Negative electrode material ball-milling crushing equipment

Abstract

The utility model relates to a cathode material ball milling and crushing device, which comprises a base, a grinding mechanism and a screening mechanism, one end of the grinding mechanism is provided with a feed port, the other end of the grinding mechanism is provided with a discharge port, the grinding mechanism pushes, stirs and crushes a cathode material, and the screening mechanism is arranged above the discharge port. A screening mechanism is arranged on the grinding mechanism, the screening mechanism screens out the negative electrode material with the proper particle size after being smashed, the screening mechanism comprises a screening cylinder, the screening cylinder is rotationally arranged on the grinding mechanism, a plurality of screening holes which are formed in a penetrating mode are evenly distributed in the side wall of the screening cylinder, and when the screening cylinder rotates, the screening holes, participating in filtering and screening of the negative electrode material, of the screening cylinder are switched.

Description

Technical Field

[0001] The utility model relates to the technical field of negative electrode materials for lithium ion batteries, in particular to ball milling and crushing equipment for negative electrode materials. Background Art

[0002] In lithium-ion batteries, the negative electrode material is usually graphite or other carbon materials. These materials may have a large particle size during the preparation process, and need to be reduced by ball milling to increase the surface area and reaction activity of the material. In addition, ball milling can also improve the dispersion and uniformity of the negative electrode material and improve the consistency and stability of the battery. At the same time, the ball milling process can also remove impurities and defects in the material and improve the purity and quality of the material. The crushing of negative electrode materials is an important link in the production process of lithium-ion batteries and is of great significance to improving battery performance and quality.

[0003] A Chinese utility model patent with application number CN201520176251.5 discloses a ball mill for carbon negative electrode materials of lithium-ion batteries, including a ball mill cylinder, a connecting plate and a permanent magnet direct-drive synchronous motor; the ball mill cylinder includes a rolling body, an inner cylinder and an outer cylinder; an outer shell is arranged on the outside of the outer cylinder, and a sound-absorbing felt layer and a vacuum sound insulation layer are arranged in sequence between the outer cylinder and the outer shell; the connecting plate is arranged on the right side of the ball mill cylinder, and the connecting plate is welded and assembled to the ball mill cylinder, so that the ball mill cylinder can achieve adjustable speed and forward and reverse rotation.

[0004] However, the utility model applicant discovered that the device lacked control over the particle size of the negative electrode material at the discharge point. The existing technical solution was to directly set a filter at the discharge point and use the filter to screen the negative electrode material. However, after the filter had been working for too long, the filter holes on the filter would be clogged, requiring shutdown for inspection and cleaning. Utility Model Content

[0005] The purpose of the utility model is to address the deficiencies of the prior art. The utility model provides a ball milling device for negative electrode materials. The filter screen is set as a cylindrical screening cylinder, and the screening cylinder is rotated and switched at the same time, so that the screening holes on the screening cylinder that participate in the filtering and screening of the negative electrode materials can be switched at any time. After the switched screening holes are rotated to the upper part, most of the negative electrode materials that block the screening holes will directly fall due to gravity factors, so that the screening holes are no longer blocked and there is no need for manual cleaning.

[0006] In view of the above technical problems, the technical solution adopted by the utility model is as follows: a ball milling and crushing equipment for negative electrode materials, comprising: a base, a grinding mechanism and a screening mechanism, wherein a feed port is arranged at one end of the grinding mechanism and a discharge port is arranged at the other end, the grinding mechanism pushes, stirs and crushes the negative electrode materials, the screening mechanism is arranged above the discharge port, and the screening mechanism screens out the negative electrode materials that reach a suitable particle size after crushing, the screening mechanism comprises a screening drum, the screening drum is rotatably arranged on the grinding mechanism, the side wall of the screening drum is evenly distributed with a plurality of screening holes arranged through it, and when the screening drum rotates, the screening holes of the screening drum are switched to participate in the filtering and screening of the negative electrode materials.

[0007] As a preferred embodiment, the grinding mechanism includes a driving member, a screw shaft, a roller, a shell and a motor, the driving member is arranged on the side of the base close to the discharge port, the screw shaft is rotatably arranged on the base, one end of the screw shaft is connected to the driving member, the roller is coaxially arranged on the screw shaft, the roller outer shell is provided with a gear ring, the side of the roller away from the driving member is provided with a feed port, the base at the feed port is provided with a feed nozzle connected with the feed port, the screening drum and the roller form a grinding chamber, a plurality of steel balls are arranged in the grinding chamber, the shell is rollingly sealed and connected to the roller, a retaining frame is arranged between the roller and the screening drum, the shell is fixedly arranged on the base, the discharge port is arranged at the bottom of the shell, the discharge port is in an inverted step-type, and the screening drum is rotatably installed in the shell, the motor is arranged on one side of the roller, a mounting seat is arranged at the bottom of the motor, a motor gear is arranged on the motor shaft, the motor gear meshes with the gear ring to drive the roller to rotate, and the rotation direction of the roller is opposite to that of the screw shaft.

[0008] As a preference, the shaft body of the screw shaft adopts a spiral structure, and the screw shaft rotates to drive the negative electrode material to move.

[0009] As a preferred embodiment, the screening drum rotation speed V1 and the drum rotation speed V2 satisfy the relationship: 25*V1≤V2≤40*V1.

[0010] As a preferred embodiment, the screening drum and the screw shaft are connected via a planetary gear set, which includes a ring gear, a sun gear and a planetary gear. The ring gear is coaxially fixedly mounted on the screening drum, the sun gear is sleeved on the screw shaft, and the planetary gear is installed between the ring gear and the sun gear. The planetary gear transmission connects the ring gear and the sun gear, and the planetary gear is mounted on the outer casing via a self-rotating mounting plate.

[0011] Preferably, the screening mechanism further comprises an oscillating component, which is arranged on the top of the shell and strikes the screening cylinder.

[0012] As a preferred embodiment, the oscillation assembly includes an oscillator, a shock absorber, a hammer and a roller. The oscillator is fixedly mounted on the top of the shell, the shock absorber is arranged between the bottom of the oscillator and the top of the European shell, the hammer is arranged on the oscillator, and the bottom of the hammer vibrates against the screening drum through a rotating roller, and the roller is made of rubber material.

[0013] Beneficial effects of the utility model:

[0014] 1. By setting a rotating screening cylinder, the negative electrode materials with appropriate particle size can be screened. At the same time, when a part of the screening cylinder rotates to a high position, some of the stuck negative electrode materials will fall back into the grinding chamber due to gravity, preventing the screen holes from being blocked and improving the efficiency of discharging;

[0015] 2. By setting up the planetary gear set transmission, the speed of the screening drum is lower than that of the drum, which reduces the situation of material jamming due to centrifugal force and further improves the efficiency of material discharge;

[0016] 3. By setting up the vibration component, the negative electrode materials with large particle size and stuck in the screening cylinder are re-vibrated and put into the cylinder for grinding, which further improves the discharge efficiency;

[0017] 4. The grinding efficiency of the steel balls can be improved by setting the rotation direction of the drum to be opposite to that of the screw shaft;

[0018] 5. Set up an automatic feeding port and an automatic discharging port to make the working process smoother and improve work efficiency.

[0019] In summary, the device has the advantages of smooth operation and high efficiency, and is particularly suitable for the technical field of negative electrode materials for lithium-ion batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is a structural schematic diagram of a ball milling device for negative electrode materials;

[0022] Figure 2 A cross-sectional view of a ball milling device for negative electrode materials Figure 1 ;

[0023] Figure 3 is a schematic diagram of the structure of the cage;

[0024] Figure 4 A cross-sectional view of a ball milling device for negative electrode materials Figure 2 ;

[0025] Figure 5 It is a partial diagram of the screening cylinder;

[0026] Figure 6 is a schematic diagram of the structure of the shell;

[0027] Figure 7 It is a schematic diagram of the structure of the oscillation component.

[0028] The attached drawings are marked as follows: 1. Base; 2. Oscillating assembly; 21. Oscillator; 22. Shock absorber; 23. Hammer; 24. Roller; 3. Grinding mechanism; 31. Driving member; 32. Screw shaft; 33. Roller; 331. First ring gear; 34. Housing; 35. Motor; 351. Mounting seat; 352. Motor gear; 4. Screening mechanism; 41. Screening cylinder; 5. Grinding chamber; 51. Retaining frame; 52. Steel ball; 6. Feed inlet; 61. Discharge port; 62. Feed nozzle; 7. Second ring gear; 71. Sun gear; 72. Planetary gear.

[0029] The technical solutions in the embodiments of the present utility model are clearly and completely described below in conjunction with the accompanying drawings. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] Embodiment 1:

[0034] like Figures 1 to 7 As shown, a negative electrode material ball milling and pulverizing equipment comprises: a base 1, a grinding mechanism 3 and a screening mechanism 4, wherein the grinding mechanism 3 is provided with a feed port 6 at one end and a discharge port 61 at the other end, wherein the grinding mechanism 3 promotes stirring and pulverizing the negative electrode material, wherein the screening mechanism 4 is provided above the discharge port 61, wherein the screening mechanism 4 sieves out the negative electrode material having a suitable particle size after pulverization, wherein the screening mechanism 4 comprises a screening drum 41, wherein the screening drum 41 is rotatably provided on the grinding mechanism 3, wherein the side wall of the screening drum 41 is evenly distributed with a plurality of sieving holes arranged through the same, wherein when the sieving drum 41 rotates, the sieving holes of the sieving drum 41 participating in filtering and sieving the negative electrode material are switched.

[0035] like Figures 1 to 6 As shown, the grinding mechanism 3 includes a driving member 31, a screw shaft 32, a roller 33, a housing 34 and a motor 35. The driving member 31 is arranged on the base 1 near the discharge port 61. The screw shaft 32 is rotatably arranged on the base 1. One end of the screw shaft 32 is connected to the driving member 31. The roller 33 is coaxially arranged on the screw shaft 32. The outer sleeve of the roller 33 is provided with a first gear ring 331. The side of the roller 33 away from the driving member 31 is provided with a feed port 6. A feed nozzle 62 connected to the feed port 6 is installed on the base 1 at the feed port 6. The screening drum 41 and the roller 33 form a grinding chamber 5. A plurality of The outer shell 34 is connected with the drum 33 in a rolling seal, a retaining frame 51 is arranged between the drum 33 and the screening drum 41, the outer shell 34 is fixedly arranged on the base 1, the discharge port 61 is arranged at the bottom of the outer shell 34, the discharge port 61 is in an inverted step-type, and the screening drum 41 is rotatably installed in the outer shell 34, the motor 35 is arranged on one side of the drum 33, and a mounting seat 351 is arranged at the bottom of the motor, a motor gear 352 is arranged on the rotating shaft of the motor 35, the motor gear 352 is meshed with the first gear ring 331 to drive the drum 33 to rotate, and the rotation direction of the drum 33 is opposite to the rotation direction of the screw shaft 32.

[0036] It is worth mentioning here that by setting the rotation direction of the drum 33 to be opposite to the rotation direction of the screw shaft 32, the grinding efficiency of the steel balls 52 is improved; by setting the retaining frame 51, the friction force in the contact area when the drum 33 and the screening drum 41 rotate at differential speeds is reduced; the inverted step-shaped discharge port 61 makes it easier to collect the screened negative electrode material at the bottom.

[0037] It should be further explained that when the feed nozzle 62 rotates with the roller 33 to the bottom of the screw shaft 32, the feed nozzle 62 is connected to the feed port 6 to achieve automatic intermittent feeding, and the feed port 6 extends upward and outward, and material backflow will not occur.

[0038] like Figure 2 As shown, the screw shaft 32 has a spiral structure, and the screw shaft 32 rotates to push the negative electrode material to move.

[0039] It is worth mentioning that the spiral structure of the shaft body can stir and push the material while not being easily damaged by the steel balls in the grinding chamber 5 .

[0040] like Figure 1 As shown in Figures , 2, and 6, the rotation speed V1 of the screening drum 41 and the rotation speed V2 of the drum 33 satisfy the relationship: 25*V1≤V2≤40*V1.

[0041] like Figure 1 As shown in FIG. 5, the screening drum 41 is connected to the screw shaft 32 through a planetary gear set, which includes a second ring gear 7, a sun gear 71 and a planetary gear 72. The second ring gear 7 is coaxially fixedly mounted on the screening drum 41, and the sun gear 71 is sleeved on the screw shaft 32. The planetary gear 72 is installed between the second ring gear 7 and the sun gear 71. The planetary gear 72 is connected to the second ring gear 7 and the sun gear 71, and the planetary gear 72 is mounted on the housing 34 through a self-rotating mounting plate.

[0042] It is worth mentioning that by providing the second ring gear 7, the planetary gear 72 and the sun gear 71, the rotation speed of the screening drum 41 is lower than that of the drum 33, thereby reducing the possibility of material jamming due to centrifugal force and further improving the efficiency of material discharge.

[0043] like Figure 2 As shown in Figure 7, the screening mechanism 4 also includes an oscillation component 2, which is arranged on the top of the shell 34, and the oscillation component 2 strikes the screening cylinder 41.

[0044] like Figure 2As shown in FIG. 7 , the oscillation assembly 2 includes an oscillator 21, a shock absorber 22, a hammer 23 and a roller 24. The oscillator 21 is fixedly mounted on the top of the housing 34. The shock absorber 22 is arranged between the bottom of the oscillator 21 and the top of the European housing 34. The hammer 23 is arranged on the oscillator 21. The bottom of the hammer 23 vibrates against the screening drum 41 through the rotating roller 24, and the roller 24 is made of rubber material.

[0045] It is worth mentioning here that, by providing the oscillating component 2, the negative electrode materials with large particle size and stuck in the screening cylinder are re-oscillated into the cylinder for grinding, which further improves the discharge efficiency.

[0046] It should be further explained that the roller made of rubber material reduces the friction when contacting the rotating screening drum 41 , thereby avoiding damage to the screening drum 41 .

[0047] The working process is as follows:

[0048] The worker turns on the switch, and the negative electrode material that has been crushed in the previous step enters the grinding chamber 5 from the feed port 6 through the feed port 62. The grinding mechanism 3 starts to work, the driver 31 drives the screw shaft 32 to rotate, and the motor drives the roller 33 to rotate in the opposite direction to the screw shaft. The screening drum 41 rotates differentially with the roller 33 driven by the planetary gears 72 and the sun gear 71. The steel balls 52 in the grinding chamber 5 start to move driven by the grinding mechanism, and begin to rub and wear the negative electrode material. Under the push of the screw shaft 32, the material moves toward the screening mechanism 4, and the negative electrode material ground to a suitable particle size by the steel balls 52 is screened out from the screening drum 41, and finally discharged from the discharge port 61 below the outer shell 34.

[0049] During the screening process, the screen holes may be clogged with material. When a certain part of the screening cylinder 41 rotates to a high position, the negative electrode material stuck in that part will fall back into the grinding chamber 5 due to gravity. The oscillation component 2 arranged on the top of the shell 34 contacts the part of the screening cylinder 41 that rotates to the top through the roller 24, and transmits the vibration, so that the negative electrode material with large particle size and stuck in the screening cylinder 41 is re-oscillated into the grinding chamber 5 for grinding.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A negative electrode material ball milling device, comprising a base (1), characterized in that: Also includes: A grinding mechanism (3) and a screening mechanism (4); The grinding mechanism (3) is provided with a feed port (6) at one end and a discharge port (61) at the other end, and the grinding mechanism (3) promotes stirring and crushing the negative electrode material; The screening mechanism (4) is arranged above the material discharge port (61), and the screening mechanism (4) screens out the negative electrode material having a suitable particle size after being crushed. The screening mechanism (4) comprises a screening cylinder (41); The screening drum (41) is rotatably mounted on the grinding mechanism (3), and a plurality of screening holes are evenly distributed on the side wall of the screening drum (41) and are arranged through the side wall. When the screening drum (41) rotates, the screening holes of the screening drum (41) that participate in filtering and screening the negative electrode material are switched.

2. The negative electrode material ball milling equipment according to claim 1, characterized in that: The grinding mechanism (3) comprises a driving member (31), a screw shaft (32), a roller (33), a housing (34) and a motor (35); The driving member (31) is arranged on a side of the base (1) close to the discharge port (61); The screw shaft (32) is rotatably disposed on the base (1), and one end of the screw shaft (32) is connected to the driving member (31); The roller (33) is coaxially arranged on the screw shaft (32); the outer shell of the roller (33) is provided with a first gear ring (331); a feed port (6) is provided on a side of the roller (33) away from the driving member (31); a feed nozzle (62) connected to the feed port (6) is installed on the base (1) at the feed port (6); the screening drum (41) and the roller (33) form a grinding chamber (5); a plurality of steel balls (52) are provided in the grinding chamber (5); The outer shell (34) is connected to the drum (33) in a rolling sealing manner, a retaining frame (51) is provided between the drum (33) and the screening drum (41), the outer shell (34) is fixedly provided on the base (1), the discharge port (61) is provided at the bottom of the outer shell (34), the discharge port (61) is in an inverted step-shaped shape, and the screening drum (41) is rotatably installed in the outer shell (34); The motor (35) is arranged on one side of the drum (33); a mounting seat (351) is arranged at the bottom of the motor; a motor gear (352) is arranged on the rotating shaft of the motor (35); the motor gear (352) meshes with the first gear ring (331) to drive the drum (33) to rotate; the rotation direction of the drum (33) is opposite to that of the screw shaft (32).

3. The negative electrode material ball milling equipment according to claim 2, characterized in that: The shaft body of the screw shaft (32) adopts a spiral structure, and the screw shaft (32) rotates to drive the negative electrode material to move.

4. The negative electrode material ball milling equipment according to claim 2, characterized in that: The rotation speed V1 of the screening drum (41) and the rotation speed V2 of the drum (33) satisfy the relationship: 25*V1≤V2≤40*V1.

5. The negative electrode material ball milling equipment according to claim 3, characterized in that: The screening drum (41) is connected to the screw shaft (32) via a planetary gear set, wherein the planetary gear set comprises a second ring gear (7), a sun gear (71) and planetary gears (72); The second gear ring (7) is coaxially fixedly mounted on the screening drum (41); the sun gear (71) is sleeved and mounted on the screw shaft (32); the planetary gear (72) is mounted between the second gear ring (7) and the sun gear (71); the planetary gear (72) is transmission-connected between the second gear ring (7) and the sun gear (71); and the planetary gear (72) is mounted on the housing (34) via a self-rotating mounting plate.

6. The negative electrode material ball milling equipment according to claim 1, characterized in that: The screening mechanism (4) further comprises an oscillating component (2), wherein the oscillating component (2) is arranged on the top of the housing (34), and the oscillating component (2) strikes the screening cylinder (41).

7. The negative electrode material ball milling equipment according to claim 6, characterized in that: The oscillating assembly (2) comprises an oscillator (21), a shock absorber (22), a hammer (23) and a roller (24); The oscillator (21) is fixedly mounted on the top of the housing (34); The shock absorber (22) is arranged between the bottom of the oscillator (21) and the top of the European housing (34); The hammer (23) is arranged on the oscillator (21), and the bottom of the hammer (23) vibrates against the screening drum (41) through a rotatably arranged roller (24), wherein the roller (24) is made of rubber material.

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