System for removing metal foreign matters in electrode material

Abstract

The utility model discloses a system for removing metal foreign matters in an electrode material. The system for removing the metal foreign matter in the electrode material comprises a machine frame, a conveying belt, a hopper and a microwave processing box, the conveying belt, the hopper and the microwave processing box are all arranged on the machine frame, the hopper is arranged at the input end of the conveying belt, and the microwave processing box is arranged in the middle of the conveying belt. According to the characteristic that the metal foreign matter can selectively absorb microwaves with certain wavelengths, the metal foreign matter in the electrode material is removed through the microwaves, the method is higher in efficiency, and the metal foreign matter can be removed more thoroughly.

Description

Technical Field

[0001] The utility model relates to the technical field of electrode material impurity removal, in particular to a system for removing metal foreign matter from electrode materials. Background Art

[0002] During the production process of batteries, metal impurities will be mixed in. These metal impurities will be oxidized at the positive electrode of the battery and then reduced at the negative electrode of the battery. As the reaction proceeds, the metal impurities at the negative electrode of the battery accumulate to form large metal particles, which will cause perforation of the diaphragm, short circuit the battery, cause thermal runaway, and then catch fire and explode; small metal particles will cause crystallization, affect the formation of the SEI film, and affect the battery cycle performance. Currently, metal foreign matter is removed by screening and high magnetic field strength adsorption. These two methods have the following defects: First, screening can only remove large metal particles, but not small metal particles; second, high magnetic field strength adsorption can only remove magnetic substances, and some non-magnetic substances cannot be removed from the electrode material by demagnetization equipment.

[0003] In view of this, the present utility model is proposed. Utility Model Content

[0004] The purpose of the utility model is to overcome the defects of the prior art and provide a system for removing metal foreign matter in electrode materials.

[0005] The utility model solves the technical problem by adopting the following technical scheme.

[0006] The utility model provides a system for removing metal foreign matter in electrode materials, comprising a frame 1, a conveyor belt 2, a hopper 3 and a microwave processing box 7, wherein: the conveyor belt 2, the hopper 3 and the microwave processing box 7 are all arranged on the frame 1, the hopper 3 is arranged at the input end of the conveyor belt 2, and the microwave processing box 7 is arranged at the middle position of the conveyor belt 2.

[0007] The utility model has the following beneficial effects:

[0008] The utility model provides a system for removing metal foreign matter in electrode materials. According to the characteristic that metal foreign matter selectively absorbs microwaves of a certain wavelength, microwaves are used to remove metal foreign matter in electrode materials. This method is more efficient and can remove metal foreign matter more thoroughly. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0010] Figure 1 It is a schematic diagram of a system for removing metal foreign matter from electrode materials of the utility model;

[0011] Figure 2 This is a schematic diagram of the cutaway structure of the box body of the utility model when viewed from above;

[0012] Figure 3 This is a flow chart of a method for removing metallic foreign matter from electrode materials of the utility model;

[0013] Figure 4 It is a curve chart of 1C charge cycle capacity retention rate of 811 high nickel ternary cathode material before and after microwave demagnetization;

[0014] Figure 5 This is a comparison of the size of large metal particles of 811 high-nickel ternary cathode material before and after microwave demagnetization;

[0015] Figure 6 This is the temperature field simulation result diagram of experimental group 1;

[0016] Figure 7 This is the temperature distribution diagram on the diagonal line of the box in experimental group 1;

[0017] Figure 8 This is the statistical test result of the number of particles in experimental group 1 before and after microwave demagnetization.

[0018] Figure numbers: 1. Frame; 2. Conveyor belt; 3. Hopper; 4. Electric valve; 5. Box; 6. Flattening device; 7. Microwave treatment box; 8. Air intake duct; 9. Microwave generator; 10. Infrared thermometer; 11. Linear module. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be described clearly and completely below. If the specific conditions are not specified in the embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer of the reagents or instruments used is not specified, they are all conventional products that can be purchased commercially.

[0020] The utility model aims to provide a system for removing metal foreign matter in electrode materials, so as to solve the problem that the metal foreign matter in electrode materials cannot be effectively removed by screening and high magnetic field strength adsorption methods.

[0021] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0022] An embodiment of the utility model provides a system for removing metal foreign matter in electrode materials, comprising a frame 1, a conveyor belt 2, a hopper 3 and a microwave processing box 7, wherein: the conveyor belt 2, the hopper 3 and the microwave processing box 7 are all arranged on the frame 1, the hopper 3 is arranged at the input end of the conveyor belt 2, and the microwave processing box 7 is arranged at the middle position of the conveyor belt 2.

[0023] In an optional embodiment, it also includes: a flattening device 6, which is arranged above the conveyor belt 2 and fixedly connected to the frame 1, and the flattening device 6 is located between the hopper 3 and the microwave processing box 7. The flattening device 6 is set to control the thickness of the material to 6-8mm and the material width to 50cm.

[0024] In an optional embodiment, the microwave processing box 7 is composed of a plurality of boxes 5 connected in series, each box 5 is 1 m long, and the boxes 5 are made of absorbing materials.

[0025] In an optional embodiment, four microwave generators 9 are evenly distributed on the top of each box 5, a linear module 11 is fixedly connected to the inner wall of the box 5, and the microwave generators 9 are installed on the linear module 11, and the positions of the microwave generators 9 are adjusted by the linear module 11.

[0026] In an optional embodiment, the microwave generator 9 is set at a horizontal distance of 40 cm to 60 cm.

[0027] In an optional embodiment, an air intake pipe 8 is connected and fixed on the box body 5, and an input end of the air intake pipe 8 is connected to a gas supply device, which provides protective gas.

[0028] In an optional embodiment, it further includes: an infrared thermometer 10, which is arranged at the output end of the microwave processing box 7 and fixedly connected to the rack 1.

[0029] In an optional embodiment, the conveyor belt 2 has a width of 300 to 800 mm, the conveyor belt 2 is made of high temperature resistant material, and a protective cover is installed on the conveyor belt 2 .

[0030] In an optional embodiment, the hopper 3 is conical in shape, and the volume of the hopper 3 is 300-1000L.

[0031] In an optional embodiment, an output end of the hopper 3 is fixedly connected to an electric valve 4 .

[0032] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0033] A system for removing metallic foreign matter from electrode materials, see Figure 1 and Figure 2 , including a frame 1, a conveyor belt 2, a hopper 3 and a microwave treatment box 7, the conveyor belt 2, the hopper 3 and the microwave treatment box 7 are all arranged on the frame 1, the hopper 3 is arranged at the input end of the conveyor belt 2, the microwave treatment box 7 is arranged in the middle of the conveyor belt 2, and a protective cover is installed on the conveyor belt 2; the width of the conveyor belt 2 is 300-800mm, the conveyor belt 2 is made of high temperature resistant material, an adjustable thickness flattening device 6 is arranged above the conveyor belt 2, and the flattening device 6 is arranged at a position between the hopper 3 and the microwave treatment box 7, and the flattening device 6 is fixedly connected to the frame 1; the shape of the hopper 3 is conical, and the volume of the hopper 3 is 300~1000L, the output end of the hopper 3 is fixedly connected to an electric valve 4; the microwave processing box 7 is composed of multiple box bodies 5 connected in series, the length of the box body 5 is 1m, and the box body 5 is made of absorbing material; an air intake pipe 8 is connected and fixed on the box body 5, four microwave generators 9 are evenly distributed on the top of the box body 5, a linear module 11 is fixedly connected to the inner wall of the box body 5, and the microwave generator 9 is installed on the linear module 11, an infrared thermometer 10 is provided at the output end of the microwave processing box 7, and the infrared thermometer 10 is fixedly connected to the frame 1; the input end of the air intake pipe 8 is connected to a gas supply device, and the gas supply device provides protective gas.

[0034] For a method of removing metallic foreign matter from electrode materials using the above-mentioned removal system, see Figure 3 , including the following steps: step 1, constructing an impurity removal system; step 2, setting parameters; step 3, adding materials; step 4, microwave treatment; step 5, discharging materials;

[0035] In the above step 2, the horizontal distance of the microwave generator 9 is set to 40cm~60cm, the power of the microwave generator 9 is set to 3kW~6kW, the flattening device 6 is set to control the thickness of the material to 6~8mm, the material width is 50cm, and the material conveying speed of the conveyor belt 2 is set to 0.09~0.15m / s.

[0036] In the above step three, the electric valve 4 is started to transport the material in the hopper 3 to the conveyor belt 2.

[0037] In the above step four, the material is transported to the flattening device 6 via the conveyor belt 2, and the flattened material is transported to the microwave processing box 7 via the conveyor belt 2 for microwave treatment. During the material treatment process in the microwave processing box 7, the air supply device transports protective gas into the box body 5 through the air inlet pipe 8 to achieve atmosphere protection for the material.

[0038] In the above step 5, the material treated in the microwave treatment box 7 is measured by the infrared thermometer 10 and then transported to the cooling section through the conveyor belt 2 for cooling.

[0039] According to the above method, taking 811 high nickel ternary positive electrode material as the material to be demagnetized, under six groups of different parameter conditions, the maximum tolerance temperature of the material and the corresponding comparison results before and after demagnetization are shown in the following table:

[0040]

[0041]

[0042] Combining the above table Figure 5 It can be seen that the horizontal distance between microwave generators, power, material thickness, and movement speed will affect the microwave demagnetization effect. The demagnetization process of experimental groups 1-3 can control the material temperature at around 200°C to prevent the material from being denatured at high temperature, thereby reducing the number of metal particles in the material. The metal particles are reduced from 85pcs / kg before demagnetization to 28pcs / kg, 29pcs / kg, and 27pcs / kg after demagnetization, effectively reducing the total number of ternary positive electrode material particles while reducing the size of metal particles. However, in comparison groups 1-3, the demagnetization process was changed, and the demagnetization effect became worse, and the demagnetization effect was not obvious.

[0043] The microwave demagnetization equipment and parameter combination of the utility model are used to perform microwave demagnetization on 811 high-nickel ternary positive electrode materials, and the 1C buckle power cycle capacity retention rate is detected. Figure 4 It can be seen that microwave demagnetization has basically no effect on the 1C cycle retention rate of the selected 811 high-nickel ternary positive electrode material before and after.

[0044] Figure 6 This is the result of temperature field simulation using ANSYS. Figure 7 for Figure 6 In the temperature curve of the 50cm*50cm square diagonal, the width of the conveyor belt for demagnetizing materials is 50cm. The simulation results are in good agreement with the actual temperature measurement results.

[0045] Figure 8 This is the combined t-test result of the number of metal particles of 811 high-nickel ternary positive electrode material before and after microwave demagnetization in experimental group 1. The results show that after demagnetization using the microwave demagnetization equipment and method of the utility model, the mean number of metal particles has a significant difference (p < 0.05), the equal variance test p = 0.9957 > 0.05, there is no significant difference in variance, and the demagnetization effect is obvious.

[0046] In summary, the utility model provides a system for removing metal foreign matter in electrode materials, and a method for removing metal foreign matter in electrode materials using the above-mentioned removal system, including: the material is fed by a hopper 3, the electric valve 4 controls the speed of the material discharge, the material is transported by a conveyor belt 2, the thickness and width of the material are controlled by a material flattening device 6, the microwave treatment box 7 generates microwave treatment raw materials through a microwave generator 9, the position of the microwave generator 9 can be adjusted by a linear module 11, the discharge temperature is monitored online by an infrared thermometer 10, and the protective gas is introduced through an air intake pipe 8 to provide atmosphere protection for the raw materials during the microwave treatment process. Compared with the existing method for removing metal foreign matter in ternary positive electrode materials, the utility model uses microwaves to remove metal foreign matter in ternary positive electrode materials based on the characteristic that metal foreign matter has selective absorption of microwaves of a certain wavelength. This method is more efficient and can remove metal foreign matter more thoroughly.

[0047] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A system for removing metallic foreign matter from electrode materials, characterized in that: The invention comprises a frame (1), a conveyor belt (2), a hopper (3) and a microwave processing box (7), wherein the conveyor belt (2), the hopper (3) and the microwave processing box (7) are all arranged on the frame (1), the hopper (3) is arranged at the input end of the conveyor belt (2), and the microwave processing box (7) is arranged at the middle position of the conveyor belt (2); The machine also comprises: a flattening device (6), the flattening device (6) being arranged above the conveyor belt (2) and fixedly connected to the frame (1), the flattening device (6) being located between the hopper (3) and the microwave treatment box (7), and the flattening device (6) being arranged to control the material thickness to be 6 to 8 mm and the material width to be 50 cm; The microwave treatment box (7) is composed of a plurality of boxes (5) connected in series, each box (5) is 1 m long, and the boxes (5) are made of microwave absorbing materials; Four microwave generators (9) are evenly distributed on the top of each box (5); a linear module (11) is fixedly connected to the inner wall of the box (5), and the microwave generator (9) is installed on the linear module (11); the position of the microwave generator (9) is adjusted by the linear module (11); The horizontal distance of the microwave generator (9) is set to be 40 cm to 60 cm.

2. The system for removing metallic foreign matter from electrode materials according to claim 1, characterized in that: An air intake pipe (8) is connected and fixed on the box body (5), and an input end of the air intake pipe (8) is connected to a gas supply device, which provides protective gas.

3. The system for removing metallic foreign matter from electrode materials according to claim 1, characterized in that: Also includes: An infrared thermometer (10) is arranged at the output end of the microwave processing box (7), and the infrared thermometer (10) is fixedly connected to the frame (1).

4. The system for removing metallic foreign matter from electrode materials according to claim 1, characterized in that: The width of the conveyor belt (2) is 300 to 800 mm, the conveyor belt (2) is made of high temperature resistant material, and a protective cover is installed on the conveyor belt (2).

5. The system for removing metallic foreign matter from electrode materials according to claim 1, characterized in that: The hopper (3) is conical in shape and has a capacity of 300 to 1000 L.

6. The system for removing metallic foreign matter from electrode materials according to claim 5, characterized in that: The output end of the hopper (3) is fixedly connected with an electric valve (4).

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