Battery diaphragm powder mixing device

Abstract

The invention discloses a battery diaphragm powder mixing device which comprises a mounting seat, a stirring tank rotationally arranged on the mounting seat, a stirring assembly rotationally arranged in the stirring tank, a first motor for driving the stirring tank to rotate, a second motor for driving the stirring assembly to rotate and a control mechanism for controlling the first motor and the second motor to work, the stirring assembly comprises a stirring shaft and stirring blades arranged in the length direction of the stirring shaft; an air inlet duct and a first air outlet duct are arranged at the two ends of the stirring shaft respectively, an air inlet hole communicated with the air inlet duct and an air outlet hole communicated with the first air outlet duct are formed in the stirring shaft, and an external air pump continuously inputs inert gas into the stirring tank through the air inlet duct and the air inlet hole; gas in the stirring tank is discharged out of the tank along the gas outlet hole and the first gas outlet duct, so that the phenomena of oxidative degradation and agglomeration of the polymer powder are avoided, and the problems of poor uniformity and chemical stability of the polymer powder are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lithium battery separator production device, and particularly relates to a battery separator powder mixing device. BACKGROUND

[0002] The preparation of lithium battery separator usually starts from the blending and modification of various polyolefin resins, pore-forming agents and other functional additives. Therefore, a mixing device needs to be used to stir and mix various polymer powders in production. In the stirring process, the polymer powder is in contact with oxygen after being heated, which may cause oxidative degradation, affecting the molecular chain structure. In addition, the polymer powder may agglomerate in the stirring process, resulting in uneven stirring of the powder, poor uniformity of the polymer powder and poor chemical stability, which further deteriorates the final performance of the separator. SUMMARY

[0003] The present application provides a battery separator powder mixing device, which can avoid the contact between the polymer powder and oxygen after being heated in the stirring process, ensure the chemical stability of the polymer powder, and improve the stirring uniformity of the polymer powder.

[0004] To achieve the above-mentioned purpose, the technical scheme is as follows: A battery separator powder mixing device, comprising a mounting seat, a stirring tank rotatably arranged on the mounting seat, a stirring assembly rotatably arranged in the stirring tank, a first motor for driving the stirring tank to rotate, a second motor for driving the stirring assembly to rotate, and a control mechanism for controlling the operation of the first motor and the second motor, wherein the stirring assembly comprises a stirring shaft and stirring blades arranged along the length direction of the stirring shaft, the stirring tank is arranged horizontally in the axial direction, and the stirring tank and the stirring shaft are coaxially arranged; the stirring shaft is provided with an air inlet duct and a first air outlet duct at both ends thereof, the stirring shaft is provided with an air inlet hole communicating with the air inlet duct and an air outlet hole communicating with the first air outlet duct, and when in operation, an external air pump continuously inputs inert gas into the stirring tank through the air inlet duct and the air inlet hole, and the gas in the stirring tank is discharged out of the tank through the air outlet hole and the first air outlet duct; by continuously inputting inert gas into the stirring tank during stirring, oxidative degradation of the polymer powder after being heated is avoided, and the continuous input of gas can also avoid the agglomeration of the polymer powder, thereby solving the problems of poor uniformity and chemical stability of the polymer powder.

[0005] As a preferred scheme, the stirring tank is provided with a first mounting shaft and a second mounting shaft at two ends respectively, the first mounting shaft and the second mounting shaft are respectively provided with a first through hole and a second through hole for the stirring shaft to pass through, one end of the stirring shaft provided with the air inlet channel passes out of the stirring tank through the first through hole; the mounting base is rotatably provided with a first connecting shaft, the first motor is drivingly connected with the first connecting shaft, the first connecting shaft is fixedly connected with the first mounting shaft through a flange, the first connecting shaft is provided with a mounting groove, one end of the stirring shaft provided with the first air outlet channel passes through the first through hole and is rotatably mounted in the mounting groove, the mounting groove is provided with a second air outlet channel communicating with an external space; the mounting base is further provided with a second connecting shaft, the second connecting shaft is provided with a third through hole, the second connecting shaft is fixedly connected with the second mounting shaft through a flange, one end of the stirring shaft provided with the air inlet channel passes through the second through hole and the third through hole and is drivingly connected with the second motor, a rotary joint is rotatably connected at an air inlet of the air inlet channel.

[0006] As a preferred scheme, the mounting groove is provided with a first bearing, one end of the stirring shaft is rotatably connected with the first bearing; the third through hole is provided with a second bearing, the other end of the stirring shaft is rotatably connected with the second bearing.

[0007] As a preferred scheme, the mounting base comprises a bottom plate, a first support and a second support oppositely arranged on the bottom plate, the first motor is arranged on the first support, and the second motor is arranged on the second support; the first connecting shaft is rotatably mounted on the first support, and the second connecting shaft is mounted on the second support.

[0008] As a preferred scheme, the air inlet hole is provided with a first filter screen for avoiding high polymer powder from entering the air inlet channel, and the air outlet hole is provided with a second filter screen for avoiding high polymer powder from entering the first air outlet channel.

[0009] As a preferred scheme, the stirring tank comprises a cylindrical portion and a conical portion integrally formed at two ends of the cylindrical portion, the cylindrical portion is provided with an in-out powder port, and the in-out powder port is provided with a sealing cover.

[0010] As a preferred scheme, the in-out powder port is provided with two in-out powder ports oppositely arranged on the circumferential side of the cylindrical portion, and the sealing cover is provided with two sealing covers respectively sealably connected at the two in-out powder ports.

[0011] As a preferred scheme, the stirring shaft is provided with a plurality of stirring blade mounting racks, the stirring blade mounting rack comprises a sleeve that can be sleeved on the stirring shaft, the sleeve is provided with a first mounting arm and a second mounting arm oppositely arranged, and the free ends of the first mounting arm and the second mounting arm are both provided with the stirring blade.

[0012] As a preferred solution, the sleeve is provided with a first fixing hole, the stirring shaft is provided with a second fixing hole corresponding to the first fixing hole, and the stirring blade mounting frame is fixed on the stirring shaft through the first fixing hole and the second fixing hole by means of screws or bolts.

[0013] As a preferred solution, the stirring blades located at the tapered portion are arranged in an inclined manner, and the inclination direction of the stirring blades is the same as the inclination direction of the side wall of the tapered portion.

[0014] Compared with the prior art, the present application has obvious advantages and beneficial effects, specifically, 1. By introducing inert gas into the stirring tank, the polymer powder in the stirring tank is in an inert environment during stirring, so that oxidation degradation of the polymer powder after heating and contact with oxygen is avoided, the chemical stability of the polymer powder is ensured, and the performance of the diaphragm is ensured. At the same time, the inert gas can protect the polymer powder, reduce the generation of static electricity during stirring, avoid dust explosion, and improve the safety of stirring. 2. By continuously introducing inert gas, the continuously introduced gas improves the flowability of the polymer powder, reduces the occurrence of agglomeration, improves the stirring uniformity, and ensures the performance of the diaphragm.

[0015] To more clearly illustrate the structural features, technical means and specific purposes and functions achieved by the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments: BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a schematic diagram of the assembly structure of an embodiment of the present application; Figure 2 is a sectional view of an embodiment of the present application; Figure 3 is Figure 2 is an enlarged schematic diagram of the structure at A in FIG. 4; Figure 4 is Figure 2 is an enlarged schematic diagram of the structure at B in FIG. 4; Figure 5 is a schematic diagram of the internal structure of an embodiment of the present application; Figure 6 is a schematic diagram of the exploded structure of the stirring assembly of an embodiment of the present application.

[0017] Explanation of the reference signs in the drawings: 10, mounting seat; 11, first motor; 12, second motor; 13, first connecting shaft; 131, mounting groove; 132, second air outlet duct; 133, first bearing; 14, second connecting shaft; 141, third through hole; 142, second bearing; 15, bottom plate; 16, first support; 17, second support; 20, stirring tank; 21, first mounting shaft; 211, first through hole; 22, second mounting shaft; 221, second through hole; 23, cylindrical portion; 24, conical portion; 25, powder inlet and outlet; 26, sealing cover; 30, stirring assembly; 31, stirring shaft; 311, air inlet duct; 312, first air outlet duct; 313, air inlet hole; 314, air outlet hole; 315, first filter screen; 316, second filter screen; 317, second fixing hole; 32, stirring blade; 33, rotary joint; 34, stirring blade mounting frame; 341, sleeve; 342, first mounting arm; 343, second mounting arm; 344, first fixing hole; 40, control mechanism. DETAILED DESCRIPTION

[0018] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the indicated position or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0019] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0020] As Figures 1-6The application discloses a battery diaphragm powder mixing device, which comprises a mounting base 10, a stirring tank 20 rotatably arranged on the mounting base 10, a stirring assembly 30 rotatably arranged in the stirring tank 20, a first motor 11 for driving the stirring tank 20 to rotate, a second motor 12 for driving the stirring assembly 30 to rotate and a control mechanism 40 for controlling the working of the first motor 11 and the second motor 12. The stirring assembly 30 comprises a stirring shaft 31 and stirring blades 32 arranged along the length direction of the stirring shaft 31. The stirring tank 20 is arranged horizontally in the axial direction, and the stirring tank 20 and the stirring shaft 31 are coaxially arranged. The stirring shaft 31 is provided with an air inlet duct 311 and a first air outlet duct 312 at two ends respectively. The stirring shaft 31 is provided with an air inlet hole 313 communicated with the air inlet duct 311 and an air outlet hole 314 communicated with the first air outlet duct 312. During working, an external air pump continuously inputs inert gas into the stirring tank 20 through the air inlet duct 311 and the air inlet hole 313, and the gas in the stirring tank 20 is discharged out of the tank through the air outlet hole 314 and the first air outlet duct 312. By continuously inputting inert gas into the stirring tank 20 during stirring, the oxidation degradation of the polymer powder after temperature rising can be avoided, and the continuous input of the gas can also avoid the agglomeration of the polymer powder, thereby solving the problems of poor uniformity and chemical stability of the polymer powder.

[0021] In the application, the inert gas is nitrogen, argon, helium or the like, preferably nitrogen.

[0022] In the application, the control mechanism 40 can be directly purchased in the market, and the structure and technical principle thereof are all prior art, which will not be repeated here.

[0023] The stirring tank 20 is provided with a first mounting shaft 21 and a second mounting shaft 22 at two ends respectively, the first mounting shaft 21 and the second mounting shaft 22 are respectively provided with a first through hole 211 and a second through hole 221 for the stirring shaft 31 to pass through, one end of the stirring shaft 31 provided with an air inlet duct 311 passes out of the stirring tank 20 through the first through hole 211; the mounting base 10 is rotatably provided with a first connecting shaft 13, the first motor 11 is drivingly connected with the first connecting shaft 13, the first connecting shaft 13 is fixedly connected with the first mounting shaft 21 through a flange, the first connecting shaft 13 is provided with a mounting groove 131, one end of the stirring shaft 31 provided with a first air outlet duct 312 passes through the first through hole 211 and is rotatably mounted in the mounting groove 131, the mounting groove 131 is provided with a second air outlet duct 132 communicating with an external space; the mounting base 10 is further provided with a second connecting shaft 14, the second connecting shaft 14 is provided with a third through hole 141, the second connecting shaft 14 is fixedly connected with the second mounting shaft 22 through a flange, one end of the stirring shaft 31 provided with the air inlet duct 311 passes through the second through hole 221 and the third through hole 141 and is drivingly connected with the second motor 12, a rotary joint 33 is rotatably connected at an air inlet of the air inlet duct 311; the mounting groove 131 is provided with a first bearing 133, one end of the stirring shaft 31 is rotatably connected with the first bearing 133; the third through hole 141 is provided with a second bearing 142, the other end of the stirring shaft 31 is rotatably connected with the second bearing 142; the mounting base 10 comprises a bottom plate 15, a first support 16 and a second support 17 oppositely arranged on the bottom plate 15, the first motor 11 is arranged on the first support 16, the second motor 12 is arranged on the second support 17; the first connecting shaft 13 is rotatably mounted on the first support 16, the second connecting shaft 14 is mounted on the second support 17; through the above arrangement, the first motor 11 and the second motor 12 can respectively drive the stirring tank 20 and the stirring shaft 31 to rotate, and the stirring uniformity is improved.

[0024] It should be understood that the first motor 11 and the second motor 12 can respectively drive the stirring tank 20 and the stirring shaft 31 to rotate in the same direction, or can drive the stirring tank 20 and the stirring shaft 31 to rotate in opposite directions.

[0025] In the present application, the rotary joint 33 is a commercially available rotary joint 33, and its structure and technical principle are all prior art, which will not be described here.

[0026] The first filter screen 315 is arranged at the air inlet hole 313 to prevent the high polymer powder from entering the air inlet duct 311, and the second filter screen 316 is arranged at the air outlet hole 314 to prevent the high polymer powder from entering the first air outlet duct 312; by arranging the first filter screen 315 and the second filter screen 316, the high polymer powder can be prevented from entering the air duct.

[0027] In the application, the hole diameter of the air inlet hole 313 is 0.1-2MM, preferably 0.5MM; the hole diameter of the air outlet hole 314 is 0.1-2MM, preferably 0.5MM.

[0028] The stirring tank 20 comprises a cylindrical part 23 and a conical part 24 integrally formed at both ends of the cylindrical part 23, the cylindrical part 23 is provided with powder inlet and outlet ports 25, the powder inlet and outlet ports 25 are provided with sealing covers 26; the powder inlet and outlet ports 25 are two, the two powder inlet and outlet ports 25 are oppositely arranged on the circumferential side of the cylindrical part 23; the sealing covers 26 are two, the two sealing covers 26 are respectively sealably connected at the two powder inlet and outlet ports 25; by arranging two powder inlet and outlet ports 25, it is convenient to put the polymer powder into the stirring tank 20 or take out the polymer powder after stirring.

[0029] In the application, the powder inlet and outlet port 25 is provided with a connecting cylinder, the connecting cylinder is fixedly connected with the sealing cover 26 through the flange away from one end of the stirring tank 20.

[0030] It should be understood that, in order to further improve the sealing effect, the sealing cover 26 is provided with a sealing ring (not shown in the figure) on the side facing the powder inlet and outlet port 25.

[0031] The stirring shaft 31 is provided with a plurality of stirring blade mounting frames 34, the stirring blade mounting frame 34 comprises a sleeve 341 which can be sleeved on the stirring shaft 31, the sleeve 341 is provided with oppositely arranged first mounting arms 342 and second mounting arms 343, the free ends of the first mounting arms 342 and the second mounting arms 343 are both provided with the stirring blades 32; the sleeve 341 is provided with a first fixing hole 344, the stirring shaft 31 is provided with a second fixing hole 317 corresponding to the first fixing hole 344, the stirring blade mounting frame 34 is fixed on the stirring shaft 31 by screwing or bolting through the first fixing hole 344 and the second fixing hole 317; the stirring blades 32 located in the conical part 24 are arranged obliquely, the oblique direction of the stirring blades 32 is the same as the oblique direction of the side wall of the conical part 24; by the above arrangement, the stirring uniformity of the polymer powder can be improved.

[0032] In the application, when installing the stirring blade mounting frame 34, the stirring shaft 31 is inserted into the stirring tank 20 through the first through hole 211, then the stirring blade mounting frame 34 is put into the stirring tank 20 through the powder inlet and outlet port 25, the sleeves 341 of the plurality of stirring blade mounting frames 34 are sleeved on the stirring shaft 31, and the stirring blade mounting frame 34 is locked by the first fixing hole 344 and the second fixing hole 317, thereby completing the installation of the stirring blade mounting frame 34.

[0033] The use method of the present application: the polymer powder is put into the stirring tank 20 through the powder inlet and outlet 25, then the sealing cover 26 is locked at the powder inlet and outlet 25, the equipment is started, the external air pump continuously inputs nitrogen into the stirring tank 20 through the air inlet duct 311 and the air inlet hole 313 for a certain time, the gas in the stirring tank 20 is discharged out of the stirring tank 20 along the air outlet hole 314 and the first air outlet duct 312, then the first motor 11 and the second motor 12 are started to drive the stirring tank 20 and the stirring shaft 31 to rotate respectively, so that the polymer powder is uniformly mixed, after the stirring is completed, the polymer powder is taken out through the powder inlet and outlet 25 after a certain time of standing and cooling, and the stirring is completed.

[0034] In summary, the inert gas is introduced into the stirring tank 20, so that the polymer powder in the stirring tank 20 is in an inert environment during stirring, the oxidation degradation of the polymer powder after heating is avoided by avoiding the contact of the polymer powder with oxygen, the chemical stability of the polymer powder is ensured, and the performance of the diaphragm is ensured; at the same time, the inert gas can protect the polymer powder, reduce the generation of static electricity during stirring, avoid dust explosion, and improve the stirring safety; by continuously introducing the inert gas, the continuously introduced gas improves the flowability of the polymer powder, reduces the occurrence of agglomeration, improves the stirring uniformity, and ensures the performance of the diaphragm.

[0035] The above is only a preferred embodiment of the present application, and is not used to limit the present application, so any modification, equivalent replacement, improvement, etc. of the above embodiment according to the technical spirit of the present application still belongs to the scope of the technical scheme of the present application.

Claims

1. A battery separator powder mixing apparatus, characterized by: The application relates to a stirring device, which comprises a mounting base, a stirring tank rotatably arranged on the mounting base, a stirring assembly rotatably arranged in the stirring tank, a first motor for driving the stirring tank to rotate, a second motor for driving the stirring assembly to rotate, and a control mechanism for controlling the first motor and the second motor to work. The stirring shaft is provided with an air inlet hole communicated with the air inlet duct and an air outlet hole communicated with the first air outlet duct.

2. The battery separator powder mixing device of claim 1, wherein, The stirring tank is provided with a first mounting shaft and a second mounting shaft at two ends respectively, the first mounting shaft and the second mounting shaft are respectively provided with a first through hole and a second through hole for the stirring shaft to pass through, and one end of the stirring shaft provided with the air inlet duct passes through the first through hole and extends out of the stirring tank. The mounting base is rotatably provided with a first connecting shaft, the first motor is connected with the first connecting shaft, the first connecting shaft is fixedly connected with the first mounting shaft through a flange, the first connecting shaft is provided with a mounting groove, one end of the stirring shaft provided with the first air outlet duct is rotatably arranged in the mounting groove through the first through hole, and the mounting groove is provided with a second air outlet duct communicated with an external space. The mounting base is further provided with a second connecting shaft, the second connecting shaft is provided with a third through hole, the second connecting shaft is fixedly connected with the second mounting shaft through a flange, one end of the stirring shaft provided with the air inlet duct passes through the second through hole and the third through hole and is connected with the second motor, and a rotary joint is rotatably connected at the air inlet of the air inlet duct.

3. The battery separator powder mixing device of claim 2, wherein, The mounting groove is provided with a first bearing, and one end of the stirring shaft is rotatably connected with the first bearing; the third through hole is provided with a second bearing, and the other end of the stirring shaft is rotatably connected with the second bearing.

4. The battery separator powder mixing device of claim 2, wherein, The mounting base comprises a bottom plate, a first support and a second support oppositely arranged on the bottom plate, the first motor is arranged on the first support, and the second motor is arranged on the second support; the first connecting shaft is rotatably arranged on the first support, and the second connecting shaft is arranged on the second support.

5. The battery separator powder mixing device of claim 1, wherein, The air inlet hole is provided with a first filter screen for preventing high polymer powder from entering the air inlet duct, and the air outlet hole is provided with a second filter screen for preventing high polymer powder from entering the first air outlet duct.

6. The battery separator powder mixing device of claim 1, wherein, The stirring tank comprises a cylindrical part and a conical part integrally formed at two ends of the cylindrical part, the cylindrical part is provided with an in-out powder port, and the in-out powder port is provided with a sealing cover.

7. The battery separator powder mixing device of claim 6, wherein, The in-out powder port is provided with two in-out powder ports oppositely arranged on the circumferential side of the cylindrical part, and the sealing cover is provided with two sealing covers which are respectively and sealably connected to the two in-out powder ports.

8. The battery separator powder mixing device of claim 6, wherein, The stirring shaft is provided with a plurality of stirring blade mounting racks, the stirring blade mounting rack comprises a sleeve which can be sleeved on the stirring shaft, the sleeve is provided with a first mounting arm and a second mounting arm oppositely arranged on the sleeve, and the free ends of the first mounting arm and the second mounting arm are both provided with the stirring blade.

9. The battery separator powder mixing device of claim 8, wherein, The sleeve is provided with a first fixing hole, and the stirring shaft is provided with a second fixing hole corresponding to the first fixing hole, and the stirring blade mounting frame is fixed on the stirring shaft through the first fixing hole and the second fixing hole by means of screws or bolts.

10. The battery separator powder mixing device of claim 9, wherein, The stirring blades located at the conical part are arranged in an inclined manner, and the inclination direction of the stirring blades is the same as the inclination direction of the side wall of the conical part.

Images