KR101266859B1 - Apparatus for grinding and distributing and Method for recovering valuable metals from used battery pack using the same - Google Patents

Abstract

The present invention relates to a grinding and classifying apparatus and a method for recovering valuable metals from a waste battery pack using the same. Grinding and classifying apparatus according to the present invention and the grinding body to form a grinding space; Located in the grinding space and the grinding unit for grinding the positive electrode structure; A classification body forming a classification space; A classification unit located in the classification space and classifying pulverized material; It characterized in that it comprises a vibration unit for vibrating the classifier.

Description

Apparatus for grinding and distributing and Method for recovering valuable metals from used battery pack using the same}

The present invention relates to a grinding and classifying apparatus and a method for recovering valuable metals from a waste battery pack using the same.

Recently, the use of a battery pack including a plurality of unit battery cells is increasing. The battery pack includes a plurality of battery modules electrically connected to each other, and the battery module includes a plurality of battery cells electrically connected to each other.

Such battery packs are widely used in electric vehicles (EVs) or hybrid electric vehicles (HEVs) requiring large electric capacity.

EV to HEV is in the spotlight as a means to solve the climate change problem caused by the greenhouse effect, which is a global environmental problem, and the number of production is expected to increase rapidly.

The battery cells used in EV to HEV use a lot of lithium-ion batteries, in which LiNi _x Co _y Mn _z O ₂ form is used as a positive electrode active material.

However, waste battery packs generated by electric vehicles are also expected to increase rapidly in the future, but there is no method for recovering valuable metals from them. In addition, in the recovery of valuable metals, crushing and classification should be performed, and there are no devices and methods for efficiently performing them.

It is an object of the present invention to provide a grinding and classification apparatus and a method for recovering valuable metals from a waste battery pack using the same.

An object of the present invention is a device for crushing and classifying the positive electrode structure recovered from the waste battery, comprising: a pulverizing body for forming a pulverizing space; Located in the grinding space and the grinding unit for grinding the positive electrode structure; A classification body forming a classification space; A classification unit located in the classification space and classifying pulverized material; It is achieved by a device comprising a vibrator for vibrating the classifier.

The anode structure, the aluminum foil; It may include a cathode active material which is fixed to the aluminum foil.

The grinding unit may include at least two grinding blades spaced apart in the vertical direction.

The classifier may include at least two classifiers spaced apart in the vertical direction and having different mesh sizes.

The smallest mesh size among the classifiers may be 65 mesh.

Located in the upper and lower portions of each classifier may further include a classification drain communicating the classification space and the outside.

The pulverized product may further include a pulverized product supply unit for supplying the pulverized body from the pulverized body to the classification body.

The pulverized product supply unit, the suction transfer unit for sucking the pulverized material in the pulverized space; It may include a transfer control unit for adjusting the amount of the pulverized material supplied in the classification space.

An object of the present invention is a method for recovering valuable metals from a waste battery pack, the waste battery pack includes a plurality of battery modules electrically connected, the battery module includes a plurality of battery cells electrically connected, Disassembling the waste battery pack to obtain a battery cell; Discharging the battery cell; Pulverizing and classifying at least an anode structure of the battery cells to recover valuable metals, wherein the pulverizing body forms a grinding space in the grinding and classification; Located in the grinding space and the grinding unit for grinding the positive electrode structure; A classification body forming a classification space; A classification unit located in the classification space and classifying pulverized material; It is achieved by a method of using a milling and classifying device comprising a vibrating unit which vibrates the classifying unit.

The grinding unit may include at least two grinding blades spaced apart in the vertical direction.

The classifier may include at least two classifiers spaced apart in the vertical direction and having different mesh sizes.

The pulverizing and classifying apparatus may further include a classifying drain positioned above and below each classifying body and communicating with the powder space.

The pulverization and classification apparatus may further include a pulverized material supply unit for supplying a pulverized product from the pulverized main body to the classification main body.

The pulverized product supply unit, the suction transfer unit for sucking the pulverized material in the pulverized space; It may include a transfer control unit for adjusting the amount of the pulverized material supplied in the classification space.

The discharge may be performed in a discharge solution, and after the discharge, may further include dehydrating and drying the battery cell.

The obtaining of the battery cell may include removing an electrical connection between the battery modules; And removing the circuit board and the frame from the battery module.

After the discharge, the method may further include separating the battery cell into a cathode structure, an anode structure, and a separator.

The anode structure, the aluminum foil; It may include a cathode active material which is fixed to the aluminum foil.

The pulverization and classification, the cathode active material may be recovered to 80% or more, aluminum may be recovered to 6% or less.

An object of the present invention is a method for recovering a valuable metal from a hybrid vehicle battery pack comprising a plurality of lithium ion battery type battery cells using LiNi _x Co _y Mn _z O ₂ as a cathode active material, the waste battery pack is And a plurality of battery modules electrically connected to each other, wherein the battery module includes a plurality of battery cells electrically connected to each other, and manually separating the battery modules from the waste battery pack. Manually separating the battery cells from the battery module; Discharging the battery cell; Manually separating the battery cell into a positive electrode structure, a negative electrode structure and a separator including the positive electrode active material; Pulverizing and classifying the anode structure to recover valuable metals, and the pulverizing body forming a pulverizing space in the pulverizing and classifying; Located in the grinding space and the grinding unit for grinding the positive electrode structure; A classification body forming a classification space; A classification unit located in the classification space and classifying pulverized material; It achieves by the method of using the grinding | pulverization and classification apparatus containing the vibration part which vibrates the said classification body.

The grinding unit may include a pair of grinding blades spaced apart in the vertical direction, and the classification unit may include at least two or more classification bodies which are spaced apart in the vertical direction and have different mesh sizes.

An object of the present invention is a method for recovering valuable metals from a waste battery pack, the waste battery pack includes a plurality of battery modules electrically connected, the battery module includes a plurality of battery cells electrically connected, Disassembling the waste battery pack to obtain a battery cell; Discharging the battery cell; Separating the positive electrode structure from the battery cell; Pulverizing the anode structure using at least two grinding blades spaced in the vertical direction to obtain a pulverized product; The pulverized product is achieved by a method comprising classifying by vibration of at least two classifiers spaced in the vertical direction and having different mesh sizes.

The anode structure, the aluminum foil; The positive electrode active material is fixed to the aluminum foil, and the grinding and classification, the positive electrode active material may be recovered to 80% or more, aluminum may be recovered to 6% or less.

According to the present invention, an efficient grinding and classification apparatus and a valuable metal recovery method are provided.

1 to 4 is a view showing a grinding and classifying apparatus according to the present invention,
5 is a process chart showing a valuable metal recovery method according to the present invention,
6 shows a state of separating the battery module from the waste battery pack,
Figure 7 illustrates the electrical connection of the battery module in the waste battery pack,
8 shows a state in which a battery cell is separated from a battery module,
9 illustrates a battery cell separated from a battery module,
10 shows the voltage change in the discharge process of the battery cell when the discharge solution is not replenished,
11 shows the voltage change during the discharging process of the battery cell when replenishing the discharging solution,
12 shows a drying rate when the discharged battery cells are dried after being dehydrated.
Figure 13 shows the drying rate when the discharged battery cells are dried without dehydration,
14 shows discharged and dried battery cells,
15 is a view showing a positive electrode structure separated from the discharged and dried battery cells,
16 is a view showing the weight content for each particle size according to the grinding conditions,
17 is a view showing the concentration of valuable metals and impurities by particle size after the first grinding,
18 is a view showing the concentration of valuable metals and impurities by particle size after the second milling,
19 is a view showing the concentration of valuable metals and impurities by particle size after the third milling,
20 is a view showing the concentration of valuable metals and impurities by particle size after over-crushing.

The waste battery pack referred to in the present invention may be obtained from a battery pack for an electric vehicle, especially a hybrid vehicle (HEV), but is not limited thereto. In addition, the pulverizing and classifying apparatus of the present invention can be used for crushing and classifying the anode structure obtained from a waste battery other than an electric vehicle or a hybrid vehicle, and may be used to crush and classify the cathode structure and / or the separator together with the anode structure.

1 to 4, the grinding and classification apparatus according to the present invention will be described.

The grinding and classifying apparatus includes a grinding body 10, a grinding unit 20, a grinding material supply unit 30, a classification body 40, a classification unit 50 and a vibrating unit 60.

The grinding body 10 is cylindrical and forms an internal grinding space. 1, which shows the pulverized body 10, a suction part for moving the pulverized material, a configuration for supplying power, and a movable pulverized powder loading part are also shown.

The pulverization unit 20 is located in the pulverization space, and pulverizes the object injected into the pulverization space. The grinding unit 20 is composed of a pair of grinding blades 21 and 22 spaced apart vertically. Since the positive electrode structure has a large area, there may be a region in which grinding is not performed depending on the state of loading in the grinding space, so that the grinding blades 21 and 22 are provided in two upper and lower stages.

The grinding blades 21 and 22 are made of stainless steel, and may rotate at 2000 to 10000 rpm. If necessary, the grinding blades 21 and 22 may be provided in three or more stages.

The cathode active material, which is the main recovery target in the anode structure, is attached to the aluminum foil, and the cathode active material is separated from the aluminum foil during the grinding process. In the grinding process, aluminum is also crushed, but may be separated from the classification unit 50 after the particle size is larger than the cathode active material.

The pulverized product supply unit 30 supplies the pulverized product pulverized in the pulverized unit 20 to the classification main body 40. The pulverized material supply unit 30 includes a suction transfer unit 31 for sucking the pulverized material in the pulverized space and a transfer control unit 32 for controlling the supply amount of the sucked pulverized material.

The suction transfer unit 31 is provided as a cyclone using an air compressor, and transfers the pulverized product by using the air suction generated in the process of compressing the air in the air compressor. The feed control unit 32 is provided with a rotary valve, and is closed in the suction process so that the pulverized material can be sucked and opened after suctioning the pulverized material to supply the pulverized product to the classification body 40 through natural dropping. Although not shown, the grinding material suction and supply may be controlled through a control unit that controls the cyclone and the rotary valve. Suction and feeding can be adjusted according to the milling and grading capacity. When the pulverized product is manually supplied, the whole or a part of the pulverized product supply unit 30 may not be provided.

The classification body 40 forms a classification space and is cylindrical.

The classification unit 50 is located in the classification space to separate the pulverized products according to the particle size. The classifier 50 includes two classifiers 51 and 52 spaced apart in the vertical direction. 4 also shows a frame for supporting the classifiers 51 and 52. The classifiers 51 and 52 have different mesh sizes so that the upper classifier 51 has a larger mesh size, that is, the mesh of the lower classifier 52 is denser. If necessary, three or more classifiers 51 and 52 may be provided.

The classified pulverized product is drained to the outside through the classification drains 41, 42, and 43. When the upper classifier 51 is 40 mesh and the lower classifier 52 is 65 mesh, relatively large particles of +40 mesh are drained from the upper classification drain 41, and the intermediate classification drain 42 ), -40 mesh to +65 mesh medium-sized particles are drained, and in the lower classification drain 43, -65 mesh fine particles are drained.

The vibrator 60 vibrates the classifying body 40 itself, thereby classifying the pulverized product while vibrating the classifier 50.

A method of recovering valuable metals from a waste battery pack using a pulverizing / classifying apparatus will be described with reference to FIG. 5.

Hereinafter, a battery cell of a waste battery pack will be described using a lithium ion battery type as an example, but the present invention is not limited thereto.

The waste battery pack includes a plurality of battery modules electrically connected, and the battery module includes a plurality of battery cells electrically connected. The battery cell is located in an aluminum case and includes a positive electrode structure, a separator, an electrolyte, and a negative electrode structure.

First separate the waste battery pack into a battery module (S100). This process checks the voltage of the battery pack and removes the electrical connections between the battery modules. Also remove the screws that connect between the battery modules. This can be done manually.

Next, the battery module is separated into battery cells (S200). The battery module includes a circuit board, a frame and a battery cell, and the circuit board and the frame are recycled separately. This can also be done manually.

Next, the battery cells are discharged for work stability (S300). After the discharge is completed, the subsequent valuable metal recovery process can be safely performed in the atmosphere rather than in an inert atmosphere. The discharge can be made in the discharge solution. Distilled water may be used as the discharge solution. The completion of the discharge can be confirmed by decreasing the voltage over time.

After that, the discharged battery cells are dehydrated and dried (S400). Drying may be at 60 ° C to 90 ° C. The battery cell recovered after the discharge is directly put into the drying process or the drying time is reduced when the dehydration process, the drying time may be 10 hours to 30 hours. The battery cell may be in an aluminum case, which may be removed before discharging.

Meanwhile, the electrolyte in the battery cell is mostly removed during the discharge process, and some of the remaining electrolyte is also volatilized and removed during the drying process.

Next, the positive electrode structure is separated from the battery cell (S500). Each battery cell consists of a positive electrode structure, a separator, and a negative electrode structure, which are separated by hand. The anode structure is composed of an aluminum foil and a cathode active material fixed thereto. The cathode active material may be LiNi _x Co _y Mn _z O ₂ . The separator may be made of polyethylene or polypropylene. The negative electrode structure may be made of copper foil and graphite fixed thereto. Valuable metals to be recovered here are metals comprising a cathode material (Cu), a cathode material (Al), and a cathode active material (Li, Ni, Mn, Co). And the obtained cathode active material is transferred to a process for further processing.

The obtained anode structure is then crushed and classified, this process consists of a crushing and classifying device provided according to the present invention (S600).

Grinding and classification are preferably such that the desired valuable metals are recovered by 80% or more, and the unwanted metals by 6% or less. In the case of making a positive electrode active material from the recovered valuable metal, the unwanted metal may be aluminum. Even if it is pulverized, the particle size of the components constituting the positive electrode active material is usually smaller than that of the crushed aluminum foil, so that the separation particle size can be reduced to lower the aluminum content. The separation condition may be 65 mesh or less. For this purpose, a 65 mesh classifier is used as the lower classifier 52.

In another recovery method according to the present invention, the cathode structure is crushed and classified together with the anode structure. At this time, the active material of the negative electrode structure may be removed by a discharge process, etc., the separator may also be removed. This method can be used when the battery cell is in the form of an anode structure / cathode structure / anode structure or in the form of a cathode structure / anode structure / anode structure.

The recovered valuable metals may be recycled as raw materials of the cathode active material through the removal of impurities through acid leaching and lithium carbonate, or the sulfuric acid solution of the valuable metals may be obtained.

[Example]

Hereinafter, the present invention will be described in more detail with reference to valuable metal recovery. The examples are intended to illustrate the present invention in more detail, and it will be apparent to those skilled in the art that the scope of the present invention is not limited to the examples.

The waste battery pack used in the experiment was used for a golf cart and consists of six unit battery modules, each of which consists of ten battery cells.

1. Disconnect with battery module

6 is a photograph of separating the battery module into a waste battery pack. The battery module has a two-layer structure, and three battery modules are located on each floor. The battery modules of the upper layer and the lower layer are connected in series, respectively, and the battery modules of the upper layer and the lower layer are also connected in parallel.

In order to reliably disassemble each battery module from the battery pack, the voltage of the battery pack was checked, and the connected wires were cut one by one without cutting at a time.

The battery modules in the waste battery pack are connected as shown in FIG. 7, and the disassembly was performed in the order of disassembling the connection bar of the serial part, and then disassembling the connection bar of the parallel part. The battery module was removed from the battery pack.

The above work was performed by hand.

2. Disconnect into battery cell

The upper and lower parts of the disassembled battery module are divided into acrylic plates and substrates. When the cell is disassembled, the cells are stacked in layers so that the contacts of the upper and lower cells should not be joined to prevent short circuits. .

Each battery cell is fixed with double-sided tape to prevent separation between the frame and the frame between the cell and the cell to fix the cell. Therefore, the frame is removed first, and then each contact is cut with insulating scissors. To dismantle each battery cell.

8 shows a separation operation using insulating scissors. 9 shows an isolated battery cell. In FIG. 9 the battery cell is wrapped in an aluminum case.

3. Discharge

The battery cell from which the aluminum case was removed was put in distilled water and discharged.

10 and 11 show voltage changes during discharge. FIG. 10 illustrates a case in which the discharge solution is not replenished, and FIG. 11 illustrates a case in which the discharge solution is replenished.

It was confirmed that there was no significant difference in the voltage change when the discharge solution was not replenished and when replenished. The behavior of the voltage change was found to be the highest when the response was the lowest in 5 minutes, and both discharge reactions were completed within 70 minutes.

After discharging, the sample was dissolved using aqua regia (HCl: HNO ₃ = 3: 1) for the component analysis of the separated and recovered battery cells, and then analyzed by ICP analysis.

Analysis result of chemical composition of discharged unit battery cell (%) Co Mn Ni Li Al Cu Fe One 4.9 11.9 12.5 2.3 7.2 13.0 0.04 2 4.9 12.0 12.1 2.2 7.2 12.7 0.04 3 5.0 11.7 12.3 2.2 7.1 12.8 0.04 4 4.7 11.1 11.4 2.1 6.8 12.2 0.04 5 5.7 13.2 13.4 2.5 8.1 14.5 0.04 Ave. 5.1 12.0 12.3 2.3 7.3 13.1 0.04

Expected Proportion of Cathode Active Material LiNi _x Mn _y Co _z O ₂ Li Ni Mn Co Atomic weight 6.94 58.70 54.94 58.93 content (%) 2.26 12.34 11.97 5.05 Mole ratio 0.33 0.21 0.22 0.09 ratio One 0.6 0.7 0.3

As can be seen in Table 1 and Table 2 it was confirmed that the valuable metal in the sample consists of Co, Mn, Ni, Li, Al, Cu, and also contained a trace amount of Fe. The content of each element was found to be 5.1% Co, 12% Mn, 12.3% Ni, 2.3% Li, 7.3% Al, 13.1% Cu. The molar ratio of Li: Ni: Mn: Co of LiNi _x Mn _y Co _z O _{2 as} a positive electrode active material was 1: 0.6: 0.7: 0.3.

4. Dehydration and Drying

The battery cells were dried at 80 ° C. after discharge. 12 and 13 show the drying efficiency according to the drying time. 12 is a case of drying after dehydration using a dehydrator, Figure 13 is a case of drying without dehydration.

As shown in FIG. 12, when the sample was dehydrated, the sample had almost no change in weight after 10 hours, and thus the sample was dried. On the other hand, if you do not dehydrate as shown in Figure 13, it was confirmed that the drying is finished as the drying weight is constant after about 24 hours.

5. Separation of anode structure

14 is a view illustrating a battery cell in which discharge and drying are completed. By manual operation, the battery cells were separated into a positive electrode structure, a separator, and a negative electrode structure. 15 shows a separated anode structure.

In the negative electrode structure, graphite as the negative electrode active material was easily separated from the copper foil as the negative electrode. Therefore, the cathode structure is expected to be immediately recycled by the company that manufactures them. The separator is also ready for recycling.

On the other hand, in the anode structure, separation of the anode aluminum foil and the cathode active material is not observed. Therefore, additional work is required to recover valuable metals from the anode structure.

6. Crushing and Classifying

Next, pulverization and classification were performed using a pulverization and classification apparatus according to the present invention for the anode structure.

In the experiment, the grinding unit 20 used a pair of grinding blades 21 and 22 spaced up and down, and the rotational speed was 5000 rpm. The classifier 50 used four classifiers of 8 mesh, 18 mesh, 40 mesh and 65 mesh.

The grinding experiment was divided into four stages and the grinding characteristics were examined while adding samples for each grinding count. In the first pulverization, 5.6 kg of sample was added to the pulverizer, and then pulverized for 6 minutes. After pulverization, a certain amount of samples were taken to determine the pulverization efficiency. In the second milling, 7.9kg of sample was added to the first milling product, followed by 6 minutes of grinding. Likewise, the milling product was taken to determine the grinding efficiency. The grinding efficiency was analyzed. In the fourth milling (hypermilling), the change in metal recovery due to the milling was investigated through additional milling of three minutes without additional sample addition.

Table 3 shows the weight and the grinding time of the anode structure injected into the grinding body (10).

Input weight and grinding time 1st grinding Secondary grinding Tertiary grinding Hypercrushing Input weight (kg) 5.6 7.9 13.8 0 Grinding time (min) 6 6 9 3

Table 4 and Figure 16 shows the weight content for each particle size according to the grinding conditions.

Content by weight after classification (% by weight) Granularity 1st grinding Secondary grinding Tertiary grinding Hypercrushing +8 2.89 7.22 0.06 0.00 -8 + 18 12.14 13.81 12.05 6.94 -18 + 40 9.58 8.48 11.21 13.85 -40 + 65 2.34 2.71 2.42 2.88 -65 71.61 67.36 73.72 75.51 Loss 1.44 0.42 0.53 0.82 Total 100.00 100.00 100.00 100.00

  In Table 4 and FIG. 16, the + 8mesh product showed a tendency to decrease as the number of milling cycles increased. However, it was confirmed that similar grinding behaviors were observed regardless of the number of milling cycles. With the over grinding, the + 8mesh product could be completely crushed and the content of -8 + 18mesh product could be reduced by about half.

Tables 5 to 8 below show the concentration rates of valuable metals and impurities (aluminum) in primary, secondary, tertiary, and hyperpulverization, respectively, and FIGS. 17 to 20 are graphs of Tables 5 to 8, respectively. will be.

Concentration of valuable metals and impurities by particle size after first grinding mesh Co Li Ni Mn Al +8 2.99 3.36 2.98 2.98 6.84 -8 + 18 8.33 9.45 8.40 8.42 42.65 -18 + 40 5.29 6.37 5.54 5.66 40.42 -40 + 65 1.71 1.82 1.73 1.73 3.26 -65 81.67 79.00 81.35 81.21 6.83 total 100.00 100.00 100.00 100.00 100.00

Concentration of Valuable Metals and Impurities by Particle Size after Secondary Crushing (Weight%) mesh Co Li Ni Mn Al +8 6.28 7.57 6.35 6.40 11.29 -8 + 18 10.32 10.46 10.44 10.31 45.52 -18 + 40 5.33 5.37 4.98 5.02 32.78 -40 + 65 2.19 2.27 2.20 2.21 3.53 -65 75.87 74.32 76.03 76.06 6.87 total 100.00 100.00 100.00 100.00 100.00

Concentration of Valuable Metals and Impurities by Grain Size after 3rd Grinding (Weight%) mesh Co Li Ni Mn Al +8 0.05 0.00 0.04 0.03 0.04 -8 + 18 9.14 8.98 9.19 9.34 44.42 -18 + 40 7.15 7.59 6.80 7.03 43.46 -40 + 65 1.69 1.88 1.69 1.73 4.67 -65 81.98 81.54 82.27 81.87 7.40 total 100.00 100.00 100.00 100.00 100.00

Concentration of Valuable Metals and Impurities by Particle Size after Overgrinding (Weight%) mesh Co Li Ni Mn Al +8 0.00 0.00 0.00 0.00 0.00 -8 + 18 5.58 5.90 5.69 5.62 27.45 -18 + 40 11.22 10.76 11.75 11.94 60.88 -40 + 65 2.63 2.42 2.46 2.50 6.29 -65 80.56 80.92 80.11 79.94 5.38 total 100.00 100.00 100.00 100.00 100.00

In the above results, all of the four grinding conditions showed that -65 mesh product was concentrated about 80% of the elements Co, Li, Ni, and Mn contained in the positive electrode active material. It can be seen that the concentration (and therefore Al removal rate is about 95%). In the actual process application, the grinding and classification conditions may be adjusted such that the recovery rate of Co, Li, Ni, Mn contained in the cathode active material is 80% or more and Al is 6% or less.

From the above, it was confirmed that the use of the pulverization and classification apparatus according to the present invention can obtain pulverization and classification maintaining a constant efficiency.

While the present invention has been particularly shown and described with reference to specific embodiments thereof, those skilled in the art will appreciate that such specific embodiments are merely preferred embodiments and that the scope of the present invention is not limited thereby. something to do. Accordingly, the actual scope of the present invention will be defined by the appended claims and their equivalents.

10: grinding body 20: grinding unit
21, 22: grinding blade 30: grinding powder supply unit
31: suction transfer unit 32: transfer control unit
40: classification body 41, 42, 43: classification drain
50: classifier 51, 52: classifier
60: vibration part

Claims (23)

delete delete delete delete delete delete delete delete In the method of recovering valuable metals from waste battery packs generated in electric vehicles,
The waste battery pack includes a plurality of battery modules electrically connected, the battery module includes a plurality of battery cells electrically connected,
Disassembling the waste battery pack to obtain a battery cell;
Discharging the battery cell;
Separating the battery cell into a positive electrode structure, a negative electrode structure and a separator;
Crushing and classifying the positive electrode structure to recover valuable metals;
The grinding and classification
A grinding body for forming a grinding space;
Located in the grinding space and the grinding unit for grinding the positive electrode structure;
A classification body forming a classification space;
A classification unit located in the classification space and classifying pulverized material;
Using a grinding and classifying device including a vibrating unit for vibrating the classifier,
The anode structure is an aluminum foil; It includes a cathode active material fixed to the aluminum foil,
The grinding unit comprises at least two grinding blades spaced apart in the vertical direction. delete The method of claim 9,
The classification unit,
And at least two classifiers spaced apart in the vertical direction and having different mesh sizes. 12. The method of claim 11,
The grinding and classifying apparatus,
And a classification drain positioned above and below each of the classifiers and communicating with the powder space. The method of claim 12,
The grinding and classifying apparatus,
And a pulverized product supply unit for supplying a pulverized product from the pulverized body to the classification body. In claim 13,
The pulverized product supply unit,
A suction conveying unit for sucking the pulverized matter in the pulverizing space;
And a transfer control unit for controlling the amount of the pulverized material supplied into the classification space. 10. The method of claim 9,
The discharge is made in the discharge solution,
After the discharge, further comprising dehydrating and drying the battery cell. 16. The method of claim 15,
Obtaining the battery cell,
Removing the electrical connection between the battery modules;
Removing the circuit board and the frame from the battery module. delete delete 10. The method of claim 9,
The grinding and classification,
Cathode active material is recovered more than 80%, aluminum is carried out to recover less than 6%. delete delete delete delete

Images