Electrode slurry stirring and feeding system device and method

Abstract

The invention discloses an electrode slurry stirring and feeding system device and method, and relates to the technical field of electrode manufacturing, the electrode slurry stirring and feeding system device comprises a tank body, and the tank body is provided with a main material feeding mechanism, a liquid auxiliary material feeding mechanism and a solid auxiliary material feeding mechanism; the bottoms of the main material feeding mechanism, the liquid auxiliary material feeding mechanism and the solid auxiliary material feeding mechanism are each provided with a feeding pipe communicated with the interior of the tank body, and each feeding pipe is provided with a speed-limiting filtering mechanism and a discharging control valve. The filtering net of the speed-limiting filtering mechanism is made of the magnetic material, when raw materials penetrate through the filtering net, the filtering net can adsorb metal particles in the raw materials, and impurities in slurry are reduced; the filter screen can swing back and forth within a certain range, the higher the swing speed is, the higher the descending speed of the raw materials is, the slower the swing speed is, and the slower the descending speed of the raw materials is, so that the effect of controlling the descending speed of the raw materials is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of electrode manufacturing, and in particular to an electrode slurry stirring and feeding system device and method. Background Art

[0002] In battery production, the quality of battery slurry directly affects battery performance. The slurry formula, dispersion uniformity, and process control are the most critical factors. The solid content and viscosity of lithium-ion battery slurry are two important parameters to measure whether the slurry is qualified. They are also the basis for setting parameters in the next coating process. The fineness of the slurry is also a critical factor. Low fineness means no scratches during the coating process. Good viscosity facilitates the slurry to adhere to the aluminum foil and copper foil. In the positive and negative electrode slurries, the dispersion and uniformity of the particulate active material directly affect the performance of the battery. The traditional method is generally to manually load the raw materials into the mixer and stir them directly. This relatively primitive slurrying method is prone to uneven dispersion due to the lack of pre-dispersion.

[0003] A Chinese utility model patent, publication number CN204702014U, discloses a convenient precision feeder comprising a hopper, the lower end of which is fixedly connected to an inverted conical feeding section, the lower end of which serves as a discharge port, a filter plate provided at the bottom of the hopper and above the feeding section, an hourglass device provided within the feeding section, and material passing through the filter plate enters the hourglass device. A plug capable of changing the cross-sectional size of the passage is provided within the feeding section and below the hourglass device, and the handle of the plug is located on the outside of the feeder. Solid powder material passes through the filter plate to remove large particles before entering the hourglass device, which effectively reduces the speed at which the powder flows downward and, in conjunction with the plug at the bottom, enables precise addition of small amounts of material, thereby improving feeding speed and accuracy. When used to add liquids, the filter plate and hourglass device are not required; the downstream speed of the droplets can be controlled solely by the plug.

[0004] Some electrode slurries contain small amounts of metal particles in their raw materials. While existing slurry stirring and feeding systems, including those described in the aforementioned patent, can precisely control the raw materials, they are unable to remove these metal particles, leading to the presence of impurities in the slurry. Therefore, how to remove these metal particles from the raw materials during the feeding process is a challenge facing those skilled in the art. Summary of the Invention

[0005] The object of the present invention is to provide an electrode slurry stirring and feeding system device and method to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: an electrode slurry stirring and feeding system device, comprising a tank body, on which a main material feeding mechanism, a liquid auxiliary material feeding mechanism and a solid auxiliary material feeding mechanism are provided; the bottoms of the main material feeding mechanism, the liquid auxiliary material feeding mechanism and the solid auxiliary material feeding mechanism are all equipped with feeding pipes connected to the interior of the tank body, and a speed limiting filtering mechanism and a material discharge control valve are installed on the feeding pipes.

[0007] The speed-limiting filtering mechanism comprises a circular ring, the edge of which is fixedly provided with a rotating shaft which rotates with the inner wall of the feed pipe, and a filter screen which is made of magnetic material is installed inside the circular ring.

[0008] As a preferred technical solution of the present invention, the longitudinal section of the circular ring is two symmetrical arc-shaped structures, and the filter screen is located in the middle of the two arc-shaped structures.

[0009] As an optimal technical solution of the present invention, the rotating shaft is provided with a gear located outside the feed pipe, and a torsion spring is connected between the gear and the feed pipe; a drive shaft parallel to the rotating shaft is rotatably installed outside the feed pipe, and an incomplete gear corresponding to the position of the gear is provided on the drive shaft.

[0010] As a preferred technical solution of the present invention, the feed pipe includes two fixed sections and a movable section located between the two fixed sections. The two fixed sections are connected by a rigid rod, and the speed limiting filter mechanism is located in the lower fixed section.

[0011] As a preferred technical solution of the present invention, an annular groove is provided on the inner wall of the upper fixed section, and the movable section is movably cooperated with the annular groove; a number of rigid hooks are evenly fixedly installed on the top surface of the movable section along the circumference, and a slot is provided on the top of the annular groove, and a hook made of rubber material is installed in the slot.

[0012] As a preferred technical solution of the present invention, the cross-section of the tank body is circular, a vertical main shaft is rotatably installed in the tank body, and two horizontal stirring arms are fixedly installed on the main shaft. There is a height difference between the two stirring arms and the upper and lower positions do not correspond.

[0013] The present invention also provides an electrode slurry stirring and feeding method, which is completed by using the above-mentioned electrode slurry stirring and feeding system device, and includes the following steps:

[0014] Step 1: Weigh and discharge the materials through an external weighing system, put the main material into the main material feeding mechanism, put the liquid auxiliary material into the liquid auxiliary material feeding mechanism, and put the solid auxiliary material into the solid auxiliary material feeding mechanism;

[0015] Step 2: The main material feeding mechanism, liquid auxiliary material feeding mechanism and solid auxiliary material feeding mechanism are opened simultaneously, and the main material, liquid auxiliary material and solid auxiliary material enter the tank body;

[0016] Step 3: Stir and disperse the main material, liquid auxiliary material and solid auxiliary material in the tank.

[0017] As a preferred technical solution of the present invention, in the second step, the feeding speed of the speed-limiting filtering mechanism is controlled by controlling the reciprocating swing speed of the rotating shaft; in the third step, the main shaft drives the stirring arm to rotate to stir and disperse the main material, liquid auxiliary material and solid auxiliary material.

[0018] In the above technical solution, the present invention provides an electrode slurry stirring and feeding system device, in which the filter screen of the speed-limiting filter mechanism is made of magnetic material. When the raw material passes through the filter screen, the filter screen will adsorb the metal particles in the raw material, thereby reducing the impurities in the slurry; and the filter screen can swing back and forth within a certain range. The faster the swinging speed, the faster the raw material descends, and the slower the swinging speed, the slower the raw material descends, thereby controlling the descending speed of the raw material. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0020] Figure 1 Schematic diagram of the structure of the electrode slurry stirring and feeding system in the embodiment;

[0021] Figure 2 This is a partial structural diagram of the feeding pipe in the embodiment;

[0022] Figure 3 Schematic diagram of the structure of the ring and the filter screen in the embodiment;

[0023] Figure 4 Schematic diagram of part of the internal structure of the feed pipe in the embodiment.

[0024] Description of reference numerals:

[0025] 1. Tank body; 2. Main material feeding mechanism; 3. Liquid auxiliary material feeding mechanism; 4. Solid auxiliary material feeding mechanism; 5. Feeding pipe; 501. Fixed section; 502. Movable section; 503. Annular groove; 504. Annular groove; 505. Slot; 506. Hook; 6. Speed limiting and filtering mechanism; 601. Ring; 602. Rotating shaft; 603. Filter screen; 604. Gear; 605. Drive shaft; 606. Incomplete gear; 7. Unloading control valve; 8. Main shaft; 9. Stirring arm. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0027] like Figure 1 As shown, this embodiment provides an electrode slurry stirring and feeding system device, including a tank body 1, on which a main material feeding mechanism 2, a liquid auxiliary material feeding mechanism 3, and a solid auxiliary material feeding mechanism 4 are provided; the main material feeding mechanism 2, the liquid auxiliary material feeding mechanism 3, and the solid auxiliary material feeding mechanism 4 are all installed with a feeding pipe 5 connected to the interior of the tank body 1 at the bottom, and a speed limiting filter mechanism 6 and a discharge control valve 7 are installed on the feeding pipe 5. When the discharge control valve 7 is closed, the main material feeding mechanism 2, the liquid auxiliary material feeding mechanism 3, and the solid auxiliary material feeding mechanism 4 stop discharging. When the discharge control valve 7 is opened, the main material feeding mechanism 2, the liquid auxiliary material feeding mechanism 3, and the solid auxiliary material feeding mechanism 4 continue discharging. The cross section of the tank body 1 is circular, and a vertical main shaft 8 is rotatably installed in the tank body 1. Two horizontal stirring arms 9 are fixedly installed on the main shaft 8. There is a height difference between the two stirring arms 9 and the upper and lower positions do not correspond.

[0028] like Figure 2 and Figure 3 As shown, the speed limiting filtering mechanism 6 includes a circular ring 601, on the edge of which is fixedly mounted a rotating shaft 602 which rotates with the inner wall of the feed pipe 5, and a filter screen 603 which is made of magnetic material is mounted inside the circular ring 601; the longitudinal section of the circular ring 601 is two symmetrical arc structures, and the filter screen 603 is located in the middle of the two arc structures; the rotating shaft 602 is provided with a gear 604 which is located outside the feed pipe 5, and a torsion spring is connected between the gear 604 and the feed pipe 5; a driving shaft 605 which is parallel to the rotating shaft 602 is rotatably mounted outside the feed pipe 5, and the driving shaft 605 is provided with an incomplete gear 606 which corresponds to the position of the gear 604.

[0029] Specifically, the raw materials falling from the feed pipe 5 are blocked when passing through the filter 603, and their descent speed is slowed down. The external power source drives the drive shaft 605 and the incomplete gear 606 to rotate continuously. The incomplete gear 606 intermittently contacts the gear 604. The combined action of the incomplete gear 606 and the torsion spring causes the gear 604, the rotating shaft 602, the ring 601, and the filter 603 to oscillate back and forth. The reciprocating oscillation of the filter 603 shakes the raw materials accumulated on it, causing the raw materials to fall. When the raw materials pass through the filter 603, the filter 603 absorbs the metal particles in the raw materials. The faster the external drive source drives the drive shaft 605 to rotate, the higher the frequency of the filter 603's oscillation, and the faster the raw materials fall, thereby achieving control of the material discharge speed through the external drive source. It should be noted that in this embodiment, the density of the filter 603 is relatively high, and the flow rate of the liquid auxiliary material when passing through the filter 603 is relatively slow. The higher the frequency of the filter 603's oscillation, the faster the liquid auxiliary material falls.

[0030] like Figure 2 and Figure 4 As shown, the feed pipe 5 includes two fixed sections 501 and a movable section 502 located between the two fixed sections 501. The two fixed sections 501 are connected by a rigid rod, and the speed limiting filtering mechanism 6 is located in the lower fixed section 501; an annular groove 503 is provided on the inner wall of the upper fixed section 501, and the movable section 502 is movably matched with the annular groove 503; a plurality of rigid hooks 504 are evenly fixedly installed on the top surface of the movable section 502 along the circumferential direction, a slot 505 is provided on the top of the annular groove 503, and a hook 506 made of rubber material is installed in the slot 505.

[0031] Specifically, after the stirring and dispersion of each tank is completed, the operator closes the discharge control valve 7, and then pushes the movable section 502 to rise, and cleans the metal particles adsorbed on the filter screen 603; in the process of the operator pushing the movable section 502 to rise, the movable section 502 enters the annular groove 503, the hook 504 is inserted into the slot 505, and after contacting the hook 506, it pushes the hook 506 to deform, and finally the hook 506 is restored, and the hook 504 is suspended, so that the movable section 502 is maintained at a predetermined height, so that the operator can clean the filter screen 603. After the cleaning is completed, the operator rotates the movable section 502 so that the hook 506 and the hook 504 are staggered and separated, and then releases the movable section 502, and the movable section 502 drops and resets, and the operator rotates the movable section 502 to reset it.

[0032] This embodiment also provides an electrode slurry stirring and feeding method, which is completed by using the above-mentioned electrode slurry stirring and feeding system device, and includes the following steps:

[0033] Step 1: Weigh and discharge the materials through an external weighing system, feed the main material into the main material feeding mechanism 2, feed the liquid auxiliary material into the liquid auxiliary material feeding mechanism 3, and feed the solid auxiliary material into the solid auxiliary material feeding mechanism 4;

[0034] Step 2: The main material feeding mechanism 2, the liquid auxiliary material feeding mechanism 3 and the solid auxiliary material feeding mechanism 4 are simultaneously opened to discharge the main material, liquid auxiliary material and solid auxiliary material into the tank body 1; the discharge speed of the speed-limiting filter mechanism 6 is controlled by controlling the reciprocating swing speed of the rotating shaft 602;

[0035] Step 3: The main shaft 8 drives the stirring arm 9 to rotate to stir and disperse the main material, liquid auxiliary material and solid auxiliary material.

[0036] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. An electrode slurry stirring and feeding system device, comprising a tank body (1), on which a main material feeding mechanism (2), a liquid auxiliary material feeding mechanism (3) and a solid auxiliary material feeding mechanism (4) are provided; characterized in that: The bottoms of the main material feeding mechanism (2), the liquid auxiliary material feeding mechanism (3) and the solid auxiliary material feeding mechanism (4) are all equipped with feeding pipes (5) communicating with the interior of the tank body (1), and the feeding pipes (5) are equipped with a speed-limiting filtering mechanism (6) and a material discharge control valve (7); The speed-limiting filtering mechanism (6) comprises a circular ring (601), a rotating shaft (602) fixedly mounted on the edge of the circular ring (601) and rotatably engaged with the inner wall of the feed pipe (5), and a filter screen (603) mounted inside the circular ring (601), the filter screen (603) being made of a magnetic material.

2. The electrode slurry stirring and feeding system according to claim 1, characterized in that: The longitudinal section of the circular ring (601) is two symmetrical arc-shaped structures, and the filter screen (603) is located in the middle of the two arc-shaped structures.

3. The electrode slurry stirring and feeding system according to claim 2, characterized in that: The rotating shaft (602) is sleeved with a gear (604) located outside the feeding pipe (5), and a torsion spring is connected between the gear (604) and the feeding pipe (5); a driving shaft (605) parallel to the rotating shaft (602) is rotatably mounted outside the feeding pipe (5), and an incomplete gear (606) corresponding to the position of the gear (604) is sleeved on the driving shaft (605).

4. The electrode slurry stirring and feeding system according to claim 3, characterized in that: The feed pipe (5) comprises two fixed sections (501) and a movable section (502) located between the two fixed sections (501). The two fixed sections (501) are connected by a rigid rod, and the speed-limiting filter mechanism (6) is located in the lower fixed section (501).

5. The electrode slurry stirring and feeding system according to claim 4, characterized in that: An annular groove (503) is provided on the inner wall of the upper fixed section (501), and the movable section (502) is movably matched with the annular groove (503); a plurality of rigid hooks (504) are evenly fixedly installed on the top surface of the movable section (502) along the circumferential direction; a slot (505) is provided on the top of the annular groove (503), and a hook (506) made of rubber material is installed in the slot (505).

6. The electrode slurry stirring and feeding system according to claim 5, characterized in that: The cross section of the tank body (1) is circular. A vertical main shaft (8) is rotatably mounted in the tank body (1). Two horizontal stirring arms (9) are fixedly mounted on the main shaft (8). The two stirring arms (9) have a height difference and their upper and lower positions do not correspond.

7. A method for stirring and feeding electrode slurry, which is accomplished by using the electrode slurry stirring and feeding system device according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: Weigh and discharge the materials through an external weighing system, feed the main material into the main material feeding mechanism (2), feed the liquid auxiliary material into the liquid auxiliary material feeding mechanism (3), and feed the solid auxiliary material into the solid auxiliary material feeding mechanism (4); Step 2: The main material feeding mechanism (2), the liquid auxiliary material feeding mechanism (3) and the solid auxiliary material feeding mechanism (4) are opened simultaneously to discharge the materials, and the main material, liquid auxiliary material and solid auxiliary material enter the tank body (1); Step 3: stirring and dispersing the main material, liquid auxiliary material and solid auxiliary material in the tank body (1).

8. The electrode slurry stirring and feeding method according to claim 7, characterized in that: In the second step, the feeding speed of the speed-limiting filtering mechanism (6) is controlled by controlling the reciprocating swing speed of the rotating shaft (602); in the third step, the main shaft (8) drives the stirring arm (9) to rotate to stir and disperse the main material, liquid auxiliary material and solid auxiliary material.

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