Carbonization device for producing negative electrode of lithium ion battery

Abstract

The utility model relates to the technical field of lithium battery carbonization, in particular to a carbonization device for producing a negative electrode of a lithium ion battery, which comprises a carbonization furnace and a crucible, and the crucible is arranged in the carbonization furnace; a left graphite heating chamber is arranged at the left end in the carbonization furnace, a right graphite heating chamber is arranged at the right end in the carbonization furnace, a heat insulation plate fixed in the carbonization furnace is arranged between the left graphite heating chamber and the right graphite heating chamber, a through opening penetrating left and right is formed in the heat insulation plate, and the right end of the through opening is covered with a right heat preservation cover plate. A mesh supporting plate penetrating through the through opening is fixed to the left end of the right heat preservation cover plate. According to the utility model, the preheating heat of the left graphite heating chamber can be accurately controlled, so that the effect of preheating the lithium battery cathode material by the left graphite heating chamber can be ensured, the uniformity of preheating and high-temperature heating of the lithium battery cathode material can be improved, and the carbonization efficiency of the lithium battery cathode material can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery carbonization, in particular to a carbonization device for producing the negative electrode of a lithium-ion battery. Background Art

[0002] Carbonization is an essential process in the production of lithium battery negative electrode materials. The negative electrode materials are generally powders, and their carbonization process is divided into several stages, namely: preheating, high-temperature carbonization, and cooling. During the high-temperature carbonization process, it is often necessary to completely cover the wrapping material on the surface of graphite. As the most ideal and practical lithium battery negative electrode material at present, artificial graphite occupies the vast majority of the lithium battery negative electrode material market due to its advantages such as good stability, good conductivity, and good cycle performance.

[0003] For example, the Chinese patent authorization announcement number CN221376320U discloses a carbonization device for producing lithium battery negative electrode materials, which includes a furnace body shell, a first hollow graphite heating element, a second hollow graphite heating element, an insulating gasket, a plugging block, a water-cooled electrode, a rectifier transformer electrically connected, a heat-insulating and heat-preserving material, an electric push rod, and a crucible. Compared with the prior art; this utility model uses two-stage hollow graphite heating elements to heat to realize the preheating and carbonization treatment of lithium battery negative electrode materials. After the lithium battery negative electrode materials are preheated, the heating rate during the carbonization process can be accelerated, the carbonization efficiency can be improved, and this utility model has a simple structure and is convenient to use;

[0004] By referring to the above comparative documents, it can be seen that the prior art still has the following deficiencies. When preheating the lithium battery negative electrode materials in the crucible, since the heat during preheating inside the furnace body shell is different from the heat during normal heating, but the heat during preheating inside the furnace body shell will be mixed with the heat during normal heating, which will cause inaccurate control of the heat during preheating and affect the normal preheating effect. Moreover, the lithium battery negative electrode materials in the crucible are heated from the outside to the inside, and the lithium battery negative electrode materials located deeper inside cannot be heated immediately, which will cause uneven heating of the outer surface and the inside of the lithium battery negative electrode materials. Therefore, the heating efficiency still needs to be improved. Summary of the Utility Model

[0005] The utility model provides a carbonization device for producing the negative electrode of a lithium-ion battery, which is beneficial to ensuring the preheating effect and improving the uniformity of heating of the lithium battery negative electrode materials during heating.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A carbonization device for producing the negative electrode of a lithium-ion battery includes a carbonization furnace and a crucible, and the crucible is arranged inside the carbonization furnace;

[0008] The left end inside the carbonization furnace is provided with a left graphite heating chamber, and the right end inside the carbonization furnace is provided with a right graphite heating chamber. An insulating plate fixed inside the carbonization furnace is arranged between the left graphite heating chamber and the right graphite heating chamber. A through hole penetrating left and right is opened in the insulating plate. The right end of the through hole is covered with a right heat preservation cover plate. A mesh support plate passing through the through hole is fixed at the left end of the right heat preservation cover plate. A left heat preservation cover plate is fixed at the left end of the mesh support plate. The crucible is placed on the mesh support plate. A sliding drive assembly is arranged below the mesh support plate;

[0009] In the middle of the upper end of the carbonization furnace, an electric cylinder is fixed. The power end of the electric cylinder is connected with a heat preservation lifting plate. Driving motors are fixed on both the left and right sides of the upper end of the heat preservation lifting plate. Stirring shafts are arranged in both the left graphite heating chamber and the right graphite heating chamber. A plurality of stirring blades are fixed at the lower ends on both sides of the stirring shafts. Activity openings are opened on both sides of the upper end of the carbonization furnace. The stirring shafts all extend upward out of the carbonization furnace through the adjacent activity openings, and the stirring shafts all rotate upward through the upper surface of the heat preservation lifting plate. The power ends of the driving motors are all connected with the upper ends of the adjacent stirring shafts.

[0010] Further, furnace doors are covered on both sides of the front end of the carbonization furnace.

[0011] Further, the left heat preservation cover plate and the right heat preservation cover plate are symmetrically distributed left and right.

[0012] Further, temperature controllers are installed on both the left and right sides of the carbonization furnace.

[0013] Further, the sliding drive assembly includes a forward and reverse motor, a lead screw, and two guide rails. The forward and reverse motor is fixed at the lower right end of the carbonization furnace. One end of the lead screw is connected to the power end of the forward and reverse motor, and the other end of the lead screw rotates through the carbonization furnace, and the lead screw rotates through the insulating plate.

[0014] Further, the two guide rails are respectively fixed at the inner bottom ends of the left graphite heating chamber and the right graphite heating chamber. The left heat preservation cover plate and the right heat preservation cover plate are both slidably connected to the adjacent guide rails, and the left heat preservation cover plate and the right heat preservation cover plate are both threadedly sleeved on the lead screw.

[0015] Further, heat insulation telescopic covers connected to the upper end of the carbonization furnace are arranged above the activity openings, and the upper ends of the heat insulation telescopic covers are connected to the lower end of the heat preservation lifting plate.

[0016] The beneficial effects of the present utility model:

[0017] 1. When the left graphite heating chamber preheats the lithium battery negative electrode material in the crucible, the right heat preservation cover plate covers the through hole, thereby preventing the high temperature in the right graphite heating chamber from entering the relatively lower temperature left graphite heating chamber, which is beneficial to accurately controlling the preheating heat of the left graphite heating chamber, so it is beneficial to ensure the effect when the left graphite heating chamber preheats the lithium battery negative electrode material;

[0018] 2. The rotation of the stirring blades can stir the negative electrode material of the lithium battery in the crucible, which is beneficial to improving the uniformity of the negative electrode material of the lithium battery during preheating and high-temperature heating, and is beneficial to effectively improving the carbonization efficiency of the negative electrode material of the lithium battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the crucible moving working structure of the present invention;

[0021] Figure 3 It is a schematic diagram of the overall external structure of the present invention.

[0022] Description of the reference numerals:

[0023] Carbonization furnace 1, left graphite heating chamber 2, right graphite heating chamber 3, heat insulation plate 4, crucible 5, mesh support plate 6, left heat insulation cover plate 7, right heat insulation cover plate 8, through hole 9, forward and reverse motor 10, lead screw 11, heat insulation lifting plate 12, drive motor 13, heat insulation expansion cover 14, stirring shaft 15, stirring blade 16, electric cylinder 17, guide rail 18, temperature controller 19, furnace door 20, movable opening 21. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] For the convenience of understanding by those skilled in the art, the present invention will be further described below in conjunction with the embodiments and the drawings. The content mentioned in the embodiments does not limit the present invention.

[0025] As Figure 1 、 3 shown, in this embodiment, it includes a carbonization furnace 1 and a crucible 5. The crucible 5 is arranged in the carbonization furnace 1. A left graphite heating chamber 2 is arranged at the left end in the carbonization furnace 1, and a right graphite heating chamber 3 is arranged at the right end in the carbonization furnace 1. A heat insulation plate 4 fixed in the carbonization furnace 1 is arranged between the left graphite heating chamber 2 and the right graphite heating chamber 3. A through hole 9 penetrating left and right is opened in the heat insulation plate 4. The right end of the through hole 9 is covered with a right heat insulation cover plate 8. A mesh support plate 6 passing through the through hole 9 is fixed to the left end of the right heat insulation cover plate 8. A left heat insulation cover plate 7 is fixed to the left end of the mesh support plate 6. The crucible 5 is placed on the mesh support plate 6. Furnace doors 20 are covered on both sides of the front end of the carbonization furnace 1. The left heat insulation cover plate 7 and the right heat insulation cover plate 8 are symmetrically distributed left and right. Temperature controllers 19 are installed on both sides of the carbonization furnace 1.

[0026] When the crucible 5 contains the negative electrode material of the lithium battery, when preheating the negative electrode material of the lithium battery in the crucible 5 through the left graphite heating chamber 2, the right heat preservation cover plate 8 covers the through hole 9, so as to prevent the high temperature in the right graphite heating chamber 3 from entering the left graphite heating chamber 2 with relatively low temperature. Moreover, the temperature in the left graphite heating chamber 2 is controlled to reach 600 °C by the temperature controller 19 on the left side of the carbonization furnace 1. The high temperature of 600 °C preheats the negative electrode material of the lithium battery, which is beneficial to accurately control the preheating heat of the left graphite heating chamber 2, so it is beneficial to ensure the effect when the left graphite heating chamber 2 preheats the negative electrode material of the lithium battery.

[0027] As Figure 1 , 2 shown, in this embodiment, a sliding drive assembly is provided below the mesh support plate 6. The sliding drive assembly includes a positive and negative motor 10, a lead screw 11 and two guide rails 18. The positive and negative motor 10 is fixed to the lower right end of the carbonization furnace 1. One end of the lead screw 11 is connected to the power end of the positive and negative motor 10, and the other end of the lead screw 11 rotates through the carbonization furnace 1. The lead screw 11 rotates through the heat insulation plate 4. The two guide rails 18 are respectively fixed to the inner bottom ends of the left graphite heating chamber 2 and the right graphite heating chamber 3. The left heat preservation cover plate 7 and the right heat preservation cover plate 8 are both slidably connected to the adjacent guide rails 18, and the left heat preservation cover plate 7 and the right heat preservation cover plate 8 are both threadedly sleeved on the lead screw 11.

[0028] After the preheating is completed and the negative electrode material of the lithium battery in the crucible 5 is subjected to high-temperature carbonization, the positive and negative motor 10 is operated to drive the lead screw 11 to rotate. The lead screw 11 will drive the left heat preservation cover plate 7 and the right heat preservation cover plate 8 to move to the right along the guide rails 18. At the same time, the mesh support plate 6 and the crucible 5 will move together, and the crucible 5 will pass through the through hole 9 and enter the right graphite heating chamber 3 until the left heat preservation cover plate 7 covers the through hole 9. At this time, it can prevent the high temperature in the right graphite heating chamber 3 from flowing out to the left graphite heating chamber 2 through the through hole 9. Then, the temperature in the right graphite heating chamber 3 is controlled to reach 1000 °C by the temperature controller 19 on the right side of the carbonization furnace 1. At this time, the negative electrode material of the lithium battery in the crucible 5 can be subjected to high-temperature carbonization treatment.

[0029] As Figure 1 , 2As shown, in this embodiment, an electric cylinder 17 is fixed in the middle of the upper end of the carbonization furnace 1. The power end of the electric cylinder 17 is connected to a heat-insulating lifting plate 12. Driving motors 13 are fixed on both the left and right sides of the upper end of the heat-insulating lifting plate 12. Stirring shafts 15 are arranged in both the left graphite heating chamber 2 and the right graphite heating chamber 3. A number of stirring blades 16 are fixed at the lower ends on both sides of the stirring shaft 15. Activity openings 21 are formed on both sides of the upper end of the carbonization furnace 1. The stirring shafts 15 extend upward through the adjacent activity openings 21 out of the carbonization furnace 1, and the stirring shafts 15 rotate upward through the upper surface of the heat-insulating lifting plate 12. The power ends of the driving motors 13 are connected to the upper ends of the adjacent stirring shafts 15.

[0030] When the crucible 5 needs to move left and right, the heat-insulating lifting plate 12, the driving motor 13, the stirring shaft 15 and the stirring blades 16 can be driven to move up and down by the expansion and contraction of the electric cylinder 17. When the stirring blades 16 move upward, they can move out of the crucible 5. At this time, it is beneficial for the crucible 5 to move left and right normally. When the stirring blades 16 move downward and insert into the crucible 5, it is beneficial to stir the lithium battery anode material in the crucible 5 through the stirring blades 16. Therefore, on the premise that the stirring blades 16 are located in the crucible 5, the driving motor 13 works to drive the stirring shaft 15 and the stirring blades 16 to rotate, and then the lithium battery anode material in the crucible 5 can be stirred through the rotation of the stirring blades 16, which is beneficial to improving the uniformity of the lithium battery anode material during preheating and high-temperature heating, and is beneficial to effectively improving the carbonization efficiency of the lithium battery anode material.

[0031] As Figure 1 、 2 As shown, in this embodiment, heat-insulating telescopic covers 14 connected to the upper end of the carbonization furnace 1 are arranged above the activity openings 21. The upper ends of the heat-insulating telescopic covers 14 are connected to the lower end of the heat-insulating lifting plate 12.

[0032] When the heat-insulating lifting plate 12 moves up and down, the heat-insulating telescopic cover 14 will be stretched or compressed. The heat-insulating telescopic cover 14 gathers the high-temperature heat coming out of the through-opening 9, thereby preventing the high temperature from being lost.

[0033] All the technical features in this embodiment can be freely combined according to actual needs.

[0034] The above embodiment is a preferred implementation scheme of the present invention. In addition, there are other implementation methods. Any obvious replacement without departing from the concept of the technical solution is within the protection scope of the present invention.

Claims

1. A carbonization device for producing negative electrodes of lithium-ion batteries, comprising a carbonization furnace (1) and a crucible (5), wherein the crucible (5) is arranged in the carbonization furnace (1), characterized in that: A left graphite heating chamber (2) is provided at the left end of the carbonization furnace (1), and a right graphite heating chamber (3) is provided at the right end of the carbonization furnace (1); a heat insulation plate (4) fixed in the carbonization furnace (1) is provided between the left graphite heating chamber (2) and the right graphite heating chamber (3); a through opening (9) is provided in the heat insulation plate (4) and passes through the through opening (9); a right heat insulation cover plate (8) is covered at the right end of the through opening (9); a mesh support plate (6) passing through the through opening (9) is fixed at the left end of the right heat insulation cover plate (8); a left heat insulation cover plate (7) is fixed at the left end of the mesh support plate (6); the crucible (5) is placed on the mesh support plate (6); and a sliding drive assembly is provided below the mesh support plate (6); An electric cylinder (17) is fixed in the middle of the upper end of the carbonization furnace (1), and the power end of the electric cylinder (17) is connected to a heat-insulating lifting plate (12). A driving motor (13) is fixed to the left and right sides of the upper end of the heat-insulating lifting plate (12). A stirring shaft (15) is provided in the left graphite heating chamber (2) and the right graphite heating chamber (3). A plurality of stirring blades (16) are fixed to the lower ends of both sides of the stirring shaft (15). Both sides of the upper end of the carbonization furnace (1) are provided with movable openings (21). The stirring shafts (15) extend upwards out of the carbonization furnace (1) through adjacent movable openings (21), and the stirring shafts (15) rotate upwards and pass through the upper end of the heat-insulating lifting plate (12). The power ends of the driving motors (13) are connected to the upper ends of adjacent stirring shafts (15).

2. A carbonization device for producing negative electrodes for lithium-ion batteries as claimed in claim 1, characterized in that: Both sides of the front end of the carbonization furnace (1) are covered with furnace doors (20).

3. A carbonization device for producing negative electrodes for lithium-ion batteries as claimed in claim 1, characterized in that: The left heat-insulating cover plate (7) and the right heat-insulating cover plate (8) are symmetrically distributed on the left and right.

4. A carbonization device for producing negative electrodes for lithium-ion batteries as claimed in claim 1, characterized in that: Temperature controllers (19) are installed on both the left and right sides of the carbonization furnace (1).

5. A carbonization device for producing negative electrodes for lithium-ion batteries as claimed in claim 1, characterized in that: The sliding drive assembly comprises a forward and reverse motor (10), a screw rod (11) and two guide rails (18); the forward and reverse motor (10) is fixed to the lower right end of the carbonization furnace (1); one end of the screw rod (11) is connected to the power end of the forward and reverse motor (10), and the other end of the screw rod (11) rotates to penetrate into the carbonization furnace (1); the screw rod (11) rotates to penetrate the heat insulation plate (4).

6. A carbonization device for producing negative electrodes for lithium-ion batteries as claimed in claim 5, characterized in that: The two guide rails (18) are fixed one by one to the inner bottom ends of the left graphite heating chamber (2) and the right graphite heating chamber (3); the left insulation cover plate (7) and the right insulation cover plate (8) are both slidably connected to the adjacent guide rails (18); and the left insulation cover plate (7) and the right insulation cover plate (8) are both threadedly sleeved with the screw rod (11).

7. A carbonization device for producing negative electrodes for lithium-ion batteries as claimed in claim 1, characterized in that: A heat-insulating telescopic cover (14) connected to the upper end of the carbonization furnace (1) is provided above the movable opening (21), and the upper end of the heat-insulating telescopic cover (14) is connected to the lower end of the heat-insulating lifting plate (12).

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