Reaction kettle and cathode material coating granulation equipment

Abstract

The utility model relates to the technical field of cathode material manufacturing, and discloses a reaction kettle and cathode material coating granulation equipment, the reaction kettle comprises a reaction kettle shell, an end socket, a stirring device and a heat exchange shell; a discharge hole is formed in the bottom of the reaction kettle shell; the sealing head covers the reaction kettle shell and is provided with two openings; the stirring device is arranged in the reaction kettle shell; a heat exchange coil pipe is arranged in the heat exchange shell, the heat exchange coil pipe is coiled to form an accommodating space, and the reaction kettle shell is inserted and limited in the accommodating space. According to the technical scheme, the integration level of the reaction kettle can be reduced, the reaction kettle is convenient to maintain or replace, and the internal structure is optimized, so that the electrochemical performance and the cycle performance of a negative electrode material are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of negative electrode material manufacturing, in particular to a reaction kettle and negative electrode material coating granulation equipment. Background Art

[0002] The negative electrode materials of lithium-ion batteries mainly include natural graphite, artificial graphite, and composite graphite with performance between natural graphite and artificial graphite, which is based on natural graphite and doped with other negative electrode materials. Natural graphite and artificial graphite are the main ones.

[0003] In order to improve the rate performance and cycle performance of negative electrode materials, the following methods can usually be adopted:

[0004] (1) Control the particle size of the negative electrode material. Smaller particle size can increase the specific surface area of ​​the material and enhance the reaction activity, thereby improving the capacity and rate performance.

[0005] (2) Optimize the crystal structure of the negative electrode material. The crystal structure of the negative electrode material also has an important influence on the battery performance. Optimizing the crystal structure can increase the speed of lithium ion insertion and extraction between graphite layers, thereby improving the fast charging performance of the battery.

[0006] (3) Surface carbon coating: Carbon coating on the surface of the negative electrode material can increase the conductivity and stability of the negative electrode material, thereby improving the rate performance and cycle performance of the battery.

[0007] (4) Improve the electrolyte. Improve the interface contact between the electrolyte and the negative electrode material, increase the migration rate of lithium ions in the electrolyte, and thus improve the fast charging performance of the battery.

[0008] (5) Increasing the capacity of negative electrode materials. Increasing the capacity of negative electrode materials can reduce the volume change of the battery during the charge and discharge process, thereby improving the cycle performance of the battery.

[0009] (6) Optimize the battery charging and discharging strategy. Optimizing the battery charging and discharging strategy according to the battery characteristics and application scenarios can avoid overcharging and over-discharging of the battery, thereby improving the battery's cycle performance.

[0010] The above-mentioned methods for improving the rate performance and cycle performance of negative electrode materials, including controlling material particle size, optimizing crystal structure, surface carbon coating, improving electrolyte, increasing negative electrode material capacity and optimizing charging and discharging strategies, can be used alone or in combination to achieve the best performance improvement effect.

[0011] The surface carbon coating is carried out through a coating granulation process, and the key equipment in the coating granulation process is a reactor. The reactors and related complete sets of equipment in the prior art have some technical defects: (1) The stirring device in the reactor in the prior art may cause uneven coating effect of the negative electrode material coating granulation equipment, and some materials are not completely coated, thereby affecting the quality and performance of the product, and ultimately causing uneven coating effect of the product. (2) Some equipment has a high degree of integration and belongs to a complete set of equipment. The cost of maintenance and replacement is high. Damaged parts cannot be replaced and only the complete set of equipment can be replaced. In particular, the heating devices such as heating hoods arranged on the periphery of the reactor shell are inconvenient to separate, resulting in difficulties in maintenance and replacement. (3) The coating granulation equipment in the prior art only has a reactor and a cooling kettle, with a low degree of automation and a lack of continuous production and full-process production design, resulting in low production efficiency. Utility Model Content

[0012] The main purpose of the utility model is to provide a reactor, which is used in the coating granulation process in the production process of lithium-ion battery graphite negative electrode materials, aiming to reduce the integration of the reactor, facilitate the maintenance or replacement of the reactor, optimize the internal structure, and improve the electrochemical performance and cycle performance of the negative electrode material.

[0013] In order to achieve the above-mentioned purpose, the reaction kettle proposed by the utility model comprises:

[0014] A reactor shell, wherein a discharge port is provided at the bottom of the reactor shell;

[0015] A sealing head, wherein the sealing head cover is arranged on the reactor shell, and the sealing head is provided with two openings;

[0016] A stirring device, the stirring device is arranged in the reactor shell; and

[0017] A heat exchange shell is provided with a heat exchange coil inside the heat exchange shell. The heat exchange coil is coiled to form a receiving space. The reactor shell is inserted and limited to the receiving space.

[0018] Optionally, a plurality of first temperature sensors are provided on the inner wall of the heat exchange shell, and the first temperature sensors are used to detect the temperature inside the heat exchange shell.

[0019] Optionally, the sealing head is provided with a pressure sensor, and the pressure sensor is used to detect the pressure inside the reactor shell; and / or

[0020] The sealing head is provided with a second temperature sensor, and the second temperature sensor is used to detect the temperature inside the reactor shell.

[0021] Optionally, the reactor shell is provided with a plurality of first supports, the heat exchange shell is provided with a plurality of second supports, and each of the first supports is hung on one of the second supports.

[0022] The utility model also provides a negative electrode material coating granulation device, the negative electrode material coating granulation device comprising:

[0023] A base, the base comprising a first working surface, a second working surface and a material collection bin arranged up and down;

[0024] A heating reaction kettle, comprising the reaction kettle as described above, wherein the heating reaction kettle is mounted on the first work surface;

[0025] A cooling reactor, comprising the reactor as described above, wherein the cooling reactor is mounted on the second work surface;

[0026] A driving assembly, the driving assembly is used to drive the stirring device of the heating reactor and the stirring device of the cooling reactor to rotate; and

[0027] A material conveying device, one end of which is communicated with the discharge port of the heating reactor, and the other end of which is communicated with at least one opening of the cooling reactor.

[0028] Optionally, the material conveying device is a conveying pipe, one end of the conveying pipe is connected to the discharge port of the heating reactor, and the other end of the conveying pipe is connected to an opening of the cooling reactor.

[0029] Optionally, the material conveying device includes a discharge valve and two discharge hoses connected to the discharge valve, the discharge valve is arranged at the discharge port of the heating reactor, and one end of the two discharge hoses away from the discharge valve is respectively connected to the two openings of the cooling reactor.

[0030] Optionally, the discharge valve is provided with three outlets, and the two discharge hoses are connected to two of the outlets of the discharge valve;

[0031] The driving assembly includes a driving motor and a first transmission assembly and a second transmission assembly connected to the driving motor;

[0032] The stirring device of the heating reaction kettle comprises a first stirring rod, a part of the structure of the first stirring rod passes through the discharge port of the heating reaction kettle and another outlet of the discharge valve and is connected to the first transmission assembly;

[0033] The stirring device of the cooling reactor comprises a second stirring rod, and a part of the structure of the second stirring rod passes through the head of the cooling reactor and is connected to the second transmission assembly.

[0034] Optionally, the head of the heating reactor is provided with a bearing end cover, and one end of the first stirring rod away from the first transmission assembly is inserted into the bearing end cover.

[0035] Optionally, the negative electrode material coating granulation equipment further comprises an exhaust gas collecting device, wherein the exhaust gas collecting device is arranged on the first work surface, and an air inlet of the exhaust gas collecting device is connected to one of the openings of the heating reactor.

[0036] In the technical solution of the utility model, the reactor shell and the heat exchange shell are split structures, and the reactor shell insertion limit is located in the accommodating space formed by the coiling of the heat exchange coil, so that the reactor shell and the heat exchange shell can be easily separated, reducing the integration of the reactor and facilitating the maintenance or replacement of the reactor.

[0037] The technical solution of the utility model also provides a negative electrode material coating granulation equipment used in the production process of lithium-ion battery graphite negative electrode material, which realizes continuous production, reduces energy consumption, improves coating effect, and thus improves the electrochemical performance and cycle performance of the negative electrode material. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art 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 the structures shown in these drawings without paying creative work.

[0039] Figure 1 This is a schematic structural diagram of an embodiment of a reaction kettle provided by the utility model;

[0040] Figure 2 It is a structural schematic diagram of the reactor shell;

[0041] Figure 3 is a structural schematic diagram of a heat exchange shell;

[0042] Figure 4 A schematic structural diagram of an embodiment of the negative electrode material coating and granulation equipment provided by the utility model;

[0043] Figure 5 A schematic structural diagram of another embodiment of the negative electrode material coating and granulation equipment provided by the utility model;

[0044] Figure 6 for Figure 5 The structural diagram of the material conveying device;

[0045] Figure 7A schematic structural diagram of another embodiment of the negative electrode material coating and granulation equipment provided by the utility model;

[0046] Figure 8 for Figure 7 Schematic diagram of structural decomposition (partial structure);

[0047] Fig. 9 It is a schematic diagram of the structure of the exhaust gas collection device.

[0048] Description of Figure Numbers:

[0049]

[0050]

[0051] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0052] 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 of 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.

[0053] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0054] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their 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 at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0055] Please refer to Figures 1 to 3The utility model proposes a reactor 100, comprising a reactor shell 1, a head 2, a stirring device and a heat exchange shell 3; a discharge port 101 is provided at the bottom of the reactor shell 1; the head 2 is covered on the reactor shell 1, and the head 2 is provided with two openings 201; the stirring device is arranged in the reactor shell 1; a heat exchange coil 4 is arranged in the heat exchange shell 3, and the heat exchange coil 4 is coiled to form a receiving space, and the reactor shell 1 is inserted and limited in the receiving space.

[0056] The upper end of the reactor shell 1 is a cylindrical structure, and the lower end is a conical structure, so that the material can be discharged from the discharge port 101 at the bottom of the reactor shell 1 . The shape of the heat exchange shell 3 is compatible with the reactor shell 1 .

[0057] The two openings 201 on the sealing head 2 can be used for feeding or exhausting according to usage requirements.

[0058] The heat exchange coil 4 can flow different heat exchange media according to usage requirements. For example, a heating medium can be circulated when the reactor shell 1 needs to be heated, and a cooling medium can be circulated when the reactor shell 1 needs to be cooled. In this way, the reactor 100 provided in this embodiment can be used for the heating step and the cooling step in the coating granulation process.

[0059] In this embodiment, the reactor shell 1 and the heat exchange shell 3 are split structures, and the reactor shell 1 is inserted into the accommodation space formed by the coiled heat exchanger coil 4, so that the reactor shell 1 and the heat exchange shell 3 can be easily separated, which reduces the integration of the reactor 100 and facilitates the maintenance or replacement of the reactor 100.

[0060] Specifically, in one embodiment of the present invention, please refer to Figure 1 to Figure 2 The stirring device is composed of a stirring shaft, a spiral blade 14 and a blade bracket 15. A plurality of blade brackets 15 are provided, and the plurality of blade brackets 15 are arranged on the stirring shaft at intervals up and down. The spiral blades 14 are arranged around the stirring shaft. Both ends of each blade bracket 15 are connected to the spiral blades 14, so as to maintain the overall rigidity of the stirring device, so that when the stirring shaft rotates along its own axial direction, the spiral blades 14 can keep revolving along the axial direction of the stirring shaft, thereby ensuring the stirring effect, so that the materials in the reactor 100 are evenly mixed, the coating effect is good, and the quality and performance of the product are guaranteed.

[0061] Further, in one embodiment of the present invention, please refer to Figure 3 The inner wall of the heat exchange shell 3 is provided with a plurality of first temperature sensors 302 , and the first temperature sensors 302 are used to detect the temperature inside the heat exchange shell 3 .

[0062] In order to ensure the stability and controllability of the reaction process, in one embodiment of the present invention, please refer to Figure 1 to Figure 2The head 2 is provided with a pressure sensor 202 and a second temperature sensor 203. The pressure sensor 202 is used to detect the pressure inside the reactor shell 1, and the second temperature sensor 203 is used to detect the temperature inside the reactor shell 1, so as to monitor the pressure change and temperature change in the reactor 100 in real time, so as to facilitate relevant staff to keep the pressure and temperature in the reactor 100 within a safe range and ensure the stability and controllability of the reaction process.

[0063] Further, in one embodiment of the present invention, please refer to Figures 1 to 3 The reactor shell 1 is provided with a plurality of first supports 102, and the heat exchange shell 3 is provided with a plurality of second supports 301. Each first support 102 is hung on a second support 301. Through the cooperation of the first supports 102 and the second supports 301, the insertion depth of the reactor shell 1 into the heat exchange shell 3 can be limited, and the heat exchange shell 3 bears the gravity of the reactor shell 1, so as to avoid the gravity of the reactor shell 1 being applied to the heat exchange coil 4, so as to improve the service life of the heat exchange coil 4.

[0064] Please refer to Figures 1 to 9 The utility model also proposes a negative electrode material coating granulation device 1000, which includes a base 5, a heating reactor 200, a cooling reactor 300, a driving component and a material conveying device; the base 5 includes a first work surface, a second work surface and a material collecting bin 501 arranged up and down; the heating reactor 200 is mounted on the first work surface; the cooling reactor 300 is mounted on the second work surface; the driving component is used to drive the stirring device of the heating reactor 200 and the stirring device of the cooling reactor 300 to rotate; one end of the material conveying device is connected to the discharge port 101 of the heating reactor 200, and the other end of the material conveying device is connected to at least one opening 201 of the cooling reactor 300. Among them, the specific structures of the heating reactor 200 and the cooling reactor 300 refer to the above-mentioned embodiments. Since the negative electrode material coating granulation equipment 1000 adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here. Moreover, since the heating reactor 2100 and the cooling reactor 300 adopt the same structure, it is more convenient for subsequent modification and design.

[0065] In this embodiment, it is intended to provide an energy-saving complete set of equipment to achieve continuous production, improve production efficiency, and improve the electrochemical performance and cycle performance of the negative electrode material through the technical improvement of the reactor 100. The specific production process is as follows: the material enters the reactor shell 1 through the opening 201 for feeding through the heating reactor 200, and is vacuumized, and then the protective gas is introduced. After that, the driving component drives the stirring device of the heating reactor 200 to rotate, so that the material is evenly mixed, and at the same time, the heating medium is circulated in the heat exchange coil 4 of the heating reactor 200 for heating. After the reaction reaches a predetermined time, the material is transported to the cooling reactor 300 by the material conveying device, and the cooling medium is circulated in the heat exchange coil 4 of the cooling reactor 300 for cooling. At the same time, the driving component drives the stirring device of the cooling reactor 300 to rotate, so that the material is fully cooled. After cooling to the preset temperature, the material is transported from the discharge port 101 of the cooling reactor 300 to the material collection bin 501 and transported to the next process.

[0066] Further, in one embodiment of the present invention, please refer to Figure 4 The material conveying device is a conveying pipe 6, one end of the conveying pipe 6 is connected to the discharge port 101 of the heating reactor 200, and the other end of the conveying pipe 6 is connected to an opening 201 of the cooling reactor 300. The conveying pipe 6 can be easily connected and disassembled with the discharge port 101 of the heating reactor 200 and the opening 201 of the cooling reactor 300.

[0067] In order to reduce the floor space, in one embodiment of the present invention, please refer to Figure 5 to Figure 6 The material conveying device includes a discharge valve 7 and two discharge hoses 8 connected with the discharge valve 7. The discharge valve 7 is arranged at the discharge port 101 of the heating reactor 200. One end of the two discharge hoses 8 away from the discharge valve 7 is respectively connected with two openings 201 of the cooling reactor 300. Since the discharge hoses 8 can be bent, when conveying materials through the discharge hoses 8, the position of the cooling reactor 300 can be adjusted so that the projections of the cooling reactor 300 and the heating reactor 200 in the vertical direction overlap as much as possible, thereby reducing the overall footprint of the equipment and increasing the operating space of the base 5.

[0068] In order to reduce production costs, in one embodiment of the present utility model, please refer to Figures 7 and 8, the discharge valve 7 is provided with three outlets, and two discharge hoses 8 are connected to two of the outlets of the discharge valve 7; the driving assembly includes a driving motor 9 and a first transmission assembly 10 and a second transmission assembly 11 connected to the driving motor 9; the stirring device of the heating reactor 200 includes a first stirring rod 12, and a part of the structure of the first stirring rod 12 passes through the discharge port 101 of the heating reactor 200 and another outlet of the discharge valve 7 and is connected to the first transmission assembly 10; the stirring device of the cooling reactor 300 includes a second stirring rod 13, and a part of the structure of the second stirring rod 13 passes through the head 2 of the cooling reactor 300 and is connected to the second transmission assembly 11. Through the cooperation of the first transmission assembly 10 and the second transmission assembly 11, the stirring device of the heating reactor 200 and the stirring device of the cooling reactor 300 can be driven to rotate simultaneously by only one driving motor 9, thereby reducing the overall use cost of the equipment.

[0069] Further, in one embodiment of the present invention, please refer to Figures 7 and 8 The head 2 of the heating reactor 200 is provided with a bearing end cover 204, and the end of the first stirring rod 12 away from the first transmission assembly 10 is inserted into the bearing end cover 204, so as to reduce the friction between the first stirring rod 12 and the head 2 of the heating reactor 200 when the stirring device of the heating reactor 200 rotates, thereby improving the overall service life of the equipment.

[0070] In order to protect the environment, in one embodiment of the present utility model, please refer to Figure 4 and Fig. 9 The negative electrode material coating granulation equipment 1000 also includes an exhaust gas collection device 16, which is arranged on the first work surface. The air inlet of the exhaust gas collection device 16 is connected to the opening 201 of the heating reactor 200 for exhaust. A filter 1601 is arranged in the exhaust gas collection device 16. The exhaust gas generated by the heating reactor 200 is filtered and discharged to avoid pollution to the environment.

[0071] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A reaction kettle, characterized in that: include: A reactor shell, wherein a discharge port is provided at the bottom of the reactor shell; A sealing head, wherein the sealing head cover is arranged on the reactor shell, and the sealing head is provided with two openings; A stirring device, wherein the stirring device is arranged in the shell of the reactor; as well as A heat exchange shell is provided with a heat exchange coil inside the heat exchange shell. The heat exchange coil is coiled to form a receiving space. The reactor shell is inserted and limited to the receiving space.

2. The reactor according to claim 1, characterized in that: The inner wall of the heat exchange shell is provided with a plurality of first temperature sensors, and the first temperature sensors are used to detect the temperature inside the heat exchange shell.

3. The reactor according to claim 1, characterized in that: The sealing head is provided with a pressure sensor, and the pressure sensor is used to detect the pressure inside the reactor shell; and / or The sealing head is provided with a second temperature sensor, and the second temperature sensor is used to detect the temperature inside the reactor shell.

4. The reactor according to claim 1, characterized in that: The reactor shell is provided with a plurality of first supports, and the heat exchange shell is provided with a plurality of second supports, and each of the first supports is hung on one of the second supports.

5. A negative electrode material coating granulation device, characterized in that: include: A base, the base comprising a first working surface, a second working surface and a material collection bin arranged up and down; A heating reaction kettle, comprising the reaction kettle according to any one of claims 1 to 4, wherein the heating reaction kettle is mounted on the first work surface; A cooling reactor, comprising the reactor according to any one of claims 1 to 4, wherein the cooling reactor is mounted on the second work surface; A driving assembly, the driving assembly is used to drive the stirring device of the heating reactor and the stirring device of the cooling reactor to rotate; as well as A material conveying device, one end of which is communicated with the discharge port of the heating reactor, and the other end of which is communicated with at least one opening of the cooling reactor.

6. The negative electrode material coating granulation equipment according to claim 5, characterized in that: The material conveying device is a conveying pipeline, one end of which is connected to the discharge port of the heating reactor, and the other end of which is connected to an opening of the cooling reactor.

7. The negative electrode material coating granulation equipment according to claim 5, characterized in that: The material conveying device includes a discharge valve and two discharge hoses connected to the discharge valve. The discharge valve is arranged at the discharge port of the heating reactor. One end of the two discharge hoses away from the discharge valve is respectively connected to the two openings of the cooling reactor.

8. The negative electrode material coating granulation equipment according to claim 7, characterized in that: The discharge valve is provided with three outlets, and the two discharge hoses are connected to two of the outlets of the discharge valve; The driving assembly includes a driving motor and a first transmission assembly and a second transmission assembly connected to the driving motor; The stirring device of the heating reaction kettle comprises a first stirring rod, a part of the structure of the first stirring rod passes through the discharge port of the heating reaction kettle and another outlet of the discharge valve and is connected to the first transmission assembly; The stirring device of the cooling reactor comprises a second stirring rod, and a part of the structure of the second stirring rod passes through the head of the cooling reactor and is connected to the second transmission assembly.

9. The negative electrode material coating granulation equipment according to claim 8, characterized in that: The head of the heating reactor is provided with a bearing end cover, and one end of the first stirring rod away from the first transmission assembly is plugged into the bearing end cover.

10. The negative electrode material coating granulation equipment according to claim 5, characterized in that: The negative electrode material coating granulation equipment also includes a tail gas collection device, which is arranged on the first work surface, and the air inlet of the tail gas collection device is connected to one of the openings of the heating reactor.

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