A lithium battery negative electrode graphite and carbon fiber integrated graphitization device and method

Abstract

The application discloses a kind of lithium battery negative electrode graphite and carbon fiber integration graphitization device and method, device includes furnace body and blow mechanism, the furnace body includes brick wall layer, heat preservation layer, heating layer and barrier block, the heat preservation layer is embedded in the brick wall layer, the heating layer is embedded in the heat preservation layer, the heating layer has a closed heating cavity;The blow mechanism is used to pass into inert gas to the air duct.This application has the beneficial effect that: the integrated graphitization of lithium battery negative electrode graphite and carbon fiber can reduce equipment cost and energy consumption, and by blowing mechanism to pass into inert gas to the air duct, inert gas is discharged from the air outlet and blown to the surface of carbon fiber felt, to remove ash impurities generated during the heating process of carbon fiber felt, which can effectively discharge the ash impurities on the surface of carbon fiber felt, and avoid the influence of ash impurities saturation on graphitization effect.

Description

Technical Field

[0001] This invention relates to the field of graphitization technology, specifically to an integrated graphitization device and method for lithium battery negative electrode graphite and carbon fiber. Background Technology

[0002] Graphitization of lithium-ion battery anodes refers to the process of heating lithium-ion battery anode materials to above 2000℃ in a graphitization furnace to transform them into a graphite structure. Graphitization of carbon fibers refers to the process of reacting carbon fiber materials with an inert gas at high temperatures, forming a thin graphite film on the surface. This process is typically achieved through ultra-high temperature heating or high-energy material radiation, transforming the internal structure of the carbon fibers from a disordered layered graphite sheet structure into a regular three-dimensional graphite crystal structure.

[0003] Typically, the graphitization of lithium battery anodes and carbon fiber is completed in different graphitization furnaces, which not only increases equipment costs but also increases energy consumption in the graphitization process. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose an integrated graphitization device and method for lithium battery anode graphite and carbon fiber, which solves the technical problem that in the prior art, the graphitization of lithium battery anode and carbon fiber are completed in different graphitization furnaces, which not only increases equipment costs but also increases energy consumption in the graphitization process.

[0005] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0006] This invention provides an integrated graphitization device for lithium battery negative electrode graphite and carbon fiber, comprising:

[0007] The furnace body includes a brick wall layer, an insulation layer, a heating layer, and a barrier block. The insulation layer is embedded within the brick wall layer, and the heating layer is embedded within the insulation layer. The heating layer has a sealed heating cavity. The barrier block is built into the heating cavity and divides the heating cavity into a first heating cavity and a second heating cavity. The first heating cavity is used for graphitizing the graphite of the lithium battery negative electrode, and the second heating cavity is used for graphitizing carbon fiber felt. An air duct is formed within the barrier block, and the side wall of the barrier block near the second heating cavity is densely covered with air outlet holes communicating with the air duct.

[0008] A blower mechanism for introducing inert gas into the air duct.

[0009] In some embodiments, the heating layer is a resistive material layer.

[0010] In some embodiments, the heating layer includes an upper heating layer and a lower heating layer, the upper heating layer is located above the heating cavity, the lower heating layer is located below the heating cavity, and a first air inlet is provided on the upper heating layer, the lower end of the first air inlet being connected to the air duct;

[0011] The insulation layer includes an upper insulation layer, a lower insulation layer, and a side insulation layer. The upper insulation layer is located above the upper heating layer. A second air inlet is provided on the upper insulation layer. The lower end of the second air inlet is connected to the upper end of the first air inlet, and the upper end of the second air inlet is connected to the air outlet of the blowing mechanism.

[0012] In some embodiments, a receiving groove located below the second heating chamber is provided on the upper surface of the lower heating layer.

[0013] In some embodiments, the blowing mechanism includes a fixed base, an air pump, and an air inlet pipe. The fixed base is fixed above the upper insulation layer, the air pump is fixed to the fixed base, the inlet of the air pump is used to communicate with an inert gas source, the outlet of the air pump is connected to one end of the air inlet pipe, the other end of the air inlet pipe is connected to the upper end of the second air inlet hole, and an air inlet valve is provided on the air inlet pipe.

[0014] In some embodiments, the blowing mechanism further includes a vacuum pump and an extraction pipe. The vacuum pump is fixed to the mounting base, the inlet of the vacuum pump is connected to one end of the extraction pipe, the other end of the extraction pipe is connected to the upper end of the second air inlet, and an extraction valve is provided on the extraction pipe.

[0015] In some embodiments, a first vent hole communicating with the second heating chamber is formed in the side insulation layer, and a second vent hole communicating with the first vent hole is formed in the brick wall layer, with a vent valve provided at the outlet end of the second vent hole.

[0016] In some embodiments, the upper heating layer has a first perforation, and the upper insulation layer has a second perforation;

[0017] The integrated graphitization device for lithium battery negative electrode graphite and carbon fiber also includes a shaking mechanism. The shaking mechanism includes a material frame, a lifting rod, and a lifting drive component. The material frame is located inside the second heating chamber and is used to fix it to the outer edge of the carbon fiber felt. The lower end of the lifting rod is fixedly connected to the material frame, and the upper end of the lifting rod passes through the first through hole and the second through hole and is connected to the lifting drive component.

[0018] In some embodiments, the lifting drive component includes a base plate, a guide rod, a lifting plate, and a lifting drive cylinder. The base plate is fixed above the upper insulation layer, the guide rod is fixed to the base plate, the lifting plate has a guide hole that cooperates with the guide rod, the lifting plate can move up and down along the guide rod, the lifting plate is fixedly connected to the upper end of the lifting rod, the cylinder body of the lifting drive cylinder is fixed to the base plate, and the output shaft of the lifting drive cylinder is connected to the lifting plate and is used to drive the lifting plate to move up and down.

[0019] This invention also provides a method for the integrated graphitization of graphite and carbon fiber in lithium battery anodes, applicable to the aforementioned integrated graphitization apparatus for lithium battery anodes, and comprising the following steps:

[0020] S1. Load the graphite negative electrode of the lithium battery into the crucible, then load the crucible into the first heating chamber, and put the carbon fiber felt into the second heating chamber.

[0021] S2. Power is applied to the heating layer to heat the graphite and carbon fiber felt of the lithium battery negative electrode.

[0022] S3. During heating, inert gas is introduced into the air duct through the blowing mechanism. The inert gas is discharged from the air outlet and blown onto the surface of the carbon fiber felt to remove ash impurities generated during the heating process of the carbon fiber felt.

[0023] S4. Complete the graphitization of lithium battery negative electrode graphite and carbon fiber felt.

[0024] Compared with the prior art, the beneficial effects of the integrated graphitization device and method for lithium battery negative electrode graphite and carbon fiber provided by the present invention are as follows: the heating chamber is divided into a first heating chamber and a second heating chamber by a barrier block, the lithium battery negative electrode graphite is loaded into a crucible, the crucible is then loaded into the first heating chamber, and the carbon fiber felt is placed into the second heating chamber, thereby enabling integrated graphitization of lithium battery negative electrode graphite and carbon fiber, reducing equipment cost and energy consumption. At the same time, inert gas is introduced into the air duct through a blower mechanism, and the inert gas is discharged from the air outlet and blown onto the surface of the carbon fiber felt to remove ash impurities generated during the heating process of the carbon fiber felt. This can effectively remove ash impurities from the surface of the carbon fiber felt and avoid ash impurity saturation affecting the graphitization effect. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of an integrated graphitization device for lithium battery negative electrode graphite and carbon fiber provided in an embodiment of the present invention.

[0026] Figure 2 yes Figure 1 A schematic diagram of the furnace body;

[0027] Figure 3 yes Figure 1 A magnified view of a portion of region A in the middle;

[0028] Figure 4 yes Figure 1 A magnified view of a portion of region B in the middle;

[0029] Explanation of reference numerals in the attached drawings: 1-furnace body, 11-brick wall layer, 111-second vent, 12-insulation layer, 121-upper insulation layer, 1211-second air inlet, 1212-second perforation, 122-lower insulation layer, 123-side insulation layer, 1231-first vent, 13-heating layer, 131-first heating chamber, 132-second heating chamber, 1321-feeding trough, 133-upper heating layer, 1331-first air inlet, 1332-first perforation, 134 - Lower heating layer, 14- Barrier block, 141- Air duct, 142- Air outlet, 2- Blowing mechanism, 21- Fixed seat, 22- Air pump, 23- Air inlet pipe, 24- Air inlet valve, 25- Vacuum pump, 26- Extraction pipe, 27- Extraction valve, 28- Vent valve, 3- Carbon fiber felt, 4- Crucible, 5- Shaking mechanism, 51- Material frame, 52- Lifting rod, 53- Lifting drive component, 531- Base plate, 532- Guide rod, 533- Lifting plate, 534- Lifting drive cylinder. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0031] To address the technical problem that graphitization of lithium battery anodes and carbon fibers are completed in separate graphitization furnaces, which increases both equipment costs and energy consumption during the graphitization process, this invention provides an integrated graphitization device and method for lithium battery anode graphite and carbon fibers. This method enables integrated graphitization of lithium battery anode graphite and carbon fibers, thereby reducing equipment costs and energy consumption.

[0032] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of an integrated graphitization device and method for lithium battery negative electrode graphite and carbon fiber according to an embodiment of the present invention. The integrated graphitization device for lithium battery negative electrode graphite and carbon fiber includes a furnace body 1 and a blower mechanism 2.

[0033] Please see Figures 1-3The furnace body 1 includes a brick wall layer 11, a heat insulation layer 12, a heating layer 13, and a barrier block 14. The heat insulation layer 12 is embedded in the brick wall layer 11, and the heating layer 13 is embedded in the heat insulation layer 12. The heating layer 13 has a sealed heating cavity. The barrier block 14 is built into the heating cavity and divides the heating cavity into a first heating cavity 131 and a second heating cavity 132. The first heating cavity 131 is used for graphitizing the graphite of the lithium battery negative electrode, and the second heating cavity 132 is used for graphitizing the carbon fiber felt 3. An air duct 141 is formed in the barrier block 14. The side wall of the barrier block 14 near the second heating cavity 132 is densely covered with air outlet holes 142 that communicate with the air duct 141.

[0034] The blowing mechanism 2 is used to introduce inert gas into the air duct 141.

[0035] In use, the lithium battery negative electrode graphite is loaded into the crucible 4, and then the crucible 4 is placed into the first heating chamber 131. The carbon fiber felt 3 is placed into the second heating chamber 132. The heating layer 13 is energized to heat the lithium battery negative electrode graphite and the carbon fiber felt 3. During heating, inert gas is introduced into the air duct 141 through the blower mechanism 2. The inert gas is discharged from the air outlet 142 and blown onto the surface of the carbon fiber felt 3 to remove the ash impurities generated during the heating process of the carbon fiber felt 3 until the graphitization of the lithium battery negative electrode graphite and the carbon fiber felt 3 is completed.

[0036] This invention divides the heating chamber into a first heating chamber 131 and a second heating chamber 132 using a barrier block 14. The lithium battery negative electrode graphite is loaded into a crucible 4, which is then placed into the first heating chamber 131. The carbon fiber felt 3 is placed into the second heating chamber 132, thereby enabling integrated graphitization of the lithium battery negative electrode graphite and carbon fiber, reducing equipment costs and energy consumption. Simultaneously, an inert gas is introduced into the air duct 141 through a blower mechanism 2. The inert gas exits from the air outlet 142 and is blown onto the surface of the carbon fiber felt 3 to remove ash impurities generated during the heating process. This effectively removes ash impurities from the surface of the carbon fiber felt 3, preventing ash impurity saturation from affecting the graphitization effect.

[0037] In one embodiment, please refer to Figure 1 The heating layer 13 is a resistive material layer, and heating is achieved by energizing the resistive material layer.

[0038] In one embodiment, please refer to Figures 1-4The heating layer 13 includes an upper heating layer 133 and a lower heating layer 134. The upper heating layer 133 is located above the heating cavity, and the lower heating layer 134 is located below the heating cavity. The upper heating layer 133 has a first air inlet 1331, and the lower end of the first air inlet 1331 is connected to the air duct 141. The insulation layer 12 includes an upper insulation layer 121, a lower insulation layer 122, and a side insulation layer 123. The upper insulation layer 121 is located above the upper heating layer 133. The upper insulation layer 121 has a second air inlet 1211, the lower end of the second air inlet 1211 is connected to the upper end of the first air inlet 1331, and the upper end of the second air inlet 1211 is connected to the air outlet of the blowing mechanism 2.

[0039] In one embodiment, please refer to Figure 1 and Figure 2 The upper surface of the lower heating layer 134 is provided with a receiving groove 1321 located below the second heating chamber 132. Ash blown off from the carbon fiber felt 3 in the second heating chamber 132 will fall into the receiving groove 1321 under the action of gravity. The receiving groove 1321 needs to be cleaned regularly.

[0040] In one embodiment, please refer to Figures 1-4 The blowing mechanism 2 includes a fixed base 21, an air pump 22, and an air inlet pipe 23. The fixed base 21 is fixed above the upper insulation layer 121. The air pump 22 is fixed to the fixed base 21. The inlet of the air pump 22 is used to communicate with an inert gas source. The outlet of the air pump 22 is connected to one end of the air inlet pipe 23. The other end of the air inlet pipe 23 is connected to the upper end of the second air inlet hole 1211. An air inlet valve 24 is provided on the air inlet pipe 23.

[0041] In one embodiment, please refer to Figures 1-4 The blowing mechanism 2 also includes a vacuum pump 25 and an air extraction pipe 26. The vacuum pump 25 is fixed to the fixed base 21. The inlet of the vacuum pump 25 is connected to one end of the air extraction pipe 26, and the other end of the air extraction pipe 26 is connected to the upper end of the second air inlet 1211. An air extraction valve 27 is provided on the air extraction pipe 26.

[0042] In one embodiment, please refer to Figures 1-4 The side insulation layer 123 has a first vent 1231 that communicates with the second heating chamber 132, and the brick wall layer 11 has a second vent 111 that communicates with the first vent 1231. A vent valve 28 is provided at the outlet end of the second vent 111.

[0043] In this embodiment, during use, a vacuum is first evacuated. Specifically, the ventilation valve 28 and the inlet valve 24 are closed, the extraction valve 27 is opened, and the vacuum pump 25 is turned on. The air in the second heating chamber 132 is discharged through the first inlet port 1331, the second inlet port 1211, and the extraction pipe 26, thereby evacuating the second heating chamber 132. Then, the extraction valve 27 and the vacuum pump 25 are closed, and the inlet valve 24 and the air pump 22 are turned on. The inert gas enters the air duct 141 through the air pump 22, the inlet pipe 23, the second inlet port 1211, and the first inlet port 1331. The inert gas is discharged from the air outlet 142 and blown onto the surface of the carbon fiber felt 3 to remove the ash impurities generated during the heating process of the carbon fiber felt 3. Finally, the inert gas is discharged through the first ventilation port 1231, the second ventilation port 111, and the ventilation valve 28.

[0044] In one embodiment, please refer to Figures 1-4 The upper heating layer 133 has a first perforation 1332, and the upper insulation layer 121 has a second perforation 1212. The integrated graphitization device for lithium battery negative electrode graphite and carbon fiber also includes a shaking mechanism 5. The shaking mechanism 5 includes a material frame 51, a lifting rod 52, and a lifting drive component 53. The material frame 51 is located inside the second heating chamber 132 and is used to fix it to the outer edge of the carbon fiber felt 3. The lower end of the lifting rod 52 is fixedly connected to the material frame 51, and the upper end of the lifting rod 52 passes through... The first perforation 1332 and the second perforation 1212 are connected to the lifting drive 53. In use, the lifting drive 53 drives the material frame 51 to move up and down reciprocally via the lifting rod 52, thereby shaking the carbon fiber felt 3 up and down. This can shake off ash impurities and also make each part of the carbon fiber felt 3 face the air outlet 142 in sequence, so that each part of the carbon fiber felt 3 can face the air outlet 142 and be blown by inert gas, thus improving the ash impurity removal effect.

[0045] In one embodiment, please refer to Figures 1-4 The lifting drive component 53 includes a base plate 531, a guide rod 532, a lifting plate 533, and a lifting drive cylinder 534. The base plate 531 is fixed above the upper insulation layer 121. The guide rod 532 is fixed to the base plate 531. The lifting plate 533 has a guide hole that cooperates with the guide rod 532. The lifting plate 533 can move up and down along the guide rod 532. The lifting plate 533 is fixedly connected to the upper end of the lifting rod 52. The cylinder body of the lifting drive cylinder 534 is fixed to the base plate 531. The output shaft of the lifting drive cylinder 534 is connected to the lifting plate 533 and is used to drive the lifting plate 533 to move up and down, thereby driving the lifting rod 52 to move up and down, and then driving the material frame 51 to move up and down.

[0046] This invention also provides a method for the integrated graphitization of graphite and carbon fiber in lithium battery anodes, applicable to the aforementioned integrated graphitization apparatus for lithium battery anodes, and comprising the following steps:

[0047] S1. Load the graphite negative electrode of the lithium battery into the crucible 4, then load the crucible 4 into the first heating chamber 131, and put the carbon fiber felt 3 into the second heating chamber 132.

[0048] S2. Power is applied to the heating layer 13 to heat the graphite and carbon fiber felt 3 of the lithium battery negative electrode.

[0049] S3. During heating, inert gas is introduced into the air duct 141 through the blowing mechanism 2. The inert gas is discharged from the air outlet 142 and blown onto the surface of the carbon fiber felt 3 to remove ash impurities generated during the heating process of the carbon fiber felt 3.

[0050] S4. Complete the graphitization of lithium battery negative electrode graphite and carbon fiber felt 3.

[0051] This invention divides the heating chamber into a first heating chamber 131 and a second heating chamber 132 using a barrier block 14. The lithium battery negative electrode graphite is loaded into a crucible 4, which is then placed into the first heating chamber 131. The carbon fiber felt 3 is placed into the second heating chamber 132, thereby enabling integrated graphitization of the lithium battery negative electrode graphite and carbon fiber, reducing equipment costs and energy consumption. Simultaneously, an inert gas is introduced into the air duct 141 through a blower mechanism 2. The inert gas exits from the air outlet 142 and is blown onto the surface of the carbon fiber felt 3 to remove ash impurities generated during the heating process. This effectively removes ash impurities from the surface of the carbon fiber felt 3, preventing ash impurity saturation from affecting the graphitization effect.

[0052] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An integrated graphitization device for lithium battery negative electrode graphite and carbon fiber, characterized in that, include: The furnace body includes a brick wall layer, an insulation layer, a heating layer, and a barrier block. The insulation layer is embedded within the brick wall layer, and the heating layer is embedded within the insulation layer. The heating layer has a sealed heating cavity. The barrier block is built into the heating cavity and divides the heating cavity into a first heating cavity and a second heating cavity. The first heating cavity is used for graphitizing the graphite of the lithium battery negative electrode, and the second heating cavity is used for graphitizing carbon fiber felt. An air duct is formed within the barrier block, and the side wall of the barrier block near the second heating cavity is densely covered with air outlet holes communicating with the air duct. A blower mechanism for introducing inert gas into the air duct; The heating layer includes an upper heating layer and a lower heating layer. The upper heating layer is located above the heating cavity, and the lower heating layer is located below the heating cavity. A first air inlet is provided on the upper heating layer, and the lower end of the first air inlet is connected to the air duct. The insulation layer includes an upper insulation layer, a lower insulation layer and a side insulation layer. The upper insulation layer is located above the upper heating layer. A second air inlet is provided on the upper insulation layer. The lower end of the second air inlet is connected to the upper end of the first air inlet, and the upper end of the second air inlet is connected to the air outlet of the blowing mechanism. The blowing mechanism includes a fixed base, an air pump, and an air inlet pipe. The fixed base is fixed above the upper insulation layer, the air pump is fixed to the fixed base, the inlet of the air pump is used to communicate with an inert gas source, the outlet of the air pump is connected to one end of the air inlet pipe, the other end of the air inlet pipe is connected to the upper end of the second air inlet hole, and an air inlet valve is provided on the air inlet pipe. The upper heating layer has a first perforation, and the upper insulation layer has a second perforation; The integrated graphitization device for lithium battery negative electrode graphite and carbon fiber also includes a shaking mechanism. The shaking mechanism includes a material frame, a lifting rod, and a lifting drive component. The material frame is located inside the second heating chamber and is used to fix it to the outer edge of the carbon fiber felt. The lower end of the lifting rod is fixedly connected to the material frame, and the upper end of the lifting rod passes through the first through hole and the second through hole and is connected to the lifting drive component.

2. The integrated graphitization device for lithium battery negative electrode graphite and carbon fiber according to claim 1, characterized in that, The heating layer is a resistive material layer.

3. The integrated graphitization device for lithium battery negative electrode graphite and carbon fiber according to claim 1, characterized in that, A receiving groove located below the second heating chamber is provided on the upper surface of the lower heating layer.

4. The integrated graphitization device for lithium battery negative electrode graphite and carbon fiber according to claim 1, characterized in that, The blowing mechanism also includes a vacuum pump and a suction pipe. The vacuum pump is fixed to the fixed base. The inlet of the vacuum pump is connected to one end of the suction pipe, and the other end of the suction pipe is connected to the upper end of the second air inlet. A suction valve is provided on the suction pipe.

5. The integrated graphitization device for lithium battery negative electrode graphite and carbon fiber according to claim 1, characterized in that, A first vent hole communicating with the second heating chamber is formed in the side insulation layer, and a second vent hole communicating with the first vent hole is formed in the brick wall layer. A vent valve is provided at the outlet end of the second vent hole.

6. The integrated graphitization device for lithium battery negative electrode graphite and carbon fiber according to claim 1, characterized in that, The lifting drive component includes a base plate, a guide rod, a lifting plate, and a lifting drive cylinder. The base plate is fixed above the upper insulation layer, the guide rod is fixed to the base plate, and the lifting plate has a guide hole that cooperates with the guide rod. The lifting plate can move up and down along the guide rod. The lifting plate is fixedly connected to the upper end of the lifting rod. The cylinder body of the lifting drive cylinder is fixed to the base plate, and the output shaft of the lifting drive cylinder is connected to the lifting plate and is used to drive the lifting plate to move up and down.

7. A method for integrating graphite and carbon fiber into a lithium battery negative electrode, characterized in that, The integrated graphitization apparatus for lithium battery negative electrode graphite and carbon fiber as described in any one of claims 1-6, and includes the following steps: S1. Load the graphite negative electrode of the lithium battery into the crucible, then load the crucible into the first heating chamber, and put the carbon fiber felt into the second heating chamber. S2. Power is applied to the heating layer to heat the graphite and carbon fiber felt of the lithium battery negative electrode. S3. During heating, inert gas is introduced into the air duct through the blowing mechanism. The inert gas is discharged from the air outlet and blown onto the surface of the carbon fiber felt to remove ash impurities generated during the heating process of the carbon fiber felt. S4. Complete the graphitization of lithium battery negative electrode graphite and carbon fiber felt.

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