generate bubbles, and battery slurry is stirred based on bubble breakage, while filter screen is arranged on the lateral wall of stirring tank to avoid battery slurry being carried out by bubbles floating out, replace mechanical stirring device to realize uniform dispersion of battery slurry.

Description

Technical Field

[0001] This invention relates to the field of battery slurry mixing technology, and more specifically to a battery slurry mixing system. Background Technology

[0002] New energy vehicles have become the main trend in future automotive development, and the demand for power batteries is increasing daily. In the power battery production process, especially in the lithium-ion battery production process, the first step is the mixing of battery slurry.

[0003] Related battery slurry mixing technology usually adopts mechanical mixing. Whether the battery slurry is mixed and dispersed in a double planetary mixer or a regular mechanical mixer, the longer the mixing time, the more the friction generated by the relatively high-speed movement between the grinding or dispersing device and the battery slurry in the mixer will cause the grinding or dispersing device to wear out quickly.

[0004] However, metal particles generated by wear and tear can fall into the battery slurry, severely affecting battery quality. This can lead to self-discharge, overcharging, poor storage performance, and even internal short circuits causing fires and explosions. Therefore, the mixing process of the battery slurry is a crucial step in the early stages of battery manufacturing, directly impacting battery performance. Consequently, it is necessary to improve the battery slurry mixing equipment in related technologies. Summary of the Invention

[0005] The present invention provides a slurry mixing system, which provides gas to the mixing tank through a gas generating device and sets a filter screen on the side wall of the mixing tank to generate bubbles inside the mixing tank. The filter screen causes the bubbles to burst before they rise to a preset height in the mixing tank, so as to uniformly mix the battery slurry and avoid the technical problem of metal particles falling into the battery slurry due to wear during the mechanical mixing process.

[0006] An embodiment of the present invention provides a slurry mixing system, comprising:

[0007] A mixing tank, wherein the bottom wall of the mixing tank is provided with an air inlet;

[0008] A gas generating device, connected to the air inlet, for supplying gas to the mixing tank through the air inlet; and

[0009] A filter screen is disposed inside the mixing tank and connected to the side wall of the mixing tank.

[0010] In one embodiment, the filter screen includes a first filter screen and a second filter screen; the second filter screen is disposed on the side of the first filter screen away from the bottom wall, and the pore size of the second filter screen is smaller than the pore size of the first filter screen.

[0011] In one embodiment, the filter screen further includes a third filter screen; the third filter screen is disposed on the side of the second filter screen away from the bottom wall, and the pore size of the third filter screen is larger than that of the second filter screen.

[0012] In one embodiment, the filter screen further includes a fourth filter screen; the fourth filter screen is disposed on the side of the third filter screen away from the bottom wall, and the pore size of the fourth filter screen is smaller than that of the third filter screen.

[0013] In one embodiment, the slurry mixing system further includes a negative pressure generating device, and the top wall of the mixing tank is provided with at least one air extraction port; the air extraction port is connected to the negative pressure generating device.

[0014] In one embodiment, the filter screen is slidably connected to the side wall of the mixing tank.

[0015] In one embodiment, the mixing tank includes an upper tank and a lower tank, the upper tank and the lower tank being detachably connected.

[0016] In one embodiment, the air inlet includes a plurality of spaced sub-air inlets, and the filter screen includes a plurality of mesh openings, with each of the plurality of sub-air inlets corresponding to one of the plurality of mesh openings.

[0017] In one embodiment, the slurry mixing system further includes multiple solenoid valves, and the air inlet includes multiple spaced sub-air inlets, with each sub-air inlet connected to a corresponding solenoid valve; the solenoid valves are used to control the amount of gas entering the mixing tank through the sub-air inlets.

[0018] In one embodiment, the top wall of the mixing tank is provided with a feed inlet, and the side wall of the mixing tank is provided with a discharge outlet.

[0019] In an embodiment of the present invention, gas is supplied to the inside of the mixing tank through a gas generating device, so that the gas contacts the battery slurry to generate bubbles. The battery slurry is stirred based on the rising and bursting of the bubbles inside the mixing tank. A filter screen is set on the side wall of the mixing tank to prevent the bubbles from rising and overflowing and carrying out the battery slurry. This replaces the existing mechanical stirring device for slurry and effectively solves the technical problem that wear of mechanical stirring devices causes metal particles to enter the battery slurry, thereby affecting the battery performance. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of a first structure of the slurry mixing system provided in an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of the filter screen provided in an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram showing the relationship between the air inlet and the filter screen provided in an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the intake pipe provided in an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of a second structure of the slurry mixing system provided in an embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of a third structure of the slurry mixing system provided in the embodiments of the present invention;

[0027] Figure 7 This is a schematic diagram of the fourth structure of the slurry mixing system provided in the embodiments of the present invention;

[0028] Figure 8 This is a schematic diagram of the fifth structure of the slurry mixing system provided in the embodiments of the present invention. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Furthermore, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present invention and are not intended to limit the present invention. In the present invention, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0030] Please see Figure 1 , Figure 1This is a schematic diagram of a first structure of a slurry mixing system provided in an embodiment of the present invention. Figure 1 As shown, the slurry mixing system 100 includes a mixing tank 10, a gas generating device 20, and a filter screen 30.

[0031] The mixing tank 10 includes a bottom wall 101, side walls 102, and a top wall. The bottom wall 101 and the top wall are arranged opposite each other, and the side walls 102, the top wall, and the bottom wall 101 enclose the mixing tank 10. The bottom wall 101 of the mixing tank 10 is provided with an air inlet 11. Specifically, the mixing tank 10 can be made of 304 stainless steel. 304 stainless steel mixing tanks are low in cost and have good wear resistance, which helps to reduce wear on the mixing tank 10 caused by high-speed mixing of the battery slurry. Of course, in some embodiments, the mixing tank 10 can also be made of other materials depending on actual needs.

[0032] Specifically, the mixing tank 10 is also provided with a feed inlet 12 and a discharge outlet 13. The feed inlet 12 is located on the top wall of the mixing tank 10, and the discharge outlet 13 is located on the side wall 102 of the mixing tank 10.

[0033] The feed inlet 12 may include multiple sub-feed inlets so that various raw materials of the battery slurry, such as battery powder and battery slurry solvent, can enter the mixing tank 10 through different sub-feed inlets.

[0034] The discharge port 13 can be located on the side wall near the bottom wall of the mixing tank 10 and away from the top wall of the mixing tank 10, so as to facilitate sampling of the battery slurry in the mixing tank 10 during or after the mixing of the battery slurry.

[0035] Specifically, in some embodiments provided by the present invention, the mixing tank 10 can be integrally formed.

[0036] Of course, in some embodiments provided by the present invention, the mixing tank 10 can be detachably configured. Specifically, the mixing tank 10 includes an upper tank body and a lower tank body, and the upper tank body and the lower tank body are detachably connected. Specifically, the upper tank body includes a top wall and an upper side wall, and the lower tank body includes a bottom wall and a lower side wall. The top wall and the bottom wall are arranged opposite to each other, and the upper side wall and the lower side wall are connected to form the side walls of the mixing tank 10. The air inlet 11 is located on the bottom wall of the lower tank body. Thus, the mixing tank 10 is easy to assemble and disassemble, and also easy to clean the interior of the mixing tank 10.

[0037] A sealing ring is provided at the connection between the upper and lower tanks to seal the connection and prevent battery slurry from overflowing. This good sealing environment also helps the negative pressure generating device 40 control the pressure inside the mixing tank 10. To facilitate assembly and disassembly of the upper and lower tanks, the depth of the upper tank is less than that of the lower tank.

[0038] The gas generating device 20 is connected to the air inlet 11, and the gas generating device 20 is used to supply gas to the mixing tank 10 through the air inlet 11. Specifically, the gas generating device 20 can be an air compressor or other gas source device capable of providing gas.

[0039] It should be noted that when gas enters the mixing tank 10 and comes into contact with the electrode slurry, the gas can form bubbles in the battery slurry. The bubbles rise from the bottom wall of the mixing tank 10 to the top wall of the mixing tank 10. The dispersion force generated by the bursting of the bubbles during the rising process stirs and disperses the battery slurry, so that the battery slurry does not agglomerate or clump together.

[0040] The filter screen 30 is installed inside the mixing tank 10 and is connected to the side wall of the mixing tank 10.

[0041] It is understood that the filter screen 30 is connected to the side wall of the mixing tank 10, that is, the filter screen 30 is disposed between the bottom wall 101 and the top wall of the mixing tank 10. The purpose of this arrangement is to prevent air bubbles from rising from the bottom wall 101 of the mixing tank 10 and overflowing from the battery slurry. If air bubbles overflow and rupture between the top wall of the mixing tank 10 and the liquid surface of the battery slurry, the air bubbles will carry out some battery slurry, and after the air bubbles rupture, the carried-out battery slurry will splash onto the inner wall of the mixing tank 10, resulting in uneven mixing of the battery slurry. Therefore, the slurry mixing system 100 provided in this embodiment of the invention provides a filter screen 30 inside the mixing tank 10 to prevent uneven mixing of the battery slurry caused by air bubble overflow.

[0042] In some embodiments of the present invention, the filter screen 30 is slidably connected to the side wall 102 of the mixing tank 10. This allows for flexible adjustment of the position of the filter screen 30 on the side wall 102 of the mixing tank 10 according to the depth of the battery slurry in the mixing tank 10, so that bubbles burst before reaching a preset height, thereby improving the uniformity of the battery slurry mixing. In some embodiments, bolts can be provided at different heights on the side wall 102 of the mixing tank 10. When adjusting the height of the filter screen 30 relative to the bottom wall 101 of the mixing tank 10 to a preset height, the filter screen 30 is directly connected to the bolts at the corresponding heights, thus achieving position adjustment of the filter screen 30 on the side wall 102 of the mixing tank 10.

[0043] In some embodiments provided by the present invention, the filter screen 30 includes a first filter screen 31 and a second filter screen 32. The second filter screen 32 is disposed on the side of the first filter screen 31 away from the bottom wall of the mixing tank 10, and the pore size of the second filter screen 32 is smaller than the pore size of the first filter screen 31.

[0044] Since the bubbles formed in the battery slurry vary in size, this embodiment provides a first filter 31 and a second filter 32 with different pore sizes in the mixing tank 10. The first filter 31 causes some relatively large bubbles to burst before they rise to a first preset height in the mixing tank 10, while the second filter 32 causes some relatively small bubbles to burst before they rise to a second preset height. This further prevents smaller bubbles from rising above the surface of the battery slurry and bursting near the top wall of the mixing tank 10, causing the battery slurry carried out by the bubbles to splash onto the inner wall of the mixing tank 10, thus preventing uneven mixing of the battery slurry. Therefore, the slurry mixing system 100 provided in this embodiment of the invention provides a first filter 31 and a second filter 32 to prevent the overflow of bubbles of different sizes and the resulting uneven mixing of the battery slurry, thereby achieving uniform mixing of the battery slurry.

[0045] Both the first filter screen 31 and the second filter screen 32 can be honeycomb stainless steel mesh.

[0046] For details, please refer to Figure 2 ,in, Figure 2 A schematic diagram of the structure of a filter screen provided in an embodiment of the present invention is shown. Figure 2 As shown, the filter screen 30 is a honeycomb stainless steel mesh, which includes multiple sequentially arranged mesh openings 301, wherein the mesh openings 301 have a regular hexagonal structure. It is worth mentioning that... Figure 2 This is merely an illustrative example of the filter screen 30. In other embodiments provided by the present invention, the mesh 301 may also be a regular polygonal structure such as an equilateral triangle, rectangle, or regular pentagon, and the grid unit may also be a circular or elliptical structure.

[0047] In some embodiments provided by this invention, please refer to Figure 1 as well as Figure 3 ,in, Figure 3 This is a schematic diagram illustrating the relationship between the air inlet and the filter screen according to an embodiment of the present invention. Specifically, the air inlet 11 provided on the bottom wall 101 of the mixing tank 10 includes a plurality of spaced sub-air inlets 111, and the filter screen 30 includes a plurality of mesh openings 301, with each sub-air inlet 111 corresponding to one of the mesh openings 301. Thus, bubbles generated by each sub-air inlet 111 are intercepted by a corresponding mesh opening 301.

[0048] The size of the multiple sub-intake ports 111 can be the same or different. The size of the sub-intake ports 111 can be adjusted according to the actual situation.

[0049] The multiple sub-intake ports 111 can have the same shape or different shapes, and the shape of the sub-intake ports 111 can be adjusted according to the actual needs. Specifically, the shape of the sub-intake ports 111 can be one or more of the following: circular, elliptical, and regular polygonal.

[0050] In some embodiments provided by the present invention, the plurality of sub-intake ports 111 may include a plurality of first sub-intake ports and a plurality of second sub-intake ports. The diameter of the first sub-intake port is larger than the diameter of the second sub-intake port.

[0051] Specifically, along the circumferential direction of the bottom wall of the mixing tank 10, the first sub-air inlet and the second sub-air inlet are alternately arranged; and along the radial direction of the bottom wall of the mixing tank 10, multiple first sub-air inlets are arranged at equal intervals with a first distance, and multiple second sub-air inlets are arranged at equal intervals with a second distance, and the first distance is different from the second distance.

[0052] Accordingly, in some other embodiments provided by the present invention, a plurality of first sub-inlets are equally spaced along the circumferential direction of the bottom wall of the mixing tank 10, and a plurality of second sub-inlets are equally spaced; and along the radial direction of the bottom wall of the mixing tank 10, the first sub-inlets and the second sub-inlets are equally spaced.

[0053] It is worth mentioning that, since the first filter screen 31 is relatively located closer to the bottom wall 101 of the mixing tank 10, when multiple filter screens 30 are provided in the mixing tank 10, the first filter screen 31 can play a guiding role in the upward floating of air bubbles.

[0054] Please continue reading for more details. Figure 1 In the slurry mixing system 100 provided in this embodiment, the air inlet 11 is connected to the gas generating device 20 through the air inlet pipe 15. Specifically, one end of the air inlet pipe 15 is connected to the air inlet 11, and the other end of the air inlet pipe 15 is connected to the gas generating device 20.

[0055] For details, please refer to Figure 1 as well as Figure 4 , Figure 4 A schematic diagram of the intake pipe provided for an embodiment of the present invention. (See attached diagram.) Figure 1 as well as Figure 4As shown, in the battery slurry mixing system 100, the air inlet pipe 15 is connected between the gas generating device 20 and the mixing tank 10. Specifically, the air inlet pipe 15 includes a plurality of first air inlet pipes 151, a plurality of second air inlet pipes 152, and a plurality of third air inlet pipes 153.

[0056] Specifically, multiple first air inlet pipes 151 are arranged radially along the bottom wall of the mixing tank 10, and the multiple first air inlet pipes 151 are respectively connected to the gas generating device 20 and multiple second air inlet pipes 152; the multiple second air inlet pipes 152 are arranged end to end along the circumferential direction of the bottom wall of the mixing tank 10; the multiple third air inlet pipes 153 are connected to the multiple second air inlet pipes 152, and the multiple third air inlet pipes 153 are connected one-to-one with multiple sub-air inlets 111.

[0057] It should be noted that in this embodiment, multiple first air inlet pipes 151 are connected to the gas generating device, thereby ensuring that the gas pressure received by the second air inlet pipe 152 connected to the first air inlet pipe 151 is consistent. For example, when the first air inlet pipes 151 are evenly spaced on the bottom wall of the mixing tank 10, the gas pressure flowing through the second air inlet pipe 152 is further made consistent, and the gas pressure flowing through the third air inlet pipe 153 is further made consistent. Based on this, when the opening degree of the multiple solenoid valves 50 is consistent, the amount of gas entering the mixing tank 10 through the sub-air inlet 111 is consistent, which is beneficial to achieving uniform mixing of the battery slurry.

[0058] Therefore, in the slurry mixing system 100 provided in this embodiment, gas is supplied to the mixing tank 10 by the gas generating device 20, and a filter screen 30 is provided on the side wall 102 of the mixing tank 10. This causes the gas to form bubbles in the battery slurry, and the bubbles are ruptured before reaching a preset height, thus achieving uniform mixing of the battery slurry. Since this slurry mixing system 100 uses a bubble mixing method, which is different from the mechanical mixing method in related technologies, it does not involve the device wear problems caused by the mechanical mixing process. While improving the purity of the battery slurry, it also ensures uniform mixing of the battery slurry.

[0059] Please see Figure 5 , Figure 5 This is a schematic diagram of a second structure of a slurry mixing system provided in an embodiment of the present invention. (See attached diagram.) Figure 5 As shown, the difference between the slurry mixing system 100 of this embodiment and the aforementioned slurry mixing system 100 is that the filter screen 30 further includes a third filter screen 33. The third filter screen 33 is disposed on the side of the second filter screen 32 away from the bottom wall of the mixing tank 10, and the aperture of the third filter screen 33 is larger than that of the second filter screen 32. The third filter screen 33 is a honeycomb stainless steel mesh.

[0060] It is worth mentioning that the purpose of providing a third filter screen 33 in this embodiment is to position the third filter screen 33 on the side of the second filter screen 32 away from the bottom wall 101 of the mixing tank 10, so that the pore size of the second filter screen 32, which is between the first filter screen 31 and the third filter screen 33, is relatively small. This prevents the battery powder and battery slurry solvent from combining to form agglomerates of slurry with a relatively large volume, which would then pass through the second filter screen 32 and the first filter screen 31 and sink to the bottom wall 101 of the mixing tank 10, causing blockage of the air inlet 11 and prolonging the mixing time. Specifically, the pore size range of the second filter screen 32 is 2 mm to 4 mm, the pore size range of the first filter screen 31 is 15 mm to 25 mm, and the pore size range of the third filter screen is 20 mm to 25 mm.

[0061] Please see Figure 6 , Figure 6 This is a schematic diagram of a third structure of a slurry mixing system provided in an embodiment of the present invention. (See attached diagram.) Figure 6 As shown, the difference between the slurry mixing system 100 of this embodiment and the aforementioned slurry mixing system 100 is that the filter screen 30 further includes a fourth filter screen 34. The fourth filter screen 34 is disposed on the side of the third filter screen 33 away from the bottom wall of the mixing tank 10, and the aperture of the fourth filter screen 34 is smaller than that of the third filter screen 33. The fourth filter screen 34 can be a honeycomb stainless steel mesh.

[0062] It is worth mentioning that the purpose of setting a fourth filter screen 34 in this embodiment is to further prevent air bubbles with a diameter smaller than the aperture of the third filter screen 33 from bursting after passing through the third filter screen 33 by setting the fourth filter screen 34 on the side of the third filter screen 33 away from the bottom wall of the mixing tank 10. At the same time, it further prevents large-sized slurry agglomerates formed on the side of the third filter screen 33 away from the bottom wall of the mixing tank 10 from agglomerating and settling.

[0063] Please see Figure 7 , Figure 7 This is a schematic diagram of a fourth structure of a slurry mixing system provided in an embodiment of the present invention. (See diagram below.) Figure 7 As shown, the difference between the slurry mixing system 100 of this embodiment and the slurry mixing system 100 described above is that the slurry mixing system 100 of this embodiment further includes a negative pressure generating device 40.

[0064] The negative pressure generating device 40 is connected to the mixing tank 10 to adjust the pressure inside the mixing tank 10. Based on this pressure adjustment, the rate of bubble bursting is controlled, thereby controlling the uniformity of the battery slurry mixing. Specifically, the negative pressure generating device 40 can be a vacuum pump or other device capable of providing negative pressure. The suction port 14 is connected to the negative pressure generating device 40 via a suction pipe. Specifically, one end of the suction pipe is connected to the suction port 14, and the other end is connected to the negative pressure generating device 40.

[0065] Specifically, the top wall of the mixing tank 10 is provided with at least one air extraction port 14, which is connected to the negative pressure generating device 40. It is worth mentioning that the purpose of placing the air extraction port 14 on the top wall of the mixing tank 10 is to prevent air bubbles from rising and bursting within the mixing tank 10 and splashing onto the air extraction port 14, causing some battery slurry to adhere to the air extraction port 14 and cause blockage, thereby affecting the operation of the negative pressure generating device 40. Due to the filter screen 30, air bubbles will burst when they rise to a preset height, thus preventing them from rising to the side of the filter screen 30 closest to the top wall of the mixing tank 10.

[0066] In other embodiments provided by the present invention, at least one air extraction port 14 may also be provided on the side wall of the mixing tank 10, and the air extraction port 14 is located on the side of the filter screen 30 near the top wall of the mixing tank 10, so as to prevent bubbles from rising and bursting in the mixing tank 10 and splashing to the air extraction port 14, causing some battery slurry to adhere to the air extraction port 14 and cause blockage.

[0067] In some embodiments provided by the present invention, the air extraction port 14 is provided with a powder filter screen to prevent the negative pressure generating device 40 from carrying out the battery powder that has not been combined with the battery slurry solvent out of the mixing tank 10 when it is working.

[0068] Please see Figure 8 ,like Figure 8 As shown, Figure 8 This is a fifth structural schematic diagram of a slurry mixing system provided in an embodiment of the present invention. The difference between the slurry mixing system 100 of this embodiment and the aforementioned slurry mixing system 100 is that the slurry mixing system 100 of this embodiment further includes multiple solenoid valves 50. Each of the multiple solenoid valves 50 is connected to a corresponding sub-inlet 111. The solenoid valves 50 are used to control the amount of gas entering the mixing tank 10 through the sub-inlet 111.

[0069] Specifically, the opening degree of the solenoid valve 50 determines the amount of gas supplied to the mixing tank 10 per unit time. Therefore, by controlling the opening degrees of multiple solenoid valves 50 differently, different numbers of bubbles can be generated at the sub-inlet 111 at different locations per unit time. Based on the different numbers of bubbles, the degree of stirring and dispersion of the battery slurry due to bubble bursting is different, thereby adjusting the degree of stirring of the battery slurry in the stirring area corresponding to the sub-inlet 111, so as to make the battery slurry uniformly stirred as a whole.

[0070] Embodiments of the present invention also provide a slurry mixing method based on the slurry mixing system, specifically including the following steps:

[0071] Step S01: Add battery slurry solvent into the mixing tank;

[0072] Step S02: Turn on the gas generating device;

[0073] Step S03: Add battery powder into the mixing tank.

[0074] In some embodiments provided by the present invention, after step S01 and before step S02, the method further includes turning on the negative pressure generating device to make the pressure in the mixing tank within the range of -5KPa to -30KPa.

[0075] In some embodiments provided by the present invention, after step S02 and before step S03, the method further includes controlling the opening degree of the solenoid valve to be 50%.

[0076] In some embodiments provided by the present invention, after step S03, the method further includes controlling the opening degree of the solenoid valve to be within the range of 50% to 100%, and after a preset time, sampling and testing the battery slurry in the mixing tank.

[0077] The slurry stirring method provided by the embodiments of the present invention enables the battery slurry to be rapidly stirred and dispersed in a short time. Since it adopts a bubble stirring process, which is different from the mechanical stirring process in related technologies, it avoids the device wear problem caused by mechanical stirring process. While ensuring the purity of the battery slurry, it improves the uniformity of the battery slurry stirring, thereby improving the battery quality.

[0078] The embodiments of the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A slurry mixing system for mixing battery slurry, characterized in that, include: A mixing tank, wherein the bottom wall of the mixing tank is provided with an air inlet; A gas generating device is connected to the air inlet and is used to supply gas into the mixing tank through the air inlet. as well as A filter screen is disposed inside the mixing tank and connected to the side wall of the mixing tank. It is located within the battery slurry and is adapted to contact air bubbles to break them. The filter screen includes a first filter screen and a second filter screen; The second filter screen is disposed on the side of the first filter screen away from the bottom wall, and the pore size of the second filter screen is smaller than that of the first filter screen; The filter screen also includes a third filter screen; The third filter screen is disposed on the side of the second filter screen away from the bottom wall, and the pore size of the third filter screen is larger than that of the second filter screen; The filter screen also includes a fourth filter screen; The fourth filter screen is disposed on the side of the third filter screen away from the bottom wall, and the pore size of the fourth filter screen is smaller than that of the third filter screen. The slurry mixing system also includes a negative pressure generating device, and the top wall of the mixing tank is provided with at least one air extraction port; the air extraction port is connected to the negative pressure generating device, and the negative pressure generating device is used to adjust the pressure inside the mixing tank, thereby controlling the rate at which the bubbles burst based on the pressure adjustment inside the mixing tank.

2. The slurry mixing system according to claim 1, characterized in that, The filter screen is slidably connected to the side wall of the mixing tank.

3. The slurry mixing system according to claim 1, characterized in that, The mixing tank includes an upper tank and a lower tank, which are detachably connected.

4. The slurry mixing system according to claim 1, characterized in that, The air inlet includes multiple spaced sub-air inlets, and the filter screen includes multiple mesh openings, with each of the multiple sub-air inlets corresponding to one of the multiple mesh openings.

5. The slurry mixing system according to claim 1, characterized in that, The slurry mixing system also includes multiple solenoid valves, and the air inlet includes multiple spaced sub-air inlets, with each of the multiple sub-air inlets connected to a corresponding solenoid valve. The solenoid valve is used to control the amount of gas entering the mixing tank through the sub-inlet.

6. The slurry mixing system according to claim 1, characterized in that, The mixing tank has a feed inlet on its top wall and a discharge outlet on its side wall.

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