A temperature control device for coating graphite negative electrode material

Abstract

The utility model relates to a temperature control device for coating processing of graphite negative electrode materials, comprising a stirring kettle, a kiln and a thermal circulation mechanism. The stirring kettle mixes graphite negative electrode materials and asphalt coating materials, and carbonizes the graphite negative electrode materials and the asphalt. A temperature measuring unit is arranged in the stirring kettle. The kiln is coated on the outside of the stirring kettle to form a closed thermal insulation chamber around the kiln, and electric heating components and a thermometer are arranged in the thermal insulation chamber. The thermal circulation mechanism is arranged in the thermal insulation chamber, and the thermal circulation mechanism adjusts and controls the temperature in the thermal insulation chamber. The thermal circulation mechanism comprises a heat transfer component arranged on the side walls around the thermal insulation chamber and a thermal circulation component located at the bottom of the thermal insulation chamber.

Description

Technical Field

[0001] The utility model relates to the technical field of natural graphite coating, in particular to a temperature control device for coating processing of graphite negative electrode materials. Background Art

[0002] The negative electrode material of lithium battery is a paste adhesive made of negative electrode active substances such as carbon or non-carbon materials, adhesives and additives, which is evenly applied on both sides of copper foil, dried and rolled. The graphite spacing of lithium battery carbon negative electrode material is smaller than the crystal plane interlayer spacing of interlayer compounds. During the charging and discharging process, the graphite interlayer spacing changes, which can easily cause the graphite layer to peel off and pulverize. Lithium and organic solvents will also be co-embedded in the graphite layer and the organic solvent will decompose, affecting the battery cycle performance. Through graphite modification, the surface of graphite is coated with asphalt with a high softening point, which can improve the compatibility of negative electrode materials and electrolytes, prevent solvent co-embedding, decomposition and peeling of graphite structure. When making negative electrode materials in the prior art, graphite and asphalt are generally mixed in a mixing device to complete the coating, and then put into a kiln for long-term carbonization so that the asphalt covers the surface of the graphite particles.

[0003] A Chinese invention with application number CN202010524752.3 discloses a negative electrode material coating process and coating equipment, including: a heated carbon source area, a negative electrode material area and a gas phase coating area arranged in sequence from bottom to top, one mass portion of negative electrode material is weighed and loaded into the negative electrode material area, and one to five mass portions of carbon source are weighed and loaded into the heated carbon source area; the initial temperatures of the heated carbon source area, the negative electrode material area and the gas phase coating area are set; nitrogen is introduced into the heated carbon source area to suspend the negative electrode material in the gas phase coating area, and the pressure valve at the top of the gas phase coating area is opened to recover the tail gas; the heated carbon source area is maintained at a constant temperature for a preset time, then the temperature is raised to a preset temperature, and then the constant temperature is maintained for a predetermined time to coat the suspended negative electrode material; after stopping the temperature increase, nitrogen continues to be introduced until the temperature drops to room temperature, and the introduction of nitrogen is stopped; the coated negative electrode material is discharged from the negative electrode material area. The present invention also provides negative electrode material coating equipment, which solves the problem that the current negative electrode material coated products are prone to agglomeration and improves the coating rate.

[0004] However, the inventors found that the device has the following problems: 1. Lack of local temperature control; 2. Unable to adjust temperature balance. Utility Model Content

[0005] The purpose of the utility model is to address the deficiencies of the prior art and provide a thermal cycle for graphite negative electrode material coating processing, which can better carbonize the graphite negative electrode material and asphalt in a mixing device through temperature detection and temperature control.

[0006] In view of the above technical problems, the technical solution adopted by the utility model is as follows: a temperature control device for coating processing of graphite negative electrode materials, including a stirring kettle, a kiln and a thermal circulation mechanism. The stirring kettle mixes graphite negative electrode materials and asphalt coating materials, and carbonizes the graphite negative electrode materials and asphalt. A temperature measuring unit is arranged in the stirring kettle. The kiln is coated on the outside of the stirring kettle to form a closed insulation chamber around the kiln, and electric heating components and a thermometer are arranged in the insulation chamber. The thermal circulation mechanism is arranged in the insulation chamber. The thermal circulation mechanism adjusts and controls the temperature in the insulation chamber. The thermal circulation mechanism includes a heat transfer component placed on the side walls around the insulation chamber and a thermal circulation component located at the bottom of the insulation chamber.

[0007] Preferably, the stirring kettle is provided with a feed pipe extending upwardly and penetrating the top of the kiln, and the stirring kettle is provided with a discharge pipe extending downwardly and penetrating the bottom of the kiln.

[0008] As a preferred embodiment, the heat transfer component includes a first serpentine tube, a first fixed tube and a guide fan, the first serpentine tube includes a plurality of first movable tubes and corrugated tubes arranged in parallel, the first movable tubes are arranged along the corresponding side walls of the insulation chamber, the first movable tubes are arranged to be movable and adjusted along the side walls of the insulation chamber, and adjacent first movable tubes are connected end to end through the corrugated tube, the first fixed tube is arranged parallel to the first movable tube, and the first fixed tube is staggered with the first movable tube, the first fixed tubes are connected through a connecting tube, and the two ends of the connecting tube are respectively connected to the two ends of the first serpentine tube through a corrugated connecting tube, the guide fans are respectively installed at the two ends of the first serpentine tube, and the guide fans encourage the airflow in the first serpentine tube to flow along a preset path.

[0009] Preferably, the first moving tubes are provided in N groups, N is an even number greater than zero, and the first moving tubes located at odd positions move synchronously and in the same direction, and the first moving tubes located at even positions move synchronously and in the same direction.

[0010] As a preference, the first moving tubes located at odd positions are arranged to move in the opposite direction to the first moving tubes located at even positions.

[0011] As a preference, the first movable tubes are evenly and correspondingly arranged with drivers that are driven to move through a movable frame.

[0012] Preferably, the driver is provided with two groups, and the first moving tubes at odd positions and the first moving tubes at even positions in the heat transfer components of each group are respectively driven to move by the corresponding driver.

[0013] As a preference, the thermal cycle components include a second serpentine tube and a circulation fan, the second serpentine tube includes a second fixed tube, a second movable tube and a corrugated U-shaped tube arranged in parallel, the second fixed tube is located on both sides of the second serpentine tube, the second movable tube is located between the second fixed tubes, the corrugated U-shaped tube connects the second fixed tube and the second movable tube, the circulation fan is arranged at both ends of the second serpentine tube, the circulation fan agitates the airflow in the second serpentine tube to flow along a preset path, and the two ends of the second serpentine tube are connected by a horizontal connecting tube.

[0014] As a preference, exhaust holes are arranged on the side walls of the first serpentine tube and the second serpentine tube.

[0015] As a preference, the second moving tubes in the second serpentine tubes are all driven by the corresponding drivers to move synchronously.

[0016] Beneficial effects of the utility model:

[0017] 1. By installing heat circulation mechanisms on the inner walls and bottom of the four sides of the kiln, the temperature in the insulation chamber is more balanced to avoid excessive temperature at the heating components;

[0018] 2. By providing a movable first movable tube and a second movable tube, the temperature in the insulation chamber can be adjusted more efficiently;

[0019] 3. By setting up a heat circulation mechanism and a heat transfer component, the heat generated by the electric heating element is transferred to various places in the insulation chamber, reducing the use of electric heating elements and saving energy;

[0020] 4. By moving the odd-numbered and even-numbered first moving tubes separately, the temperature adjustment is more active and free, thereby improving the efficiency of heat transfer.

[0021] In summary, the equipment has the advantages of balanced temperature, high efficiency, energy saving, etc., and is particularly suitable for the field of natural graphite coating technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 It is a structural schematic diagram of a temperature control device for coating and processing of graphite negative electrode materials;

[0024] Figure 2A partial view of a temperature control device for coating graphite negative electrode materials;

[0025] Figure 3 It is a structural schematic diagram of a thermal cycle mechanism;

[0026] Figure 4 Main view of the heat transfer component Figure 1 ;

[0027] Figure 5 Main view of the heat transfer component Figure 2 ;

[0028] Figure 6 Front view of the thermal cycler assembly.

[0029] Figures marked: 1. stirring kettle; 11. feeding pipe; 12. discharging pipe; 2. kiln; 21. insulation chamber; 3. thermal circulation mechanism; 4. heat transfer assembly; 41. first serpentine tube; 411. first movable tube; 42. first fixed tube; 43. connecting tube; 44. guide fan; 5. thermal circulation assembly; 51. second serpentine tube; 511. second fixed tube; 512. second movable tube; 52. circulation fan; 53. horizontal connecting tube; 54. exhaust hole; 6. bellows; 61. bellows connecting tube; 7. driver; 8. movable frame; 9. bellows U-shaped tube. DETAILED DESCRIPTION

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

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

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

[0033] Embodiment 1:

[0034] like Figures 1 to 6 As shown, a temperature control device for coating processing of graphite negative electrode material includes a stirring tank 1, a kiln 2 and a thermal circulation mechanism 3. The stirring tank 1 mixes graphite negative electrode material and asphalt coating material, and carbonizes the graphite negative electrode material and asphalt. A temperature measuring unit is arranged in the stirring tank 1. The kiln 2 is coated on the outside of the stirring tank 1 to form a closed insulation chamber 21 around the kiln 2, and the insulation chamber 21 is provided with electric heating components and a thermometer. The thermal circulation mechanism 3 is arranged in the insulation chamber 21. The thermal circulation mechanism 3 adjusts and controls the temperature in the insulation chamber 21. The thermal circulation mechanism 3 includes a heat transfer component 4 placed on the side walls around the insulation chamber 21 and a thermal circulation component 5 located at the bottom of the insulation chamber 21.

[0035] It is worth mentioning here that by arranging electric heating components and a thermometer inside the kiln 2 , the temperature change inside the kiln 2 can be monitored more conveniently.

[0036] like Figure 1 As shown, the stirring kettle 1 is provided with a feed pipe 11 extending upward, and the feed pipe 11 is arranged to penetrate the top of the kiln 2 . The stirring kettle 1 is provided with a discharge pipe 12 extending downward, and the discharge pipe 12 is arranged to penetrate the bottom of the kiln 2 .

[0037] It is worth mentioning that by providing a feed pipe 11 and a discharge pipe 12 extending from the stirring tank 1, the feeding and discharging operations can be automated.

[0038] like Figure 3As shown in Figures 4 and 5, the heat transfer component 4 includes a first serpentine tube 41, a first fixed tube 42 and a guide fan 44. The first serpentine tube 41 includes a plurality of parallel first movable tubes 411 and a bellows 6. The first movable tubes 411 are arranged along the corresponding side walls of the heat preservation chamber 21. The first movable tubes 411 are arranged to be movable and adjusted along the side walls of the heat preservation chamber 21, and adjacent first movable tubes 411 are connected end to end through the bellows 6. The first fixed tube 42 is arranged parallel to the first movable tube 411, and the first fixed tube 42 is staggered with the first movable tube 411. The first fixed tubes 42 are connected through a connecting tube 43, and the two ends of the connecting tube 43 are respectively connected with the two ends of the first serpentine tube 41 through a corrugated connecting tube (61). The guide fans 44 are respectively installed at the two ends of the first serpentine tube 41. The guide fans 44 encourage the airflow in the first serpentine tube 41 to flow along a preset path.

[0039] It is worth mentioning that, by presetting the airflow path inside the heat transfer assembly 4, the heated airflow can flow inside the heat preservation chamber 21, so as to better balance the temperature at various locations;

[0040] It should be further explained that the bellows 6 and the bellows connecting tube 61 have good extensibility and pressure resistance, and do not affect the movement of the first movable tube 411 while connecting the first movable tube 411 and the connecting tube 43 .

[0041] like Figure 3 ,4,5, as shown, the first moving tubes 411 are provided with N groups, N is an even number greater than zero, and the first moving tubes 411 located at odd positions move synchronously and in the same direction, and the first moving tubes 411 located at even positions move synchronously and in the same direction.

[0042] like Figure 3 ,4,5, as shown, the first moving tube 411 located at the odd position and the first moving tube 411 located at the even position are arranged to move in the opposite direction.

[0043] It is worth mentioning that by moving the odd-numbered and even-numbered first moving tubes 411 separately, they can be brought closer or further away, making the temperature adjustment more active and free, thereby improving the efficiency of heat transfer.

[0044] like Figure 3 As shown, the first moving tube 411 is evenly and correspondingly arranged by the driver 7 and is driven to move by the moving frame 8.

[0045] like Figure 3 As shown, the driver 7 is provided with two groups, and the odd-numbered first moving tubes 411 and the even-numbered first moving tubes 411 in the heat transfer assembly 4 of each group are respectively driven to move by the corresponding driver 7 .

[0046] It is worth mentioning here that by providing relatively independently operating drivers 7 for the odd-numbered and even-numbered first moving tubes 411 , the degree of freedom in adjusting the local temperature in the heat preservation chamber 21 is increased.

[0047] like Figure 3 ,6, the thermal cycle assembly 5 includes a second serpentine tube 51 and a circulation fan 52, the second serpentine tube 51 includes a second fixed tube 511, a second movable tube 512 and a corrugated U-shaped tube 9 arranged in parallel, the second fixed tube 511 is located on both sides of the second serpentine tube 51, the second movable tube 512 is located between the second fixed tubes 511, and the corrugated U-shaped tube 9 connects the second fixed tube 511 and the second movable tube 512;

[0048] It is worth mentioning that the corrugated U-shaped tube 9 has similar performance to the corrugated tube 6 , and connects the second movable tube 512 and the second fixed tube 511 without affecting the movement of the second movable tube 512 .

[0049] like Figure 6 As shown, the circulation fan 52 is arranged at the two ends of the second serpentine tube 51. The circulation fan 52 encourages the airflow in the second serpentine tube 51 to flow along a preset path, and the two ends of the second serpentine tube 51 are connected by a horizontal connecting pipe 53.

[0050] It is worth mentioning that, through the agitation of the circulation fan 52, the heated air flow is caused to flow along a preset path at the bottom of the kiln 2, transferring the hot gas to various places.

[0051] like Figure 4 As shown in Figures 5 and 6, exhaust holes 54 are arranged on the side walls of the first serpentine tube 41 and the second serpentine tube 51.

[0052] It is worth mentioning that, by providing the exhaust holes 54 , the hot air flowing in the first serpentine tube 41 and the second serpentine tube 51 can flow out of the heat preservation chamber 21 more evenly to transfer the temperature.

[0053] like Figure 3 As shown, the second moving tubes 512 in the second serpentine tubes 51 are driven by the corresponding drivers 7 to move synchronously.

[0054] It is worth mentioning here that the middle of the second moving tube 512 can also move relatively independently with a high degree of freedom.

[0055] The working process is as follows:

[0056] The worker starts the equipment, and the graphite negative electrode material and asphalt coating material mixed in the previous step enter the mixing tank 1 from the feed pipe 11. The electric heating components in the kiln 2 start to work, heating the gas inside the insulation chamber 21, and then transfer it to the mixing tank 1 to carbonize the graphite negative electrode material and the asphalt.

[0057] Heat will be absorbed during the carbonization process, and the electric heating components need to work continuously. The temperature around the electric heating components will be relatively high. At this time, after the thermometer detects the temperature imbalance, the thermal circulation mechanism 3 starts to work, and the driver 7 starts to drive the first movable tube 411 and the second movable tube 512 to move to a space with relatively low temperature, and transfer more of the high-temperature gas to the area with lower temperature to adjust the temperature to rise. Conversely, when the temperature in a local area is too high, the first movable tube 411 and the second movable tube 512 in the high-temperature area move discretely to achieve the purpose of controlling the temperature.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A temperature control device for coating graphite negative electrode material, comprising a stirring kettle (1), characterized in that: Also includes: A kiln (2) and a heat circulation mechanism (3); The stirring kettle (1) mixes the graphite negative electrode material and the asphalt coating material, and carbonizes the graphite negative electrode material and the asphalt. A temperature measuring unit is provided in the stirring kettle (1); The kiln (2) is coated on the outside of the stirring kettle (1), forming a closed heat-insulating chamber (21) around the kiln (2), and an electric heating element and a thermometer are arranged in the heat-insulating chamber (21); The thermal circulation mechanism (3) is arranged in the heat preservation chamber (21), and the thermal circulation mechanism (3) performs temperature adjustment and temperature control on the temperature in the heat preservation chamber (21). The thermal circulation mechanism (3) comprises a heat transfer component (4) arranged on the side walls around the heat preservation chamber (21) and a thermal circulation component (5) located at the bottom of the heat preservation chamber (21).

2. The temperature control device for coating graphite negative electrode material according to claim 1, characterized in that: The stirring kettle (1) is provided with a feed pipe (11) extending upwards, and the feed pipe (11) is arranged to penetrate the top of the kiln (2); the stirring kettle (1) is provided with a discharge pipe (12) extending downwards, and the discharge pipe (12) is arranged to penetrate the bottom of the kiln (2).

3. The temperature control device for coating graphite negative electrode material according to claim 1, characterized in that: The heat transfer component (4) comprises a first serpentine tube (41), a first fixed tube (42) and a guide fan (44); The first serpentine tube (41) comprises a plurality of first movable tubes (411) and a corrugated tube (6) arranged in parallel, the first movable tubes (411) being arranged in an array along the corresponding side walls of the heat preservation chamber (21), the first movable tubes (411) being arranged to be movable and adjustable along the side walls of the heat preservation chamber (21), and adjacent first movable tubes (411) being connected end to end via the corrugated tube (6); The first fixed tube (42) is arranged parallel to the first movable tube (411), and the first fixed tube (42) and the first movable tube (411) are arranged alternately, the first fixed tubes (42) are connected via a connecting tube (43), and the two ends of the connecting tube (43) are respectively connected to the two ends of the first serpentine tube (41) via a corrugated connecting tube (61); The guide fans (44) are respectively installed at the two ends of the first serpentine tube (41), and the guide fans (44) agitate the airflow in the first serpentine tube (41) to flow along a preset path.

4. The temperature control device for coating graphite negative electrode material according to claim 3, characterized in that: The first moving tubes (411) are provided in N groups, N is an even number greater than zero, and the first moving tubes (411) located at odd positions move synchronously and in the same direction, and the first moving tubes (411) located at even positions move synchronously and in the same direction.

5. The temperature control device for coating graphite negative electrode material according to claim 4, characterized in that: The first moving tubes (411) located at odd positions are arranged to move in opposite directions to the first moving tubes (411) located at even positions.

6. The temperature control device for coating graphite negative electrode material according to claim 4, characterized in that: The first movable tubes (411) are evenly correspondingly arranged with the drivers (7) driven to move via the movable frame (8).

7. A temperature control device for coating graphite negative electrode material according to claim 6, characterized in that: The driver (7) is provided with two groups, and the odd-numbered first moving tubes (411) and the even-numbered first moving tubes (411) in the heat transfer assembly (4) of each group are respectively driven to move by the corresponding driver (7).

8. The temperature control device for coating graphite negative electrode material according to claim 7, characterized in that: The thermal circulation components (5) each comprise a second serpentine tube (51) and a circulation fan (52); the second serpentine tube (51) comprises a second fixed tube (511), a second movable tube (512) and a corrugated U-shaped tube (9) arranged in parallel; the second fixed tube (511) is located on both sides of the second serpentine tube (51); the second movable tube (512) is located between the second fixed tubes (511); and the corrugated U-shaped tube (9) connects the second fixed tube (511) and the second movable tube (512); The circulation fan (52) is arranged at the two ends of the second serpentine tube (51), and the circulation fan (52) actuates the airflow in the second serpentine tube (51) to flow along a preset path, and the two ends of the second serpentine tube (51) are connected via a horizontal connecting pipe (53).

9. The temperature control device for coating graphite negative electrode material according to claim 8, characterized in that: Exhaust holes (54) are arranged on the side walls of the first serpentine tube (41) and the second serpentine tube (51).

10. The temperature control device for coating graphite negative electrode material according to claim 8, characterized in that: The second moving tubes (512) in the second serpentine tubes (51) are all driven by the corresponding drivers (7) to move synchronously.

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