A mixer for long-life lithium-rich manganese-based positive electrode material

Abstract

The utility model discloses a long -life lithium -rich manganese base positive electrode material is with mixer relates to lithium battery production related technical field, the utility model discloses a shell and stirring bucket subassembly, the shell is built -in stirring bucket subassembly, and the inside stirring bucket subassembly is provided with mill ball and pivot, and the pivot periphery is fixedly connected with the stirring bar, and the stirring bar end all is fixedly connected with the mill head, and the stirring bucket subassembly includes the baffle, the blanking plate, the end cap no.

Description

Technical Field

[0001] This utility model belongs to the technical field of lithium battery production, and in particular relates to a mixing machine for long-life lithium-rich manganese-based cathode materials. Background Technology

[0002] Lithium-rich manganese-based cathode materials are core materials for next-generation high-energy-density lithium batteries. They possess advantages such as high energy density (achieving a discharge specific capacity of up to 300 mAh / g through a dual redox mechanism of transition metals and oxygen anions, far exceeding lithium iron phosphate and ternary materials, with an energy density increase of over 30%) and low cost (primarily manganese, with low precious metal content, and a cost per watt-hour close to lithium iron phosphate). Their technological advancements and industrial applications have become a focus of the industry. Lithium-rich manganese-based cathode materials are made by mixing transition metal salts (such as lithium acetate, nickel acetate, and manganese acetate) with lithium sources (such as lithium carbonate and lithium hydroxide) in a specific ratio, while adding coating materials (such as alumina and silicon dioxide) to improve surface stability. However, currently, mainstream long-life lithium-rich manganese-based cathode material mixing machines still have the following problems during the mixing process: Since long-life lithium-rich manganese-based cathode materials are made by mixing various powdered raw materials, if the raw material particles are too large, it will increase the length of the lithium-ion diffusion path, leading to an increase in solid-phase diffusion resistance, thereby reducing the rate performance and causing the subsequent electrode performance to decline. Traditional long-life lithium-rich manganese-based cathode materials cannot grind large raw material particles during mixing, resulting in substandard quality of lithium-rich manganese-based cathode materials. Traditional long-life lithium-rich manganese-based cathode materials are mixed using a mixer, which typically involves using a stirring rod to mix the raw materials. While this mixing method can thoroughly mix various raw materials, it takes a long time. Because the raw materials have a certain mass, the mixer will be subjected to a large gravitational force when mixing. The mixer mainly relies on the support legs for support, and the support legs generally do not have a cushioning structure. During long-term use, the support legs may be damaged due to pressure, which may cause the mixer to become unstable or even tip over.

[0003] To address these issues, we provide a long-life mixing machine for lithium-rich manganese-based cathode materials. Utility Model Content

[0004] The purpose of this invention is to provide a long-life mixing machine for lithium-rich manganese-based cathode materials. By setting up support legs, auxiliary legs, shock-absorbing pads, mixing tank assembly, transmission gears, transmission motor, mixing rod, grinding head and grinding balls, it solves the problems of existing long-life mixing machines for lithium-rich manganese-based cathode materials, such as the inability to grind large particles of raw materials while mixing, low mixing efficiency, and significant losses caused by damage to support legs.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: This utility model is a mixer for long-life lithium-rich manganese-based cathode materials, including a shell and a mixing tank assembly; the mixing tank assembly is arranged inside the shell, the mixing tank assembly is filled with grinding balls, and a rotating shaft is also arranged inside the mixing tank assembly. A spiral linear array of stirring rods is fixedly connected to the circumference of the rotating shaft, and a grinding head is fixedly connected to the end of all the stirring rods away from the rotating shaft. Before mixing, various raw materials for lithium-rich manganese-based cathode materials are added to the mixing tank assembly. During mixing, the rotating shaft drives the stirring rod to rotate, stirring the raw materials and grinding balls. The grinding head rotates together with the stirring rod. Under the combined action of the stirring rod and the grinding head, the raw materials are stirred and mixed. At the same time, larger particles of raw materials are squeezed and ground into smaller particles by the grinding head and grinding balls. The mixing tank assembly includes a superior arc-shaped baffle plate, and a inferior arc-shaped discharge plate is fixedly connected to the top of the baffle plate. The cross-sections of the baffle plate and the discharge plate can be combined to form a complete circle. One of the adjacent ends of the baffle plate and the discharge plate is fixedly connected to a gear-shaped end cap rotatably connected to the outer shell. The other adjacent end of the baffle plate and the discharge plate is fixedly connected to an end cap rotatably connected to the outer shell. When adding raw materials, the amount of raw materials added must not exceed the higher end of the baffle plate. While the stirring rod rotates to mix the materials, the mixing drum assembly rotates back and forth in a small amplitude to shake the raw materials inside the mixing drum assembly and speed up the mixing. After the mixing is completed, rotate the mixing drum assembly so that the discharge plate is located below the baffle plate. The mixed raw materials can then be discharged through the holes on the discharge plate.

[0006] Furthermore, a transmission gear is rotatably connected to the inner end wall of the outer casing above the first end cover. The transmission gear meshes with the first end cover. A transmission motor is fixedly connected to the end wall of the outer casing near the transmission gear. The output shaft of the transmission motor is connected to the end of the transmission gear that is close to it. When mixing materials, the drive motor is started. The output shaft of the drive motor rotates back and forth, driving the drive gear to rotate back and forth. Since the drive gear and end cover one mesh with each other, and the size of the drive gear is much smaller than the size of end cover one, end cover one will rotate back and forth slightly, which in turn causes the entire mixing tank assembly to rotate back and forth slightly.

[0007] Furthermore, the rotating shaft is rotatably connected to both end caps 1 and 2 at its two ends, and the rotating shaft is also rotatably connected to the two inner end walls of the outer shell. A stirring motor is fixedly connected to one end of the outer shell near end cap 1, and the stirring motor is drivenly connected to the end of the rotating shaft near it. Start the mixing motor; the output shaft of the mixing motor will rotate, which will drive the rotating shaft to perform the mixing operation.

[0008] Furthermore, a feeding port is provided through the upper part of the end wall of the outer casing away from the drive motor. The lower end of the feeding port is lower than the lower end of the material plate. A sealing cap is threaded through the end cover near the feeding port. Remove the cap to add the raw materials into the mixing tank assembly through the feeding port.

[0009] Furthermore, a hopper is fixedly connected inside the outer shell located below the mixing tank assembly, and the discharge port of the hopper extends downward through the outer shell; The material moving out of the mixing tank assembly from the feeding plate can then be moved out of the mixer through the feeding hopper.

[0010] Furthermore, support legs are fixedly connected to the four corners of the outer shell, and auxiliary legs are fixedly connected to the bottom of the outer shell near the four corners. Shock-absorbing pads are fixedly connected to the bottom of all the support legs and auxiliary legs. During the feeding and mixing process, the shock-absorbing pads buffer and dampen the support legs and auxiliary legs, preventing damage to the support legs during long-term support work. If the support legs are damaged, the auxiliary legs can temporarily provide support to prevent the mixer from tipping over due to instability.

[0011] This utility model has the following beneficial effects: This invention solves the problem of grinding large particles of material while mixing by setting up a stirring rod, a grinding head, and grinding balls. When mixing raw materials, the stirring rod rotates to agitate the raw materials and grinding balls, and the grinding head rotates together with the stirring rod. Under the combined action of the stirring rod and the grinding head, the raw materials are stirred and mixed. At the same time, larger particles of raw materials are squeezed and ground into smaller particles by the grinding head and grinding balls, thus achieving the purpose of grinding large particles of raw materials while mixing.

[0012] This invention solves the problem of low mixing efficiency by setting up a mixing tank assembly, a transmission gear, and a transmission motor. While the mixing rod rotates to mix the materials, the transmission motor starts, and the output shaft of the transmission motor reciprocates, driving the transmission gear to reciprocate, which in turn causes the mixing tank assembly to rotate slightly back and forth, shaking the raw materials inside the mixing tank assembly and thus accelerating the mixing efficiency.

[0013] This invention solves the problem of significant losses such as the mixer tipping over and material wasting caused by the setting of support legs, auxiliary legs, and shock-absorbing pads. During the feeding and mixing process, the shock-absorbing pads buffer and dampen the support legs and auxiliary legs, preventing damage to the support legs during long-term support work. If the support legs are damaged, the auxiliary legs can temporarily provide support to prevent the mixer from tipping over due to instability and damage to the mixer.

[0014] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of a mixer for a long-life lithium-rich manganese-based cathode material.

[0017] Figure 2 This is a cross-sectional view of the outer shell.

[0018] Figure 3 for Figure 2 A structural diagram from another perspective.

[0019] Figure 4 This is a structural breakdown diagram of the mixing tank assembly.

[0020] Figure 5 This is a cross-sectional view of the outer shell, stirring plate, and feeding plate.

[0021] Figure 6 This is a schematic diagram of the working state of the mixer.

[0022] The attached diagram lists the components represented by each number as follows: 1. Outer shell; 101. Feed port; 102. Support leg; 103. Auxiliary leg; 104. Shock-absorbing pad; 2. Mixing tank assembly; 201. Baffle plate; 202. Discharge plate; 203. End cap one; 204. End cap two; 205. Sealing cap; 3. Transmission gear; 4. Transmission motor; 5. Discharge hopper; 6. Rotating shaft; 601. Mixing rod; 602. Grinding head; 603. Mixing motor; 7. Grinding ball. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model. Specific Implementation Example 1

[0024] Please see Figure 1-6This utility model is a mixing machine for long-life lithium-rich manganese-based cathode materials, including a shell 1 and a mixing tank assembly 2; the mixing tank assembly 2 is arranged inside the shell 1, the mixing tank assembly 2 is filled with grinding balls 7, the mixing tank assembly 2 is also arranged inside the mixing tank assembly 2, and a rotating shaft 6 is fixedly connected to the circumference of the rotating shaft 6 with a spiral linear array of stirring rods 601, and all the ends of the stirring rods 601 away from the rotating shaft 6 are fixedly connected with grinding heads 602. The outer casing 1 provides protection for the entire mixer and prevents dust generated during the mixing process from escaping into the air. Before mixing, various raw materials of lithium-rich manganese-based cathode material are added to the mixing tank assembly 2. During mixing, the rotating shaft 6 rotates, driving the stirring rod 601 to rotate, stirring the raw materials and grinding balls 7. The grinding head 602 rotates together with the stirring rod 601. Under the combined action of the stirring rod 601 and the grinding head 602, the raw materials are stirred and mixed. At the same time, due to the continuous movement of the grinding balls 7 and the grinding head 602, larger particles of raw materials are squeezed and ground into smaller particles by the grinding head 602 and the grinding balls 7 when passing through the gap between the grinding head 602 and the grinding balls 7.

[0025] Among them, such as Figure 2-6 As shown, the rotating shaft 6 is rotatably connected to the end caps 203 and 204 at both ends, and the rotating shaft 6 is also rotatably connected to the two inner end walls of the outer shell 1. The stirring motor 603 is fixedly connected to one end of the outer shell 1 near the end cap 203, and the stirring motor 603 is connected to the end of the rotating shaft 6 near it via a transmission connection. The outer casing 1 provides support for the rotating shaft 6. When the stirring motor 603 is started, the output shaft of the stirring motor 603 rotates, which drives the rotating shaft 6 to rotate and carry out the mixing work.

[0026] Among them, such as Figure 5 As shown, a hopper 5 is fixedly connected inside the outer shell 1 located below the mixing tank assembly 2, and the discharge port of the hopper 5 extends downward through the outer shell 1. After mixing, the raw materials move from the mixing tank assembly 2 to the feed inlet of the hopper 5, and then move out of the mixer from the discharge outlet along the channel of the hopper 5.

[0027] The working principle of this embodiment is as follows: Before mixing, various raw materials of lithium-rich manganese-based cathode material are added into the mixing tank assembly 2. After the material is added, the stirring motor 603 is started. The output shaft of the stirring motor 603 rotates, which drives the rotating shaft 6 to rotate, and then drives the stirring rod 601 to rotate, stirring the raw materials and grinding balls 7. The grinding head 602 rotates together with the stirring rod 601. Under the combined action of the stirring rod 601 and the grinding head 602, the raw materials are stirred and mixed. At the same time, due to the continuous movement of the grinding balls 7 and the grinding head 602, larger particles of raw materials are squeezed and ground into smaller particles by the grinding head 602 and the grinding balls 7 when passing through the gap between the grinding head 602 and the grinding balls 7. After the raw materials are ground and mixed, they move from the mixing tank assembly 2 to the feed port of the hopper 5, and then move out of the mixer from the discharge port along the channel of the hopper 5. Specific Implementation Example 2

[0028] Please see Figure 2-4 Based on the first specific embodiment, the mixing tank assembly 2 includes a superior arc-shaped baffle plate 201, a inferior arc-shaped discharge plate 202 fixedly connected to the top of the baffle plate 201, the cross-sections of the baffle plate 201 and the discharge plate 202 can be combined into a complete circle, one of the adjacent ends of the baffle plate 201 and the discharge plate 202 are fixedly connected to a gear-shaped end cap 203 rotatably connected to the outer shell 1, and the other adjacent ends of the baffle plate 201 and the discharge plate 202 are fixedly connected to an end cap 204 rotatably connected to the outer shell 1. When feeding raw materials, the amount of raw materials added must not exceed half the height of the baffle plate 201 to prevent the material from flying out of the holes on the feed plate 202 during mixing. While the stirring rod 601 rotates to mix the materials, the mixing drum assembly 2 rotates back and forth in a small amplitude to shake the raw materials in the mixing drum assembly 2 and speed up the mixing. After the mixing is completed, the mixing drum assembly 2 is rotated so that the feed plate 202 is located below the baffle plate 201. The mixed raw materials can then enter the feed hopper 5 through the holes on the feed plate 202 for feeding.

[0029] Among them, such as Figure 2 As shown, a transmission gear 3 is rotatably connected to the inner end wall of the outer shell 1 located above the end cover 203. The transmission gear 3 and the end cover 203 mesh with each other. A transmission motor 4 is fixedly connected to the end wall of the outer shell 1 near the transmission gear 3. The output shaft of the transmission motor 4 is connected to the end of the transmission gear 3 near it. When mixing, the drive motor 4 is started. The output shaft of the drive motor 4 rotates back and forth, driving the drive gear 3 to rotate back and forth. Since the drive gear 3 and the end cover 203 mesh with each other, and the size of the drive gear 3 is much smaller than the size of the end cover 203, the end cover 203 will rotate back and forth slightly, thereby causing the entire mixing tank assembly 2 to rotate back and forth slightly.

[0030] Among them, such as Figure 1-5As shown, a feeding port 101 is provided through the upper part of the end wall of the outer casing 1 away from the drive motor 4. The lower end of the feeding port 101 is lower than the lower end of the material plate 202. A sealing cap 205 is threaded through the end cover 204 near the feeding port 101. Since the lower end of the feeding port 101 is lower than the lower end of the feeding plate 202, the amount of raw material added will not exceed the higher end of the baffle plate 201 when feeding. The material can be added into the mixing tank assembly 2 from the feeding port 101 by removing the cover 205. If the raw material accumulates near the feeding port 101 in the mixing tank assembly 2, the drive motor 4 can be started. The output shaft of the drive motor 4 will rotate back and forth to shake the mixing tank assembly 2, so that the raw material can be evenly distributed in the mixing tank assembly 2.

[0031] The operation process in this embodiment is as follows: When adding materials, remove the cover 205 to add raw materials into the mixing tank assembly 2 through the feeding port 101. If raw materials accumulate near the feeding port 101 in the mixing tank assembly 2, start the drive motor 4. The output shaft of the drive motor 4 reciprocates, driving the drive gear 3 to reciprocate. Since the drive gear 3 and the end cover 203 mesh with each other, and the size of the drive gear 3 is much smaller than the size of the end cover 203, the end cover 203 will reciprocate slightly, thereby causing the entire mixing tank to rotate. The mixing drum assembly 2 rotates back and forth at a small amplitude (10°-15°) to ensure that the raw materials are evenly distributed within it. After feeding, the mixing drum assembly 2 is reset and the cover 205 is reinstalled before mixing. The mixing drum assembly 2 rotates back and forth at a small amplitude to shake the raw materials within it, thus accelerating the mixing speed. After mixing is complete, the mixing drum assembly 2 rotates so that the discharge plate 202 is positioned below the baffle plate 201. The mixed raw materials can then be fed into the discharge hopper 5 through the holes in the discharge plate 202. Specific Implementation Example 3

[0032] Please see Figure 1 Based on specific embodiment one and specific embodiment two, support legs 102 are fixedly connected at the four corners of the outer shell 1, and auxiliary legs 103 are fixedly connected at the bottom of the outer shell 1 near the four corners. Shock-absorbing pads 104 are fixedly connected to the bottom of all support legs 102 and auxiliary legs 103.

[0033] The operation process of this embodiment is as follows: During the feeding and mixing process, the shock-absorbing pad 104 buffers and dampens the support leg 102 and the auxiliary leg 103, preventing the support leg 102 from being damaged during long-term support work. If the support leg 102 is damaged, the auxiliary leg 103 can temporarily play a supporting role to prevent the mixer from tipping over due to instability of the center of gravity, so as to avoid damage to the mixer and significant losses.

[0034] The above are merely preferred embodiments of the present utility model and do not limit the present utility model. Any modifications, equivalent substitutions, or improvements made to the technical solutions described in the foregoing embodiments, or to some of the technical features, shall fall within the protection scope of the present utility model.

Claims

1. A long-life lithium-rich manganese-based positive electrode material mixer, comprising a shell (1) and a stirring barrel assembly (2); characterized in that: The outer shell (1) is provided with a stirring tank assembly (2), the stirring tank assembly (2) is filled with grinding balls (7), the stirring tank assembly (2) is also provided with a rotating shaft (6), the rotating shaft (6) is fixedly connected to a stirring rod (601) arranged in a spiral linear array, and all the ends of the stirring rods (601) away from the rotating shaft (6) are fixedly connected to a grinding head (602). The mixing tank assembly (2) includes a large arc-shaped baffle plate (201), and a small arc-shaped discharge plate (202) is fixedly connected to the top of the baffle plate (201). The cross-sections of the baffle plate (201) and the discharge plate (202) can be combined into a complete circle. One of the close ends of the baffle plate (201) and the discharge plate (202) is fixedly connected to a gear-shaped end cap (203) that is rotatably connected to the outer shell (1). The other close end of the baffle plate (201) and the discharge plate (202) is fixedly connected to an end cap (204) that is rotatably connected to the outer shell (1).

2. The mixer for a long-life lithium-rich manganese-based positive electrode material according to claim 1, characterized by: A transmission gear (3) is rotatably connected to the inner end wall of the outer shell (1) located above the end cover (203). The transmission gear (3) and the end cover (203) mesh with each other. A transmission motor (4) is fixedly connected to the end wall of the outer shell (1) near the transmission gear (3). The output shaft of the transmission motor (4) is connected to the end of the transmission gear (3) near it.

3. The mixer for long-life lithium-rich manganese-based cathode materials according to claim 1, characterized in that: The rotating shaft (6) is rotatably connected to the end caps 1 (203) and 2 (204) at both ends, and the rotating shaft (6) is also rotatably connected to the two inner walls of the outer shell (1). The stirring motor (603) is fixedly connected to one end of the outer shell (1) near the end cap 1 (203), and the stirring motor (603) is connected to the end of the rotating shaft (6) near it via a transmission connection.

4. The mixer for a long-life lithium-rich manganese-based positive electrode material according to claim 1, characterized by: The upper part of the end wall of the outer shell (1) away from the drive motor (4) is provided with a feeding port (101) in a through manner. The lower end of the feeding port (101) is lower than the lower end of the feeding plate (202). The end cover (204) is threaded with a cap (205) in a through manner near the feeding port (101).

5. The mixer for a long-life lithium-rich manganese-based positive electrode material according to claim 1, characterized by: A hopper (5) is fixedly connected inside the outer shell (1) located below the mixing tank assembly (2), and the discharge port of the hopper (5) extends downward through the outer shell (1).

6. A mixer for long-life lithium-rich manganese-based cathode materials according to claim 1, characterized in that: Support legs (102) are fixedly connected at the four corners of the outer shell (1), and auxiliary legs (103) are fixedly connected at the bottom of the outer shell (1) near the four corners. Shock-absorbing pads (104) are fixedly connected to the bottom of all the support legs (102) and auxiliary legs (103).

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