A forming device and method for producing graphite crucible for producing negative electrode material of lithium battery

Abstract

The present invention belongs to the technical field of crucible production, and specifically relates to a forming device and method for a graphite crucible for producing negative electrode materials of lithium batteries, including a base and a top forming template, an outer film tube and a bottom forming template, wherein the top forming template is arranged on the base, a core column is fixed on the base, the top forming template is slidably connected to the core column, the lower end of the outer film tube is connected to the top forming template or the base, and the opening at the lower end of the outer film tube is blocked by the top forming template; the bottom forming template extends into the outer film tube through the opening at the upper end of the outer film tube. In the above structure, the top forming template is located below the bottom forming template, and the core column is fixed on the base; therefore, after pressing and molding, the bottom of the crucible body faces upward, which can avoid damage to the top of the crucible body during demolding; at the same time, during the pressing and molding process, the bottom forming template is moved downward to achieve pressing, which can ensure that the crucible body obtained after pressing is dense, and the overall quality is effectively improved.

Description

Technical Field

[0001] The invention belongs to the technical field of crucible production, and in particular relates to a forming device and method for a graphite crucible for producing negative electrode materials of lithium batteries. Background Art

[0002] The production of graphite negative electrode materials mainly uses Acheson and internal string graphitization furnaces. The graphite negative electrode materials are loaded into graphite crucibles for graphitization treatment, which transforms the carbon atoms from the thermodynamically unstable "two-dimensional disordered overlapping" arrangement to a "three-dimensional ordered overlapping" arrangement.

[0003] With the development of electric vehicles and other electronic devices, lithium batteries have been widely used; the negative electrode materials of lithium batteries require a large number of crucibles in the production process. At present, crucibles are usually produced by pressing; during pressing, the paste used for molding is added into the mold, and then the crucible body is obtained by pressing. However, the methods and devices currently used in pressing can only press single-hole crucibles, and have small loading, low output, poor quality, and high production costs, especially cannot meet the production needs of internal string graphitization furnaces. Summary of the invention

[0004] In view of the above technical problems, the present invention provides a forming device and method for producing a graphite crucible for producing negative electrode materials for lithium batteries.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A forming device for a graphite crucible for producing negative electrode materials for lithium batteries comprises a base and a top forming template, an outer film tube and a bottom forming template, wherein the top forming template is arranged on the base, a core column is fixed on the base, the top forming template is slidably connected to the core column, the lower end of the outer film tube is connected to the top forming template or the base, and the opening at the lower end of the outer film tube is blocked by the top forming template; the bottom forming template extends into the outer film tube through the upper end opening of the outer film tube.

[0007] The lower end of the outer film cylinder is connected to the top forming template or the base through a locking mechanism.

[0008] The locking mechanism includes a locking ring and a first telescopic cylinder. The locking ring is rotatably connected to the base. The two ends of the first telescopic cylinder are respectively hinged to the base and the locking ring. The rotation of the locking ring is driven by the telescopic movement of the first telescopic cylinder. The locking ring is provided with locking teeth, and the lower end of the outer film cylinder is provided with a corresponding protrusion.

[0009] A moving mechanism is provided at the bottom of the base, and the base can be driven to move by moving the moving mechanism.

[0010] It also includes a positioning mechanism, through which the movement of the base can be restricted; the positioning mechanism is a lifting column, the lower end of the lifting column is fixedly connected to the ground, the upper end of the lifting column is provided with a positioning column, and the base is provided with a corresponding positioning hole, and the positioning column can extend into the positioning hole.

[0011] It also includes a frame and a connecting cover, wherein the connecting cover is connected to the frame, and the connecting cover is connected to the outer film cylinder through a second telescopic cylinder, and the two ends of the second telescopic cylinder are respectively fixedly connected or hinged to the connecting cover and the outer film cylinder, and the outer film cylinder can be driven to move through the second telescopic cylinder;

[0012] A hydraulic cylinder is fixed on the connecting cover, and the hydraulic cylinder is connected to the bottom forming template, and the bottom forming template can be driven to move by the hydraulic cylinder.

[0013] The connection cover is connected to the frame via a lifting mechanism, and the lifting mechanism can drive the connection cover to rise and fall; an opening is arranged on the connection cover.

[0014] The outer film cylinder is in the shape of a cylinder or a square cylinder; the core column is in the shape of a cone, and the top of the core column is in the shape of a hemisphere; at least two core columns are provided.

[0015] A method for processing a crucible for a lithium battery negative electrode material comprises the following steps:

[0016] S1, move the top forming template along the core column on the base and place it on the base;

[0017] S2, connecting the outer film cylinder to the base or the top forming template, and sealing the opening at the lower end of the outer film cylinder through the top forming template;

[0018] S3, adding paste into the outer film cylinder;

[0019] S4, after adding the paste, the bottom forming template is driven by a hydraulic cylinder or a press to move and press to form the crucible body;

[0020] S5. Remove the bottom forming template and the outer film cylinder; lift the top forming template and the crucible body by the lifting device to achieve demoulding.

[0021] In S1: the top molding template and the core column are coated with a release agent.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The top forming template is arranged on the base, a core column is fixed on the base, the top forming template is slidably connected to the core column, the lower end of the outer film cylinder is connected to the top forming template or the base, and the opening at the lower end of the outer film cylinder is blocked by the top forming template. After pressing and forming, demoulding can be achieved by lifting the top forming template, which is easy to operate.

[0024] At the same time, in the above structure, the top forming template is located below the bottom forming template, and the core column is fixed on the base; therefore, after pressing and forming, the bottom of the crucible body faces upward, which can avoid damage to the top of the crucible body during demoulding. At the same time, during the pressing and forming process, the bottom forming template is moved downward to achieve pressing, which can ensure that the crucible body obtained after pressing is dense, effectively improving the overall quality.

[0025] The locking mechanism can quickly realize the connection / separation between the lower end of the outer film cylinder and the top forming template or the base, which can improve the convenience and production efficiency during use.

[0026] A moving mechanism is provided at the bottom of the base, which can be used to drive the base to move and can be moved to a designated workstation as needed, facilitating transportation and production.

[0027] A frame, a hydraulic cylinder and a second telescopic cylinder are provided to realize the movement of the outer film cylinder and the bottom forming template, and to realize pressing and separation, thus forming a complete pressing and forming device.

[0028] The core column is conical in shape, and the top of the core column is hemispherical, which can facilitate demoulding and pressing.

[0029] The number of core columns can be determined according to the number of holes on the crucible as required; at least two core columns are provided, and a crucible with multiple holes can be pressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the structure of the present invention;

[0031] Figure 2 It is a schematic diagram of the demoulding state of the present invention;

[0032] Figure 3 It is a structural schematic diagram of the locking mechanism of the present invention;

[0033] Figure 4 yes Figure 3 A partial enlarged view of the middle A;

[0034] Figure 5 It is a structural schematic diagram of the positioning mechanism of the present invention;

[0035] Figure 6 is a cross-sectional view of the present invention;

[0036] Figure 7 yes Figure 6 A partial enlarged view of point B in the middle;

[0037] Among them: 1 is a base, 100 is a positioning hole, 2 is a top forming template, 3 is an outer film cylinder, 300 is a protrusion, 4 is a bottom forming template, 5 is a core column, 6 is a locking mechanism, 600 is a locking ring, 601 is a first telescopic cylinder, 602 is a locking tooth, 7 is a moving mechanism, 8 is a positioning mechanism, 800 is a positioning column, 9 is a frame, 10 is a connecting cover, 1000 is an opening, 11 is a second telescopic cylinder, 12 is a hydraulic cylinder, 13 is a crucible body, and 14 is a lifting mechanism. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] like Figures 1 to 2 As shown, a molding device for a graphite crucible for producing negative electrode materials for lithium batteries includes a base 1 and a top molding template 2, an outer film tube 3 and a bottom molding template 4. The top molding template 2 is arranged on the base 1, and a core column 5 is fixed on the base 1. The top molding template 2 is slidably connected to the core column 5. The lower end of the outer film tube 3 is connected to the top molding template 2 or the base 1, and the opening at the lower end of the outer film tube 3 is blocked by the top molding template 2; the bottom molding template 4 extends into the outer film tube 3 through the upper end opening of the outer film tube 3.

[0040] When in use, the top molding template 2 is slid along the core column 5 and placed on the base 1; then the outer film tube 3 is connected to the top molding template 2 or the base 1 to form a molding cavity; then the paste is added into the outer film tube 3, and the bottom molding template 4 is pressed down by the press to perform compression molding.

[0041] After pressing and molding, the bottom molding template 4 is moved upward to separate the outer film tube 3 from the top molding template 2 or the base 1; finally, the top molding template 2 is lifted by a sling, and the top molding template 2 drives the pressed crucible body 13 to move together during the rising process to achieve demolding.

[0042] The hole of the crucible body 13 can be formed by the core column 5, the top surface of the crucible body 13 can be formed by the top forming template 2, the bottom surface of the crucible body 13 can be formed by the bottom forming template 4, and the outer shape of the crucible body 13 can be formed by the outer film cylinder 3. Therefore, through this structural setting, a well-formed and high-quality crucible body 13 can be obtained.

[0043] Furthermore, in order to facilitate the connection between the outer film tube 3 and the top forming template 2 or the base 1, a corresponding locking mechanism 6 is provided; the locking mechanism 6 can be implemented in a variety of ways, and any one of them can be used as long as it can facilitate the connection between the outer film tube 3 and the top forming template 2 or the base 1.

[0044] Furthermore, the locking mechanism 6 preferably adopts the following structure:

[0045] like Figure 3 and 4 As shown, the locking mechanism 6 includes a locking ring 600 and a first telescopic cylinder 601. The locking ring 600 is rotatably connected to the base 1. The two ends of the first telescopic cylinder 601 are respectively hinged to the base 1 and the locking ring 600. The rotation of the locking ring 600 is driven by the telescopic movement of the first telescopic cylinder 601. The locking ring 600 is provided with locking teeth 602, and the lower end of the outer film tube 3 is provided with a corresponding protrusion 300.

[0046] The outer film tube 3 is placed on the top forming template 2 or the base 1, and then the first telescopic cylinder 601 is extended to drive the locking ring 600 to rotate, and the locking teeth 602 on the locking ring 600 rotate to the top of the protrusion 300 of the outer film tube 3, and the protrusion 300 is blocked by the locking teeth 602, thereby limiting the movement of the outer film tube 3, and then realizing the connection between the outer film tube 3 and the top forming template 2 or the base 1.

[0047] When the first telescopic cylinder 601 retracts, it drives the locking ring 600 to rotate in the opposite direction, and the locking teeth 602 on the locking ring 600 move away from above the protrusion 300 of the outer film tube 3 and no longer block the protrusion 300. At this time, the outer film tube 3 can be separated from the top forming template 2 or the base 1.

[0048] Further, a moving mechanism 7 is provided at the bottom of the base 1, and the base 1 can be driven to move by moving the moving mechanism 7. The transfer of different workstations can be realized, which is convenient for production. The moving mechanism 7 can adopt a common track wheel moving mechanism, a gear rack moving mechanism and other moving mechanisms.

[0049] Further, if Figure 5 As shown, it also includes a positioning mechanism 8, through which the movement of the base 1 can be limited; the positioning mechanism 8 is a lifting column, the lower end of the lifting column is fixedly connected to the ground, and the upper end of the lifting column is provided with a positioning column 800, and the base 1 is provided with a corresponding positioning hole 100, and the positioning column 800 can extend into the positioning hole 100.

[0050] The positioning mechanism 8 is arranged at the corresponding work station as required. When the moving mechanism 7 drives the base 1 to move to the work station, the lifting column rises upward, so that the positioning column 800 on the lifting column extends into the positioning hole 100, thereby playing a positioning role; when the base 1 needs to be moved, the lifting column moves downward, so that the positioning column 800 on the lifting column moves out of the positioning hole 100.

[0051] Further, if Figure 6 and 7 As shown, it also includes a frame 9 and a connecting cover 10, the connecting cover 10 is connected to the frame 9, the connecting cover 10 is connected to the outer film cylinder 3 through a second telescopic cylinder 11, and the two ends of the second telescopic cylinder 11 are respectively fixedly connected or hinged to the connecting cover 10 and the outer film cylinder 3, and the outer film cylinder 3 can be driven to move by the second telescopic cylinder 11;

[0052] A hydraulic cylinder 12 is fixed on the connecting cover 10 , and the hydraulic cylinder 12 is connected to the bottom forming template 4 . The bottom forming template 4 can be driven to move by the hydraulic cylinder 12 .

[0053] When in use, the second telescopic cylinder 11 drives the outer film cylinder 3 to move down and connect with the top forming template 2 or the base 1; after adding the paste, the hydraulic cylinder 12 drives the bottom forming template 4 to move down for pressing; after pressing, the hydraulic cylinder 12 drives the bottom forming template 4 to move up, and the second telescopic cylinder 11 drives the outer film cylinder 3 to move up. Therefore, through this structural setting, pressing and molding can be facilitated.

[0054] Furthermore, the connection cover 10 and the frame 9 may be fixedly connected. Of course, in order to achieve adjustment, a lifting mechanism is provided between the connection cover 10 and the frame 9, and the connection cover 10 may be lifted and lowered by the lifting mechanism, thereby achieving adjustment.

[0055] The lifting mechanism can adopt common lifting structures such as screw lifts, lifting columns, etc.

[0056] Furthermore, the connection cover 10 is sleeved outside the outer film cylinder 3 to improve the integrity, and after pressing, the outer film cylinder 3 can be extended into the connection sleeve to play a protective role.

[0057] Furthermore, an opening 1000 is provided on the connection cover 10, through which materials can be conveniently added into the outer film cylinder 3 on the one hand, and the adding status of the materials can be observed on the other hand.

[0058] Furthermore, the outer film tube 3 is in the shape of a cylinder or a square tube, and can be processed into a square or round crucible.

[0059] Furthermore, the shape of the core column 5 is conical, and the top of the core column 5 is hemispherical, which can facilitate pressing on the one hand and demoulding on the other hand.

[0060] Furthermore, the number and position of the core columns 5 can be set as needed, and a porous crucible can be prepared; if a ten-hole crucible needs to be processed, ten core columns 5 are provided; and the core columns 5 can be adjusted and set accordingly according to the required hole positions and hole diameters.

[0061] A method for processing a crucible for a lithium battery negative electrode material comprises the following steps:

[0062] S1, move the top forming template 2 along the core column 5 on the base 1 and place it on the base 1;

[0063] S2, connecting the outer film cylinder 3 to the base 1 or the top forming template 2, and sealing the opening 1000 at the lower end of the outer film cylinder 3 through the top forming template 2;

[0064] S3, adding paste into the outer film cylinder 3;

[0065] S4, after adding the paste, the bottom forming template 4 is driven by the hydraulic cylinder 12 or the press to move and press to form the crucible body 13;

[0066] S5, remove the bottom forming template 4 and the outer film tube 3; lift the top forming template 2 and the crucible body 13 by the lifting device to achieve demoulding.

[0067] The above processing method can facilitate demoulding and ensure the quality of compression molding.

[0068] Furthermore, in S1: both the top molding template 2 and the core column 5 are coated with a release agent to facilitate demoulding.

[0069] Only the preferred embodiments of the present invention are described in detail above, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention, and various changes should be included in the protection scope of the present invention.

Claims

1. A forming device for a graphite crucible for producing negative electrode materials for lithium batteries, characterized in that: The invention comprises a base (1), a top forming template (2), an outer mold barrel (3) and a bottom forming template (4), wherein the top forming template (2) is arranged on the base (1), a core column (5) is fixed on the base (1), the top forming template (2) is slidably connected to the core column (5), the lower end of the outer mold barrel (3) is connected to the top forming template (2) or the base (1), and the opening at the lower end of the outer mold barrel (3) is blocked by the top forming template (2); the bottom forming template (4) extends into the outer mold barrel (3) through the upper end opening of the outer mold barrel (3); The lower end of the outer mold cylinder (3) is connected to the top molding template (2) or the base (1) via a locking mechanism (6); It also includes a positioning mechanism (8), through which the movement of the base (1) can be restricted; the positioning mechanism (8) is a lifting column, the lower end of the lifting column is fixedly connected to the ground, the upper end of the lifting column is provided with a positioning column (800), and the base (1) is provided with a corresponding positioning hole (100), and the positioning column (800) can extend into the positioning hole (100); It also includes a frame (9) and a connecting cover (10), wherein the connecting cover (10) is connected to the frame (9), and the connecting cover (10) is connected to the outer mold barrel (3) via a second telescopic cylinder (11), and the two ends of the second telescopic cylinder (11) are respectively fixedly connected or hinged to the connecting cover (10) and the outer mold barrel (3), and the outer mold barrel (3) can be driven to move by the second telescopic cylinder (11); A hydraulic cylinder (12) is fixed on the connection cover (10), and the hydraulic cylinder (12) is connected to the bottom forming template (4). The bottom forming template (4) can be driven to move by the hydraulic cylinder (12).

2. The forming device of a graphite crucible for producing negative electrode materials for lithium batteries according to claim 1, characterized in that: The locking mechanism (6) comprises a locking ring (600) and a first telescopic cylinder (601); the locking ring (600) is rotatably connected to the base (1); two ends of the first telescopic cylinder (601) are respectively hinged to the base (1) and the locking ring (600); the locking ring (600) is driven to rotate by the telescopic movement of the first telescopic cylinder (601); locking teeth (602) are provided on the locking ring (600); and a corresponding protrusion (300) is provided at the lower end of the outer mold cylinder (3).

3. The forming device of a graphite crucible for producing negative electrode materials for lithium batteries according to claim 1, characterized in that: A moving mechanism (7) is provided at the bottom of the base (1), and the base (1) can be driven to move by moving the moving mechanism (7).

4. The forming device of a graphite crucible for producing negative electrode materials for lithium batteries according to claim 1, characterized in that: The connection cover (10) and the frame (9) are connected via a lifting mechanism, and the lifting mechanism can drive the connection cover (10) to rise and fall; an opening (1000) is provided on the connection cover (10).

5. The forming device of a graphite crucible for producing negative electrode materials for lithium batteries according to claim 1, characterized in that: The outer mold cylinder (3) is in the shape of a cylinder or a square cylinder; the core column (5) is in the shape of a cone, and the top of the core column (5) is in the shape of a hemisphere; at least two core columns (5) are provided.

6. A method for processing a graphite crucible using the molding device according to claim 1, characterized in that: The following steps are involved: S1, moving the top forming template (2) along the core column (5) on the base (1) and placing it on the base (1); S2, connecting the outer mold cylinder (3) to the base (1) or the top molding template (2), and sealing the opening (1000) at the lower end of the outer mold cylinder (3) through the top molding template (2); S3, adding paste into the outer mold cylinder (3); S4, after adding the paste, the bottom forming template (4) is driven by a hydraulic cylinder (12) or a press to move and perform pressing and forming, and a crucible body (13) is obtained after the pressing and forming; S5, removing the bottom forming template (4) and the outer mold cylinder (3); lifting the top forming template (2) and the crucible body (13) by means of a lifting device to achieve demoulding.

7. A method for processing a graphite crucible according to claim 6, characterized in that: In S1: the top molding template (2) and the core column (5) are both coated with a release agent.

Images