High-capacity graphene battery negative electrode preparation device and preparation method

Abstract

The invention relates to the field of graphene battery production, in particular to a high-capacity graphene battery negative electrode preparation device and method, the high-capacity graphene battery negative electrode preparation device comprises a grinding box, a power box is mounted above the grinding box, a screen box is mounted on one side above the grinding box, and the screen box is communicated with the interior of the grinding box. The power of the motor is transmitted to the screen frame and the crushing barrel to crush and screen materials, the motor can transmit the power to the grinding barrel below, the grinding barrel grinds the graphene battery negative electrode preparation materials, and the size of screen hole gaps can be controlled by changing the positions of the first screen plate and the second screen plate; by means of the structure, it can be guaranteed that the graphene battery negative electrode preparation materials can be evenly ground, crushing, screening and grinding are conducted synchronously, the grinding efficiency is improved, the equipment does not need multiple sets of power sources, the structure is simple, the production difficulty and cost are low, and the equipment is suitable for large-scale popularization and application. And the use cost is reduced.

Description

Technical Field

[0001] The invention relates to the field of graphene battery production, and in particular to a device and method for preparing a high-capacity graphene battery negative electrode. Background Art

[0002] Graphene battery is a new type of battery technology, which is developed by utilizing the characteristics of lithium ions moving rapidly and in large quantities between the graphene surface and the electrode. At present, most of the so-called graphene batteries on the market are lithium batteries and other batteries that add some graphene through technical means. Therefore, it can be considered that graphene battery is just a term, and it is still a lithium-ion battery or other dielectric battery.

[0003] The patent application with announcement number CN214389717U, a negative electrode slurry high-efficiency mixing and stirring device for graphene battery production, includes a drive box and a device body, a reduction motor is installed on the upper side of the drive box, and a carrier plate is installed at the bottom of the drive box, and the carrier plate is fixedly connected to the upper side of the stirring tank, and a jacket is provided on the outside of the stirring tank, and a base is welded at the bottom of the stirring tank, a left stirring structure is installed on the left side of the stirring tank, and a right stirring structure is installed on the right side of the stirring tank, and a first stirring shaft is installed on the right side of the second stirring shaft, and the upper end of the second stirring shaft is fixedly connected to the left transmission gear through the bearing through the carrier plate, and the upper end of the first stirring shaft is fixedly connected to the right transmission gear through the bearing through the carrier plate. The negative electrode slurry high-efficiency mixing and stirring device for graphene battery production improves the effect of stirring the raw materials under the joint action of the right stirring structure and the left stirring structure, and greatly improves the rate of mixing the raw materials inside the device body.

[0004] In the preparation process of existing graphene batteries, various materials are mixed and stirred into a slurry and then applied to the surface of copper foil to complete the process of making the negative electrode of the graphene battery. However, in the preparation process of existing materials, they need to be screened and finely ground so that the materials meet the mixing standards of the slurry. The existing screening and grinding processes are relatively cumbersome and require multiple sets of equipment to work together, which greatly reduces the processing efficiency of raw materials. In addition, it is impossible to know whether the fineness of the material meets the processing standards during the grinding process. The grinding process can only be completed by setting a standard grinding process time, which may cause the internal part to be not ground properly, thereby reducing the efficiency and quality of the preparation of the negative electrode of the graphene battery.

[0005] Therefore, it is necessary to invent a high-capacity graphene battery negative electrode preparation device and preparation method to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to provide a high-capacity graphene battery negative electrode preparation device and preparation method, by placing the material on a crushing and screening assembly for crushing and screening, and then falling onto the top of the sieve plate one below, and the sieve plate two rotates along the bottom of the sieve plate one, so that the size of the sieve hole gap is adjusted, thereby achieving the effect of corresponding adjustment according to the requirements of the grinding particle size, so as to solve the problems of low efficiency and difficult quality assurance of material grinding in the prior art.

[0007] In order to achieve the above object, the present invention provides the following technical solution: a high-capacity graphene battery negative electrode preparation device, comprising a grinding box, a power box is installed above the grinding box, a screen box is installed on one side above the grinding box, and the screen box is connected to the inside of the grinding box, a feed inlet is opened above the screen box, and a discharge port is opened at the bottom of the grinding box;

[0008] The crushing and screening assembly arranged inside the screen box includes a crushing cylinder, which is symmetrically rotatably connected inside the screen box, and two groups of the crushing cylinders are connected to one side of the shaft with circular gears, and the two groups of circular gears are meshed with each other;

[0009] The driving assembly disposed in the power box includes a motor, and the motor is mounted above the power box;

[0010] The grinding assembly arranged in the grinding box includes a sieve plate 1, which is installed on the inner wall of the grinding box. A sieve plate 2 is rotatably connected below the sieve plate 1, and the sieve holes of the sieve plate 2 and the sieve plate 1 overlap with each other. A paddle is installed on one side of the sieve plate 2, and the paddle is slidably connected to the inner wall of the grinding box.

[0011] As a preferred embodiment of the present invention, the crushing and screening assembly also includes a screen frame, which is arranged at the penetration point between the screen box and the grinding box, and the screen frame and the crushing barrel are vertically arranged up and down, and multiple groups of limit rods are installed on one side of the screen frame, and the limit rods are connected with the inner wall of the screen box.

[0012] As a preferred solution of the present invention, a spring is sleeved on the limit rod, and both sides of the spring are respectively in contact with the inner wall of the screen box and the screen frame. A plurality of push rods are installed on the side of the screen box away from the limit rod, and the push rods are through-connected with the inner wall of the screen box.

[0013] As a preferred solution of the present invention, the driving assembly also includes a bevel gear 1, and the bevel gear 1 is axially connected to the output end of the motor, the bevel gear 1 is rotatably connected in the power box, the top of the grinding box is rotatably connected with a driving shaft, a bevel gear 2 is installed on one side of the driving shaft, and the bevel gear 2 is meshed with the bevel gear 1, an elliptical protrusion is sleeved and fixed on the driving shaft, and the number of the elliptical protrusions is the same as that of the push rod, and they are in the same horizontal position.

[0014] As a preferred solution of the present invention, a belt transmission structure is installed on the driving shaft, and one side of the belt transmission structure is connected to a group of crushing barrel shafts. The belt transmission structure includes a group of belts and two groups of pulleys, the two groups of pulleys are respectively connected to the driving shaft and a group of crushing barrels, and a belt is installed between the two groups of pulleys.

[0015] As a preferred embodiment of the present invention, the grinding assembly also includes a connecting shaft, which is rotatably connected between the screen plate and the grinding box, and is axially connected to a bevel gear. A limiting ring is fixedly sleeved on the connecting shaft, and a plurality of guide grooves are symmetrically provided on the surface of the connecting shaft.

[0016] As a preferred solution of the present invention, a sleeve is sleeved on the connecting shaft, a plurality of guide blocks are symmetrically installed on the inner wall of the sleeve, and the guide blocks are slidably connected to the corresponding guide grooves, a second spring is sleeved on the connecting shaft, and the two sides of the second spring are respectively fitted with the sleeve and the limit ring.

[0017] As a preferred solution of the present invention, four groups of grinding cylinders are rotatably connected to the sleeve in a ring shape, one side of the grinding cylinder is rotatably connected to a fixed seat, an annular slide rail is installed on the inner wall of the grinding box, four groups of sliding seats are slidably connected in the annular slide rail, and spring telescopic rods are installed between the four groups of sliding seats and the corresponding fixed seats.

[0018] A method for preparing a negative electrode of a high-capacity graphene battery comprises the above-mentioned device for preparing a negative electrode of a high-capacity graphene battery, and the specific processing steps are as follows:

[0019] S1: After the material prepared by the negative electrode of the graphene battery is put into the feed port, the motor is started to rotate the crushing cylinders, so that the agglomerated materials can be crushed and fall into the screen frame below. The screen frame can swing left and right under the drive of the motor to complete the screening work;

[0020] S2: At this time, the sieve plate 2 rotates along the bottom of the sieve plate 1, thereby changing the position of the two groups of sieve holes, making the gaps in the sieve holes smaller. When the screened material for preparing the negative electrode of the graphene battery falls onto the surface of the sieve plate 1, the grinding cylinder can roll and crush it. When the particle size of the material meets the gap of the sieve holes, it will automatically fall into the bottom of the grinding box for storage, thereby completing the entire grinding work.

[0021] In the above technical solution, compared with the prior art, the technical effects and advantages provided by the present invention are as follows:

[0022] By transmitting the power of the motor to the screen frame and the crushing cylinder, the crushing and screening of the graphene battery negative electrode preparation material can be achieved, paving the way for the grinding below, and the motor can transmit power to the grinding cylinder below, so that the grinding cylinder can grind the graphene battery negative electrode preparation material along the screen plate one, and when the ground particle size meets the composite standard, it can automatically fall along the screen hole, and the position of the screen plate one and the screen plate two can be changed to control the size of the screen hole gap, so as to grind materials with different particle size requirements. This structure can ensure that the graphene battery negative electrode preparation material can be evenly ground, and the crushing, screening and grinding are carried out simultaneously, which improves the grinding efficiency, and this equipment does not require multiple power sources, and has a simple structure, low production difficulty and cost, thereby reducing the cost of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a schematic diagram of the elliptical convex block layout structure of the present invention;

[0026] Figure 3 It is a schematic diagram of the slicing structure of the screen box of the present invention;

[0027] Figure 4 It is a schematic diagram of the layout structure of the grinding cylinder of the present invention;

[0028] Figure 5 It is a schematic diagram of the planing structure of the grinding box of the present invention;

[0029] Figure 6 For the present invention Figure 3 The enlarged structural diagram at A in the middle;

[0030] Figure 7 For the present invention Figure 5 The enlarged structural diagram at B in the middle;

[0031] Figure 8 For the present invention Figure 5 Enlarged structural diagram at point C in the middle.

[0032] Description of reference numerals:

[0033] 001, grinding box; 101, power box; 102, screen box; 103, feed port; 104, discharge port; 002, crushing and screening assembly; 201, crushing cylinder; 202, circular gear; 203, screen frame; 204, limit rod; 205, spring 1; 206, push rod; 003, drive assembly; 301, motor; 302, bevel gear 1; 303, bevel gear 2; 304, drive shaft; 30 5. Elliptical convex block; 306. Belt drive structure; 004. Grinding assembly; 401. Screen plate one; 402. Screen plate two; 403. Paddle; 404. Connecting shaft; 405. Limiting ring; 406. Guide groove; 407. Sleeve; 408. Guide block; 409. Spring two; 410. Grinding cylinder; 411. Fixed seat; 412. Annular slide rail; 413. Sliding seat; 414. Spring telescopic rod. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0035] The present invention provides Figure 1-8 A high-capacity graphene battery negative electrode preparation device shown includes a grinding box 001, a power box 101 is installed above the grinding box 001, a screen box 102 is installed on one side above the grinding box 001, and the screen box 102 is connected to the inside of the grinding box 001, a feed inlet 103 is opened above the screen box 102, and a discharge port 104 is opened at the bottom of the grinding box 001;

[0036] The graphene battery negative electrode preparation material is placed into the screen box 102 through the feed port 103 , and the graphene battery negative electrode preparation material can continue to be transported downward to the grinding box 001 through the screen box 102 , and finally the graphene battery negative electrode preparation material can be transported out of the grinding box 001 through the discharge port 104 .

[0037] The crushing and screening assembly 002 disposed inside the screen box 102 includes a crushing cylinder 201, which is symmetrically rotatably connected inside the screen box 102, and two sets of crushing cylinders 201 are connected to one side of the shaft with a circular gear 202, and the two sets of circular gears 202 are meshed with each other;

[0038] The two groups of crushing barrels 201 can be driven mutually by the two groups of circular gears 202, thereby ensuring the crushing effect of the crushing barrels 201 on the negative electrode materials of the graphene battery.

[0039] The driving assembly 003 disposed in the power box 101 includes a motor 301, and the motor 301 is installed above the power box 101;

[0040] The drive of the motor 301 can provide power for the entire device.

[0041] The grinding assembly 004 arranged in the grinding box 001 includes a sieve plate 401, which is installed on the inner wall of the grinding box 001. A sieve plate 402 is rotatably connected to the lower side of the sieve plate 401, and the sieve holes of the sieve plate 402 and the sieve plate 401 overlap with each other. A paddle 403 is installed on one side of the sieve plate 402, and the paddle 403 is slidably connected to the inner wall of the grinding box 001.

[0042] By moving the paddle 403, the sieve plate 2 402 can be rotated under the sieve plate 1 401, so that the sieve holes of the sieve plate 2 402 and the sieve plate 1 401 are misaligned, thereby reducing the gap between the sieve holes and achieving the effect of controlling the particle size of the graphene battery negative electrode material required.

[0043] Furthermore, in the above structure, the crushing and screening assembly 002 also includes a screen frame 203, which is arranged at the penetration point between the screen box 102 and the grinding box 001, and the screen frame 203 and the crushing cylinder 201 are vertically arranged up and down, and multiple groups of limit rods 204 are installed on one side of the screen frame 203, and the limit rods 204 are connected to the inner wall of the screen box 102.

[0044] The screen frame 203 can receive the graphene battery negative electrode material crushed by the crushing drum 201 and screen the material.

[0045] Furthermore, in the above structure, a spring 205 is sleeved on the limit rod 204, and the two sides of the spring 205 are respectively in contact with the inner wall of the screen box 102 and the screen frame 203, and a plurality of push rods 206 are installed on the side of the screen box 102 away from the limit rod 204, and the push rods 206 are through-connected with the inner wall of the screen box 102.

[0046] The push rod 206 can push the screen frame 203 to move, so that the limit rod 204 moves along the inner wall of the screen box 102, so that the spring 1 205 is squeezed, and the spring 1 205 can reset the screen frame 203, so that the screen frame 203 can swing left and right to achieve the effect of screening.

[0047] Furthermore, in the above structure, the driving component 003 also includes a bevel gear 302, which is rotatably connected in the power box 101, and the bevel gear 302 is axially connected to the output end of the motor 301. The top of the grinding box 001 is rotatably connected to the driving shaft 304, and a bevel gear 2 303 is installed on one side of the driving shaft 304, and the bevel gear 2 303 is meshed with the bevel gear 1 302. An elliptical protrusion 305 is sleeved and fixed on the driving shaft 304, and the number of the elliptical protrusion 305 is the same as that of the push rod 206, and they are in the same horizontal position.

[0048] Through the cooperation of bevel gear 1 302 and bevel gear 2 303 , the motor 301 can transmit power to the drive shaft 304 , so that the drive shaft 304 drives the elliptical protrusion 305 to rotate. Through the special shape of the elliptical protrusion 305 , the elliptical protrusion 305 pushes the push rod 206 on one side to move.

[0049] Furthermore, in the above structure, a belt transmission structure 306 is installed on the driving shaft 304, and one side of the belt transmission structure 306 is axially connected to a group of crushing barrels 201. The belt transmission structure 306 includes a group of belts and two groups of pulleys. The two groups of pulleys are respectively connected to the driving shaft 304 and a group of crushing barrels 201, and a belt is installed between the two groups of pulleys.

[0050] The driving shaft 304 can drive a group of crushing drums 201 to rotate through the belt transmission structure 306 , so that the motor 301 can transmit power to the crushing drums 201 .

[0051] Furthermore, in the above structure, the grinding assembly 004 also includes a connecting shaft 404, which is rotatably connected between the screen plate 401 and the grinding box 001, and the connecting shaft 404 is axially connected to the bevel gear 302, a limiting ring 405 is fixedly sleeved on the connecting shaft 404, and a plurality of guide grooves 406 are symmetrically provided on the surface of the connecting shaft 404.

[0052] The connecting shaft 404 can be driven to rotate by the bevel gear 1 302 .

[0053] Furthermore, in the above structure, a sleeve 407 is sleeved on the connecting shaft 404, a plurality of guide blocks 408 are symmetrically installed on the inner wall of the sleeve 407, and the guide blocks 408 are slidably connected with the corresponding guide grooves 406, a spring 409 is sleeved on the connecting shaft 404, and the two sides of the spring 409 are respectively fitted with the sleeve 407 and the limit ring 405.

[0054] Through the cooperation of the guide block 408 and the guide groove 406 , the sleeve 407 can slide up and down along the connecting shaft 404 , and the spring 409 can maintain the position of the sleeve 407 .

[0055] Furthermore, in the above structure, four groups of grinding cylinders 410 are rotatably connected to the sleeve 407 in a ring shape, one side of the grinding cylinder 410 is rotatably connected to a fixed seat 411, an annular slide rail 412 is installed on the inner wall of the grinding box 001, four groups of sliding seats 413 are slidably connected in the annular slide rail 412, and a spring telescopic rod 414 is installed between the four groups of sliding seats 413 and the corresponding fixed seats 411.

[0056] The sleeve 407 is driven to rotate by the connecting shaft 404, so that the grinding cylinder 410 can roll along the surface of the screen plate 401, and the sliding seat 413 can slide along the annular slide rail 412, and the cooperation of the spring telescopic rod 414 and the spring 2 409 can make the grinding cylinder 410 fit firmly with the surface of the screen plate 401.

[0057] A method for preparing a negative electrode of a high-capacity graphene battery comprises the above-mentioned device for preparing a negative electrode of a high-capacity graphene battery, and the specific processing steps are as follows:

[0058] S1: After the material prepared by the negative electrode of the graphene battery is put into the feed port 103, the motor 301 is started to rotate the crushing cylinder 201, so that the agglomerated material can be crushed and fall into the screen frame 203 below, and the screen frame 203 can swing left and right under the drive of the motor 301, thereby completing the screening work;

[0059] S2: At this time, the sieve plate 2 402 rotates along the bottom of the sieve plate 1 401, thereby changing the positions of the two groups of sieve holes, making the gaps of the sieve holes smaller. When the screened material for preparing the negative electrode of the graphene battery falls onto the surface of the sieve plate 1 401, the grinding cylinder 410 can roll and crush it. When the particle size of the material meets the gap of the sieve holes, it will automatically fall into the bottom of the grinding box 001 for storage, thereby completing the entire grinding work.

[0060] like Figure 1-8As shown, the bevel gear 1 302 is driven to rotate by the motor 301, so that the bevel gear 1 302 drives the bevel gear 2 303 to rotate, and the elliptical protrusion 305 and the belt transmission structure 306 are driven to rotate by the driving shaft 304, so that the two groups of crushing barrels 201 rotate with each other, and at this time, the graphene battery negative electrode preparation material can be transported to the screen box 102 through the feed port 103, and the graphene battery negative electrode preparation material can be crushed by the two groups of crushing barrels 201, and the lower screen frame 203 can receive the crushed graphene battery negative electrode preparation material. At this time, the elliptical protrusion 305 squeezes the push rod 206, so that the screen frame 203 moves and squeezes the spring 1 205 on one side. When the elliptical protrusion 305 is separated from the push rod 206, the screen frame 203 is reset by the spring 1 205, so that the graphene battery negative electrode preparation material is screened and falls above the screen plate 1 401, and The sieve plate 1 401 and the sieve plate 2 402 can be moved by the paddle 403 to adjust the size of the sieve holes. At this time, the grinding cylinder 410 is driven to rotate by the connecting shaft 404, so that the graphene battery negative electrode preparation material is ground and squeezed. When the ground graphene battery negative electrode preparation material powder is completed, it will fall down into the grinding box 001 along the sieve hole gap in the sieve plate 1 401 and the sieve plate 2 402, and with the subsequent graphene battery negative electrode preparation material powder entering, the sieve holes will not be blocked. The paddle 403 drives the sieve plate 2 402 to move along the bottom of the sieve plate 1 401, which can further avoid the occurrence of blockage. Through this structure, it can be ensured that the graphene battery negative electrode preparation material can be evenly ground, and the crushing, screening and grinding are carried out simultaneously, which improves the grinding efficiency. In addition, this equipment has a simple structure, and its production difficulty and production cost are relatively low, which reduces the cost of use.

[0061] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A high-capacity graphene battery negative electrode preparation device, comprising a grinding box (001), characterized in that: A power box (101) is installed above the grinding box (001), a screen box (102) is installed on one side above the grinding box (001), and the screen box (102) is connected to the inside of the grinding box (001), a feed inlet (103) is provided above the screen box (102), and a discharge outlet (104) is provided at the bottom of the grinding box (001); The crushing and screening assembly (002) disposed inside the screen box (102) comprises a crushing cylinder (201), the crushing cylinder (201) being symmetrically rotatably connected inside the screen box (102), two groups of the crushing cylinders (201) having one side shaft connected to a circular gear (202), and the two groups of circular gears (202) being meshed with each other; The driving assembly (003) disposed in the power box (101) comprises a motor (301), wherein the motor (301) is installed above the power box (101); The grinding assembly (004) disposed in the grinding box (001) comprises a sieve plate 1 (401), wherein the sieve plate 1 (401) is mounted on the inner wall of the grinding box (001), a sieve plate 2 (402) is rotatably connected below the sieve plate 1 (401), and the sieve holes of the sieve plate 2 (402) and the sieve plate 1 (401) overlap with each other, and a paddle (403) is mounted on one side of the sieve plate 2 (402), and the paddle (403) is slidably connected to the inner wall of the grinding box (001).

2. A high-capacity graphene battery negative electrode preparation device according to claim 1, characterized in that: The crushing and screening assembly (002) further comprises a screen frame (203), wherein the screen frame (203) is arranged at the through-point between the screen box (102) and the grinding box (001), and the screen frame (203) and the crushing cylinder (201) are arranged vertically up and down, and a plurality of groups of limit rods (204) are installed on one side of the screen frame (203), and the limit rods (204) are connected through the inner wall of the screen box (102).

3. A high-capacity graphene battery negative electrode preparation device according to claim 2, characterized in that: A spring (205) is sleeved on the limit rod (204), and the two sides of the spring (205) are respectively in contact with the inner wall of the screen box (102) and the screen frame (203). A plurality of push rods (206) are installed on the side of the screen box (102) away from the limit rod (204), and the push rods (206) are connected to the inner wall of the screen box (102).

4. A high-capacity graphene battery negative electrode preparation device according to claim 1, characterized in that: The driving assembly (003) further comprises a bevel gear 1 (302), wherein the bevel gear 1 (302) is rotatably connected in the power box (101), and the bevel gear 1 (302) is axially connected to the output end of the motor (301); the top of the grinding box (001) is rotatably connected to a driving shaft (304), a bevel gear 2 (303) is mounted on one side of the driving shaft (304), and the bevel gear 2 (303) is meshed with the bevel gear 1 (302); an elliptical protrusion (305) is sleeved and fixed on the driving shaft (304), and the number of the elliptical protrusions (305) is the same as that of the push rod (206), and they are in the same horizontal position.

5. A high-capacity graphene battery negative electrode preparation device according to claim 4, characterized in that: A belt transmission structure (306) is installed on the driving shaft (304), and one side of the belt transmission structure (306) is axially connected to a group of crushing barrels (201). The belt transmission structure (306) comprises a group of belts and two groups of pulleys, the two groups of pulleys are respectively connected to the driving shaft (304) and the group of crushing barrels (201), and a belt is installed between the two groups of pulleys.

6. A high-capacity graphene battery negative electrode preparation device according to claim 1, characterized in that: The grinding assembly (004) further comprises a connecting shaft (404), wherein the connecting shaft (404) is rotatably connected between the screen plate 1 (401) and the grinding box (001), and the connecting shaft (404) is axially connected to the bevel gear 1 (302), a limiting ring (405) is sleeved and fixed on the connecting shaft (404), and a plurality of guide grooves (406) are symmetrically provided on the surface of the connecting shaft (404).

7. A high-capacity graphene battery negative electrode preparation device according to claim 6, characterized in that: The connecting shaft (404) is sleeved with a sleeve (407), and a plurality of guide blocks (408) are symmetrically mounted on the inner wall of the sleeve (407), and the guide blocks (408) are slidably connected to the corresponding guide grooves (406). The connecting shaft (404) is sleeved with a second spring (409), and the two sides of the second spring (409) are respectively fitted with the sleeve (407) and the limit ring (405).

8. A high-capacity graphene battery negative electrode preparation device according to claim 7, characterized in that: The sleeve (407) is rotatably connected to four groups of grinding cylinders (410) in a ring shape, and one side of the grinding cylinder (410) is rotatably connected to a fixed seat (411). An annular slide rail (412) is installed on the inner wall of the grinding box (001), and four groups of sliding seats (413) are slidably connected inside the annular slide rail (412). Spring telescopic rods (414) are installed between the four groups of sliding seats (413) and the corresponding fixed seats (411).

9. A method for preparing a negative electrode of a high-capacity graphene battery, comprising a device for preparing a negative electrode of a high-capacity graphene battery according to any one of claims 1 to 8, characterized in that: The processing steps are as follows: S1: After the material prepared from the negative electrode of the graphene battery is put into the feed port (103), the motor (301) is started to rotate the crushing cylinder (201) relative to each other, so that the agglomerated material can be crushed and fall into the screen frame (203) below, and the screen frame (203) can swing left and right under the drive of the motor (301), thereby completing the screening work; S2: At this time, the sieve plate 2 (402) rotates along the bottom of the sieve plate 1 (401), thereby changing the positions of the two groups of sieve holes, making the gaps of the sieve holes smaller. When the screened material for preparing the negative electrode of the graphene battery falls onto the surface of the sieve plate 1 (401), the grinding cylinder (410) can roll and crush it. When the particle size of the material meets the gap of the sieve holes, it will automatically fall into the bottom of the grinding box (001) for storage, thereby completing the entire grinding work.

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