Lithium battery stirrer with coaxial eccentric double stirring rods

Abstract

The utility model discloses a lithium battery mixer with coaxial eccentric double mixing rods, which relates to the technical field of lithium battery production equipment and comprises a tank body, a top cover and a servo motor are arranged at the top of the tank body, the servo motor is arranged at the top of the top cover, and a driving end of the servo motor is connected with a connecting rod. S-shaped first stirring blades and second stirring blades distributed in a staggered mode form a three-dimensional stirring network, the contact area is enlarged, a stirring blind area is filled, meanwhile, the two arc-shaped ends of a first cutting knife cut slurry agglomerates, the stirring dead angles are reduced through the synergistic effect of the first stirring blades, the second stirring blades and the first cutting knife, and large particles are scattered; the problem that the slurry near the inner wall of the tank body is difficult to fully stir is solved, and the slurry forms turbulent flow through a complex flow field generated by revolution composite motion of the first stirring rod, so that the dispersion uniformity of active substances is further improved, and the charge-discharge efficiency and cycle life of the battery are improved.

Description

Technical Field

[0001] This utility model relates to the technical field of lithium battery production equipment, specifically a lithium battery mixer with coaxial eccentric double stirring rods. Background Technology

[0002] Lithium-ion batteries are a type of battery that uses lithium metal or lithium alloy as the negative electrode material and a non-aqueous electrolyte solution. During operation, lithium ions are inserted and extracted between the positive and negative electrodes and combine with electrons to achieve charging and discharging. The basic structure includes a positive electrode, a negative electrode, a separator, an electrolyte, and a casing. They have advantages such as high energy density, long lifespan, and relative environmental friendliness. They can be divided into primary lithium batteries and secondary lithium batteries, and are widely used in mobile phones, laptops, new energy vehicles, energy storage devices, etc., making them one of the important power sources in modern life.

[0003] In the lithium battery production process, the uniform mixing of electrode slurry plays a crucial role in battery performance, and the coaxial eccentric dual-stirring rod lithium battery mixer is the core equipment for achieving this mixing. However, existing mixers of this type have significant shortcomings. For example, although some equipment adopts a dual-stirring rod structure, the eccentric design of the two stirring rods is not reasonable enough. When stirring high-viscosity lithium battery slurry (such as positive electrode slurry containing a large number of active material particles and binders), slurry agglomeration is prone to occur, which cannot be effectively dispersed, and the slurry near the inner wall of the tank is difficult to be fully stirred. This leads to uneven distribution of active materials, which in turn affects the subsequent charge-discharge efficiency and cycle life of the lithium battery. Therefore, there is an urgent need to optimize the structure of this type of mixer to improve the stirring effect and meet the high-quality production requirements of lithium batteries. Utility Model Content

[0004] The purpose of this invention is to provide a lithium battery mixer with coaxial eccentric double stirring rods to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, this utility model provides a lithium battery mixer with coaxial eccentric double stirring rods, including a tank body, a top cover on the top of the tank body, a servo motor on the top of the top cover, a connecting rod connected to the drive end of the servo motor, and a mounting block fixedly installed on the connecting rod; a first stirring rod fixedly connected to the bottom of the mounting block, an S-shaped first stirring blade on the outer wall of the first stirring rod, and second stirring blades with a width smaller than the first stirring blade on both sides of the first stirring blade, the first stirring blade and the second stirring blade being staggered; a first cutting blade fixedly installed on the outer wall of the first stirring rod, the two ends of the second stirring blade being fixedly installed on the first cutting blade, the two ends of the first cutting blade being arc-shaped.

[0006] Furthermore, a second stirring rod is fixedly installed at the bottom end of the connecting rod, and a spiral cutting blade with a narrow top and wide bottom is fixedly installed on the outer wall of the second stirring rod.

[0007] Furthermore, the edges of both the first and second stirring blades are serrated.

[0008] Furthermore, a fixing rod is fixedly installed between the bottom ends of the two first stirring rods, and the bottom end of the spiral cutting blade is fixedly installed on the outer wall of the fixing rod.

[0009] Furthermore, a feed pipe is installed on the top of the top cover, and a discharge pipe is fixedly installed on the bottom of the tank body. Both the top of the feed pipe and the bottom of the discharge pipe are threaded with sealing caps.

[0010] Furthermore, fixing blocks are fixedly installed on both the top cover and the tank body, and fixing bolts are threadedly connected to the top of the fixing blocks.

[0011] Furthermore, a dustproof frame is fixedly installed on the top of the cover, and the servo motor is located inside the dustproof frame.

[0012] Furthermore, the outer wall of the tank is provided with three legs that are equidistantly distributed and are triangular in shape.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. In this utility model, the servo motor drives the connecting rod to rotate, causing the mounting block and the first stirring rod at the bottom to revolve eccentrically around the axis. The S-shaped first stirring blade and the staggered second stirring blade form a three-dimensional stirring network, which expands the contact area and fills the stirring blind zone. At the same time, the arc-shaped ends of the first cutting blade cut the slurry agglomerates. The three work together to reduce the stirring dead zone and break up large particles, solving the problem that the slurry near the inner wall of the tank is difficult to be fully stirred. The complex flow field generated by the revolution and compound motion of the first stirring rod makes the slurry form turbulence, which further improves the uniformity of active material dispersion and improves the battery charging and discharging efficiency and cycle life.

[0015] 2. In this utility model, the second stirring rod and the first stirring rod form a double-layer stirring structure, which expands the stirring range; the spiral cutting blade, which is narrow at the top and wide at the bottom, rotates to generate an axial flow from bottom to top, which prevents particle sedimentation and strengthens the mixing of the upper and lower layers. Its spiral blade continuously shears the slurry and breaks up agglomerates. Together with the first cutting blade, it solves the problem of dead corners and agglomeration in the inner wall stirring, ensures the uniform distribution of active materials, and improves the charging and discharging efficiency and cycle life of lithium batteries. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0018] Figure 3This is a schematic diagram of the connection structure between the first stirring rod and the first stirring blade in this utility model;

[0019] Figure 4 for Figure 2 Enlarged view of the structure at point A in the middle.

[0020] In the diagram: 1. Tank body; 2. Servo motor; 3. Connecting rod; 4. First stirring rod; 5. Second stirring rod; 6. First stirring blade; 7. Second stirring blade; 8. Spiral cutter; 9. Fixing rod; 10. Feed pipe; 11. Discharge pipe; 12. Fixing block; 13. Support leg; 14. First cutter. Detailed Implementation

[0021] 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figures 1-4 This utility model provides a technical solution:

[0023] See Figures 1-4 As shown, a lithium battery mixer with coaxial eccentric double stirring rods includes a tank 1, a top cover on the top of the tank 1, a servo motor 2 on the top of the top cover, a connecting rod 3 connected to the drive end of the servo motor 2, and a mounting block fixedly installed on the connecting rod 3; a first stirring rod 4 fixedly connected to the bottom of the mounting block, an S-shaped first stirring blade 6 on the outer wall of the first stirring rod 4, and second stirring blades 7 with a width smaller than the first stirring blade 6 on both sides of the first stirring blade 6, the first stirring blade 6 and the second stirring blades 7 being staggered from each other; a first cutting blade 14 fixedly installed on the outer wall of the first stirring rod 4, the two ends of the second stirring blades 7 fixedly installed on the first cutting blade 14, both ends of the first cutting blade 14 being arc-shaped.

[0024] When the servo motor 2 starts, it drives the connecting rod 3 to rotate, causing the mounting block to rotate synchronously. The first stirring rod 4 at the bottom of the mounting block then revolves around the axis of the connecting rod 3 using an eccentric design. At this time, the first stirring blade 6 and the second stirring blade 7 rotate with the first stirring rod 4, agitating the slurry in the tank 1. The S-shaped first stirring blade 6 increases the contact area with the slurry through its curved structure, while the second stirring blades 7, staggered on both sides, fill the agitation blind spots of the first stirring blade 6. Simultaneously, the first cutting blade 14 rotates with the first stirring rod 4, and its arc-shaped ends cut the agglomerates in the slurry during rotation, breaking large particles into smaller ones and improving the dispersion effect.

[0025] The S-shaped first stirring blade 6 and the staggered second stirring blade 7 form a three-dimensional stirring network, covering a larger area, reducing dead zones, and solving the problem that the slurry near the inner wall of the tank 1 is difficult to be fully stirred.

[0026] The combined revolution of the first stirring rod 4 can generate a complex flow field, causing the slurry to form turbulence in the tank 1, further improving the uniformity of the dispersion of active materials and improving the battery charging and discharging efficiency and cycle life.

[0027] See Figure 2 A second stirring rod 5 is fixedly installed at the bottom of the connecting rod 3, and a spiral cutting blade 8 with a narrow top and wide bottom is fixedly installed on the outer wall of the second stirring rod 5.

[0028] The second stirring rod 5, together with the first stirring rod 4, forms a double-layer stirring structure, expanding the stirring range. The spiral cutting blade 8, which is narrow at the top and wide at the bottom, generates an axial flow from bottom to top when rotating, causing the bottom slurry to turn upward, preventing particle sedimentation and enhancing the mixing effect of the upper and lower slurries. At the same time, the spiral cutting blade continuously shears the slurry during rotation, further breaking up agglomerates. Working in synergy with the first cutting blade 14, it improves the overall dispersion efficiency, solving the problem that the slurry near the inner wall of the tank 1 is difficult to be fully stirred and that slurry agglomerates cannot be effectively broken up. This ensures that the active material is evenly distributed in the electrolyte, thereby improving the charging and discharging efficiency and cycle life of the lithium battery.

[0029] See Figure 2 The edges of both the first stirring blade 6 and the second stirring blade 7 are serrated.

[0030] The serrated edges of the first stirring blade 6 and the second stirring blade 7 can generate high-frequency shearing action on the agglomerated particles in the slurry during rotation, enhancing the ability to break up large particles. At the same time, the serrated structure disrupts the laminar flow state of the slurry, forming turbulence, making the flow of the slurry in the tank 1 more complex, improving the uniformity of stirring. Working together with the first cutting blade 14 and the spiral cutting blade 8, they further refine the particle size, solve the problem of the inability to effectively disperse slurry agglomerates, and ensure that the active material is fully dispersed in the electrolyte, thereby improving the charge and discharge efficiency and cycle life of the lithium battery.

[0031] See Figure 2 A fixing rod 9 is fixedly installed between the bottom ends of the two first stirring rods 4, and the bottom end of the spiral cutter 8 is fixedly installed on the outer wall of the fixing rod 9.

[0032] The fixing rod 9 connects the two first stirring rods 4 into a rigid whole, enhancing structural stability and reducing shaking and vibration during the stirring process. This makes the movement trajectory of the first stirring blade 6 and the second stirring blade 7 more precise. At the same time, the bottom end of the spiral cutting blade 8 is fixed on the fixing rod 9, forming a continuous cutting structure from top to bottom, expanding the shearing area, improving the stirring ability of the bottom slurry, avoiding the formation of stirring dead corners at the bottom of the tank, and working in synergy with the upper stirring components to enhance the overall stirring effect. This solves the problem that the slurry near the inner wall of the tank 1 is difficult to be fully stirred, ensuring that the active material is evenly distributed in the electrolyte, thereby improving the charging and discharging efficiency and cycle life of the lithium battery.

[0033] See Figure 1-2 The top of the top cover is equipped with a feed pipe 10, and the bottom of the tank body 1 is fixedly equipped with a discharge pipe 11. The top of the feed pipe 10 and the bottom of the discharge pipe 11 are both threadedly connected with sealing caps.

[0034] The feed pipe 10 installed on the top of the top cover allows operators to accurately deliver various raw materials of lithium battery slurry into the tank 1, avoiding spillage and reducing waste and pollution. The discharge pipe 11 at the bottom of the tank 1 facilitates the rapid discharge of the slurry after it has been mixed evenly, meeting the needs of subsequent production processes. The feed pipe 10 and the discharge pipe 11 are connected by a threaded sealing cap, which can effectively prevent slurry leakage and the entry of external impurities when the mixer is working, ensuring the sealing and cleanliness of the mixing environment. At the same time, the sealing cap is easy to disassemble, making it convenient to clean and maintain the feed pipe 10 and the discharge pipe 11, ensuring the efficient operation of the entire mixing system and improving the production quality of lithium battery slurry.

[0035] See Figure 1-2 Both the top cover and the tank body 1 are fixedly installed with fixing blocks 12, and the top of the fixing blocks 12 are threaded with fixing bolts.

[0036] The top cover and the fixing block 12 on the tank body 1, together with the fixing bolts connected by the top thread, provide a detachable fastening method for the two. During equipment installation, the top cover can be firmly installed on the tank body 1, ensuring good sealing during the mixing process and preventing slurry overflow and external contamination. When the equipment needs to be inspected or cleaned, the fixing bolts can be quickly unscrewed and the top cover can be removed, making it convenient for operators to inspect, clean and maintain the stirring rod, stirring blades and other components inside the tank body 1. At the same time, this connection method has a simple structure and is easy to install and disassemble, which can effectively improve the efficiency and service life of the equipment and ensure the continuous and stable operation of the lithium battery mixer.

[0037] See Figure 1-2 A dustproof frame is fixedly installed on the top of the cover, and the servo motor 2 is located inside the dustproof frame.

[0038] The dustproof frame on the top of the cover encloses the servo motor 2, effectively preventing dust and debris from the production environment from entering the motor. This avoids dust adhering to the motor coils, bearings, and other components, preventing poor heat dissipation, malfunctions, or even short circuits caused by dust accumulation. This extends the service life of the servo motor 2, reduces the frequency of equipment downtime for maintenance due to motor failure, ensures the stable operation of the mixer, guarantees the continuity and efficiency of the lithium battery slurry mixing process, and reduces equipment maintenance costs.

[0039] See Figure 1-2 The outer wall of the tank body 1 has three legs 13 distributed at equal intervals, and the three legs 13 are triangular in shape.

[0040] The three triangular legs 13, evenly distributed on the outer wall of the tank 1, form a stable support structure. Based on the principle of triangular stability, they can effectively distribute the weight of the tank 1 and the slurry inside, preventing the equipment from tipping over due to shift in the center of gravity or vibration during the mixing process. At the same time, the three legs 13 leave a gap between the tank 1 and the ground, which is convenient for cleaning up spilled slurry and also facilitates the connection and operation of the discharge pipe 11 at the bottom of the tank 1. In addition, the evenly distributed design ensures that the tank 1 is subjected to uniform force, further enhancing the stability of the equipment during operation, providing reliable support for the mixing process, and ensuring the safe and efficient mixing of lithium battery slurry.

[0041] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A lithium battery mixer with coaxial eccentric double stirring rods, comprising a tank (1), wherein the top of the tank (1) is provided with a top cover, characterized in that: A servo motor (2) is set on the top of the top cover. The drive end of the servo motor (2) is connected to a connecting rod (3), and a mounting block is fixedly installed on the connecting rod (3). The first stirring rod (4) is fixedly connected to the bottom of the mounting block. The outer wall of the first stirring rod (4) is provided with an S-shaped first stirring blade (6). On both sides of the first stirring blade (6), there are second stirring blades (7) with a width smaller than the first stirring blade (6). The first stirring blade (6) and the second stirring blade (7) are staggered. The first cutting blade (14) is fixedly installed on the outer wall of the first stirring rod (4), and the two ends of the second stirring blade (7) are fixedly installed on the first cutting blade (14). Both ends of the first cutting blade (14) are arc-shaped.

2. The lithium battery mixer with coaxial eccentric double stirring rods as described in claim 1, characterized in that: The bottom end of the connecting rod (3) is fixedly installed with a second stirring rod (5), and the outer wall of the second stirring rod (5) is fixedly installed with a spiral cutting blade (8) that is narrow at the top and wide at the bottom.

3. A lithium battery mixer with coaxial eccentric double stirring rods as described in claim 2, characterized in that: The edges of the first stirring blade (6) and the second stirring blade (7) are both serrated.

4. A lithium battery mixer with coaxial eccentric double stirring rods as described in claim 3, characterized in that: A fixing rod (9) is fixedly installed between the bottom ends of the two first stirring rods (4), and the bottom end of the spiral cutter (8) is fixedly installed on the outer wall of the fixing rod (9).

5. A lithium battery mixer with coaxial eccentric double stirring rods as described in claim 4, characterized in that: A feed pipe (10) is installed on the top of the top cover, and a discharge pipe (11) is fixedly installed at the bottom of the tank body (1). The top of the feed pipe (10) and the bottom of the discharge pipe (11) are both threaded with sealing caps.

6. A lithium battery mixer with coaxial eccentric double stirring rods as described in claim 5, characterized in that: A fixing block (12) is fixedly installed on both the top cover and the tank body (1), and a fixing bolt is threadedly connected to the top of the fixing block (12).

7. A lithium battery mixer with coaxial eccentric double stirring rods as described in claim 6, characterized in that: A dustproof frame is fixedly installed on the top of the cover, and the servo motor (2) is located inside the dustproof frame.

8. A lithium battery mixer with coaxial eccentric double stirring rods as described in claim 7, characterized in that: The outer wall of the tank (1) is provided with three legs (13) distributed at equal intervals, and the three legs (13) are triangular in shape.

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