KR102307664B1 - Cleaning Device for Prismatic Battery Cell Having Roller Coated with Organic Solvent - Google Patents

Abstract

The present invention is an apparatus for cleaning a battery cell in which an electrode assembly including a positive electrode, a negative electrode, and a separator is embedded in a prismatic battery case, in a state in which a plurality of prismatic battery cells are loaded, one side perpendicular to the rotation axis of the cleaning rollers A transport member for sequentially moving the prismatic battery cells in the direction, a pair of cleaning rollers rotating in opposite directions with the prismatic battery cells interposed therebetween, cleaning one surface and the other surface of the prismatic battery cells in a pressurized state, respectively, and It provides a battery cell cleaning device, characterized in that it comprises a spraying portion for spraying the cleaning liquid to the cleaning surface of the cleaning roller at a position adjacent to the cleaning roller.

Description

Prismatic battery cell cleaning device including a roller coated with organic solvent {Cleaning Device for Prismatic Battery Cell Having Roller Coated with Organic Solvent}

The present invention relates to a cleaning apparatus for a prismatic battery cell including a roller coated with an organic solvent.

Recently, an increase in the price of an energy source due to the depletion of fossil fuels, interest in environmental pollution is amplified, and the demand for an eco-friendly alternative energy source is becoming an indispensable factor for future life. Accordingly, research on various power production technologies such as nuclear power, solar power, wind power, and tidal power continues, and power storage devices for using the generated energy more efficiently are also of great interest.

In particular, as technology development and demand for mobile devices increase, the demand for secondary batteries as an energy source is rapidly increasing, and accordingly, many studies on batteries capable of meeting various needs are being conducted.

In general, a secondary battery means a battery that can be charged and discharged, unlike a primary battery that cannot be charged, and is widely used in electronic devices such as mobile phones, camcorders, notebook computers, or electric vehicles. It has a capacity three times higher than that of a nickel-cadmium battery or a nickel-hydrogen battery, which is widely used, and has an excellent energy density per unit weight, so the degree of utilization is rapidly increasing.

Such a secondary battery can be divided into a lithium ion battery using a liquid electrolyte and a lithium ion polymer battery using a solid polymer electrolyte depending on the type of electrolyte, and depending on the shape of the battery case, the electrode assembly is a cylindrical or prismatic metal Cylindrical and prismatic batteries embedded in a can, and pouch-type batteries in which the electrode assembly is embedded in a pouch-type case made of an aluminum laminate sheet.

In addition, secondary batteries are classified according to the structure of an electrode assembly in which a positive electrode, a negative electrode, and a separator interposed between the positive and negative electrodes are stacked. A jelly-roll type (winding type) electrode assembly with a structure wound with a separator interposed therebetween, a stack type (stacked type) electrode assembly in which a plurality of positive and negative electrodes cut in units of a predetermined size are sequentially stacked with a separator interposed therebetween and the like. A stack/folding type electrode assembly having a structure in which unit cells in which positive and negative electrodes are stacked with a separator interposed therebetween are sequentially wound on a separation film has been developed.

Among them, the jelly-roll type electrode assembly is easy to manufacture, has the advantage of excellent energy density per weight, and in particular, is widely used because it is easily stored in a cylindrical secondary battery case.

FIG. 1 is a schematic diagram of a prismatic battery cell incorporating a conventional jelly-roll type electrode assembly.

Referring to FIG. 1 , the prismatic battery cell 10 has an electrode assembly 20 embedded in a prismatic metal battery case 30 , and a negative terminal 2 as a protruding terminal at the open top of the battery case 30 . ) has a structure in which the top cap 3 is formed in combination.

The negative electrode of the electrode assembly 20 is electrically connected to the lower end of the negative terminal 2 on the top cap 3 through the negative electrode tab 4 , and such negative terminal 2 is connected to the top cap by an insulating member 6 . Insulated from (3). On the other hand, the other electrode of the electrode assembly 20 is electrically connected to the top cap 3 whose positive electrode tab 5 is made of a conductive material such as aluminum and stainless steel, thereby forming a positive electrode terminal by itself.

In addition, in order to ensure the electrical insulation state of the electrode assembly 20 and the top cap 3 except for the electrode tabs 4 and 5, a sheet-shaped insulating member ( After inserting 7), the top cap 3 is mounted, and the top cap 3 and the battery case 30 are joined together by welding along the contact surface. Then, after injecting the electrolyte through the electrolyte injection port 8, a metal ball (not shown) is welded and sealed, and the battery is completed by coating the welding site with epoxy or the like.

In this case, in general, in order to manufacture the battery case of the prismatic battery cell, a plate-shaped base material made of aluminum or the like is processed to have a rectangular parallelepiped shape through a continuous drawing process. In order to perform this drawing process, drawing oil serving as a lubricant is applied so that the processing of the base material located in the press mold is smoothly performed. Since it can be a cause of occurrence, it is necessary to go through the process of cleaning the drawing oil.

In addition, even when the electrolyte is injected through the electrolyte inlet, the electrolyte is not impregnated into the battery cell and a part of the electrolyte may flow out of the battery case. These contaminants are fixed in the form of lithium salts, which cause sparks Since it acts as a factor threatening the safety of the battery, such as a starting point of ignition, a process of cleaning the outer surface of the battery cell is absolutely necessary.

The cleaning process of the battery cell is generally performed by spraying a high-temperature, high-pressure washer fluid of about 40 degrees to the battery cell loaded in the carrier.

However, since the above method uses a washer liquid including water as a main component as the cleaning liquid, not only does not exhibit sufficient cleaning power to remove residual contaminants, but also may cause swelling.

The swelling phenomenon occurs due to an increase in internal pressure by a gas generated by decomposing a part of the electrolyte during the charging process because a carbonate-based organic solvent is used as the electrolyte in the activation process of the battery cell, or during the charging process Among them, as lithium ions are inserted into the carbon, the thickness of the electrode plate itself increases.

Specifically, the temperature of the outer wall of the battery case made of a metal material with excellent thermal conductivity rises due to the injection of high-temperature washer fluid, and the temperature inside the battery rises due to conduction heat, so that a part of the electrolyte inside is decomposed to generate gas, A thickness difference from 100 μm to 250 μm occurs before and after cleaning.

This swelling phenomenon not only directly causes a decrease in battery capacity, but also becomes a potential factor that greatly impairs safety such as ignition or explosion. ) does not exist, there is no longer a method to remove the gas inside, so a technique for preventing the occurrence of a swelling phenomenon is particularly required.

In order to solve this problem, the prior art (JP4541684) sprays a cleaning agent to the battery can by a shower nozzle through a cleaning system having a cleaning storage tank, a cleaning unit, a drying unit and a transfer mechanism, and another prior art (KR0537606) ) tried to improve the effective cleaning ability and prevent swelling by spraying the cleaning solution toward the tray containing the battery can or by spraying water to the current collector material moving along the rollers.

However, the above technologies still use a high-temperature cleaning solution and directly spray it, so the swelling phenomenon cannot be effectively suppressed, and the thickness of the battery cell is not uniform, which in turn leads to a decrease in the battery capacity of the device. did. In addition, since the plurality of battery cells were cleaned while moving through the partially closed tray, there was a limitation in that cleaning was not complete, such as a large number of incomplete cleaning areas were found.

Accordingly, there is a very high need for the development of a battery cell cleaning device that effectively suppresses the occurrence of a swelling phenomenon, has a uniform thickness before and after the cleaning process, improves lifespan characteristics and safety, and exhibits excellent cleaning power.

An object of the present invention is to solve the problems of the prior art as described above and the technical problems that have been requested from the past.

After repeated in-depth research and various experiments, the inventors of the present application, as will be described later, a pair of cleaning rollers to which a cleaning solution is applied while pressing one and the other surface of the prismatic battery cell are cleaned, It was confirmed that the effect can be exhibited, and the present invention was completed.

Accordingly, the battery cell cleaning apparatus according to the present invention is an apparatus for cleaning a battery cell in which an electrode assembly including a positive electrode, a negative electrode and a separator is built in a prismatic battery case,

a transport member for sequentially moving the prismatic battery cells in a direction perpendicular to the rotation axis of the cleaning rollers in a state in which the plurality of prismatic battery cells are loaded;

a pair of cleaning rollers rotating in opposite directions with the prismatic battery cell interposed therebetween, cleaning one surface and the other surface of the prismatic battery cell in a pressurized state, respectively; and

a spraying unit for spraying a cleaning liquid onto the cleaning surface of the cleaning roller at a position adjacent to the cleaning roller;

It is characterized in that it includes.

As described above, in the case of the conventional prismatic battery cell cleaning device, a high temperature and high pressure washer liquid was directly sprayed onto the battery cell, and swelling occurred due to the high temperature cleaning liquid, and also water was used as the main component. Since the containing washer liquid was used, sufficient cleaning power was not exerted to remove contaminants.

Furthermore, since the prismatic battery cell was subjected to a cleaning process in a state in which a part of the surface in contact with the battery cell was loaded on a closed carrier, the washer liquid was not uniformly applied to the outer surface of the battery cell, so that the cleaning was incompletely performed.

On the other hand, the battery cell cleaning apparatus according to the present invention exhibits excellent cleaning power by using an organic solvent at room temperature as a cleaning solution, suppresses gas generation inside the battery cell, and reduces swelling as well as a pair of cleaning Since the cleaning solution is directly contacted with the battery cell while the battery cell is pressurized using a roller, not only the outer surface of the battery cell is evenly cleaned, but also the uniformity of the battery cell thickness before and after the process is further improved.

The transfer member for transferring the battery cells, in one specific example, may have a frame-type structure, and a groove for loading and fixing the battery cells may be formed on the inner surface of the transfer member, and a constant speed by the power unit to sequentially move the battery cells in one direction.

The spraying unit for spraying the cleaning liquid, in one specific example, may be fixed on the spraying unit holder or moved by a flow member to spray the cleaning liquid, and one or more spraying parts spray the cleaning liquid on the cleaning surface at a position adjacent to the cleaning roller can do.

The type of the organic solvent included in the cleaning solution is not particularly limited, but in order to effectively remove the remaining drawing oil or electrolyte contaminants in the form of lithium salts, the cleaning solution is, for example, dimethyl carbonate, dimethyl formamide, N -Methyl formamide, sulfolane (tetrahydrothiophene-1,1-dioxide), 3-methylsulfolane, N-butyl sulfone, dimethyl sulfoxide, pyrrolidinone (HEP), dimethylpiperidone (DMPD), N -Methyl pyrrolidinone (NMP), N-methyl acetamide, dimethyl acetamide (DMAc), dimethylformamide (DMF), diethylacetamide (DEAc), dipropylacetamide (DPAc), ethanol, propanol, butanol, It may include any one or more organic solvents of hexanol, ethylene glycol, tetrachloroethylene, propylene glycol, toluene, trpentine, methyl acetate, ethyl acetate, petroleum ether, acetone, cresol, and glycerol.

Among them, dimethyl carbonate (DMC), which is also used as a solvent for the electrolyte, is particularly preferable as a cleaning solution in that it has a low viscosity, is liquid at room temperature, and has excellent dissociation ability with lithium salts.

In one specific example, the organic solvent may be 50 to 80% by weight based on the total weight of the cleaning solution.

If the organic solvent is included in the cleaning solution in an amount of less than 50% by weight, the cleaning solution does not contain a sufficient amount of an organic solvent capable of effectively dissociating contaminants such as lithium salts, so it is undesirable to reduce the cleaning power, and vice versa. , when included in excess of 80% by weight, the content of components other than the organic solvent included in the cleaning solution, for example, glycol ether compounds or surfactants, is reduced, so that the effect of reducing the surface tension is insufficient or the rinsing power is reduced This decrease is not desirable.

In addition, the temperature of the washing liquid, in one specific example, may be preferably 15 ℃ to 35 ℃, more preferably 20 ℃ to 30 ℃, most preferably 24 ℃ to 26 ℃ can be have.

Specifically, the cleaning power is generally improved as the temperature increases, but in order to prevent the swelling phenomenon, it is required to wash the battery cells at the same temperature as the assembly and manufacturing environment, that is, in the range of room temperature, 24°C to 26°C. When the cleaning process is performed in a temperature range of

On the other hand, the material of the cleaning roller according to the present invention is not particularly limited, but in one specific example, polyacetate resin, rubber resin, nylon resin, polylactone resin, chitosan, collagen, cellulose, polyvinyl alcohol (PVA) , may be made of any one selected from the group consisting of fibrinogen, polysulfone, silicone and polyurethane.

Among them, polyurethane is more preferable that has strength to keep the thickness of the battery cells uniform, has elasticity that does not cause a change in the shape of the battery case itself, and allows the cleaning solution to be uniformly applied to the cleaning roller.

On the other hand, in the cleaning roller included in the cleaning apparatus according to the present invention, a plurality of pores capable of supporting the cleaning liquid may be formed on the cleaning surface, and the cleaning surface may be formed in an embossed structure.

In one specific example, the embossed structure may have a planar shape of any one of an elliptical shape, a semicircular shape, and a polygonal shape, and the pores or the embossed structure may be sequentially formed on the cleaning surface in a linear or matrix shape. can

The pores have the effect of improving the cleaning power by allowing the cleaning surface of the cleaning roller to hold more cleaning liquid, and in one specific example, the diameter of the pores may be 5 μm to 500 μm, and the embossed structure is A pair of cleaning rollers that pressurize the battery cell while rotating can more effectively press the battery cell, thereby minimizing the difference in the thickness of the battery cell.

On the other hand, the length of the cleaning surface of the cleaning roller according to the present invention, in one specific example, may be 80 to 120 mm.

If the length of the cleaning surface of the cleaning roller is less than 80 mm, it is not preferable because a part of the outer surface of the battery case does not contact the cleaning roller and the cleaning is incomplete. This is not desirable because it increases.

In particular, since the maximum width of the prismatic battery cell does not exceed 100 mm, the length of the cleaning surface is more preferably 95 to 105 mm.

The cleaning rollers, in one specific example, may press the prismatic battery cell at a pressure of 0.1 Mpa to 2 Mpa.

If the cleaning rollers pressurize the prismatic battery cell with a pressure of less than 0.1 Mpa, it is not preferable to pressurize the battery cell with a sufficient pressure, so that the thickness of the battery cell before and after the cleaning process is not uniform, and on the contrary, 2 Mpa When the pressure exceeds the pressure, it is not preferable because the shape of the battery case may be deformed.

On the other hand, the cleaning apparatus according to the present invention, in one specific example, includes a plurality of a pair of rollers, and among them, a pair of cleaning rollers through which the battery cell last passes has water as a cleaning liquid as a main component. Room temperature washer fluid may be applied.

Most of the cleaning liquid containing the organic solvent is removed during the drying process, but in order to completely remove the remaining cleaning liquid, a pair of cleaning rollers through which the battery cell last passes is a battery cell in a state in which a washer liquid containing water as a main component is applied. can be pressurized.

Meanwhile, the cleaning roller included in the cleaning apparatus according to the present invention may have a structure in which a reinforcing member having a predetermined width is formed along one surface of the cleaning surface parallel to the direction of the rotation axis of the roller in one specific example.

Specifically, since the prismatic battery cell has the highest strength at one end and the other end, in order to effectively press the one end and the other end of the battery cell, a reinforcing member having improved strength than the material constituting the cleaning roller is used on one side of the cleaning roller. It is possible to minimize the difference in the thickness of the battery cells before and after the cleaning process by forming them accordingly, and the reinforcing member may be formed continuously or discontinuously, and the type thereof is not particularly limited, but a reinforced polyurethane band having excellent strength and elasticity It is preferable to be

In this case, in one specific example, in the cleaning process of the cleaning roller, the reinforced polyurethane band starts contacting one end of the prismatic battery cell at the start of cleaning, and immediately before the end of cleaning, the reinforced polyurethane band may additionally be configured to contact the other end of the prismatic battery cell.

This is to design the circumference of the cleaning roller equal to the width of the prismatic battery cell, control the rotation speed and the rotation start time to be the same between the pair of cleaning rollers, and move one end of the prismatic battery cell moving by the transfer member. It can be realized by controlling the reinforcing member to come into contact with the cleaning surface of the cleaning roller on which it is formed.

Meanwhile, the cleaning apparatus according to the present invention may further include a power unit for rotating the cleaning roller and transporting the prismatic battery cells, and may further include a drying unit for drying the prismatic battery cells passing through the cleaning rollers. .

One or more air injection units for spraying air are built in the drying unit, and in the drying unit, the battery cells may be dried by air at room temperature injected from the air injection unit.

The present invention also provides a device including at least one prismatic battery cell manufactured by using the prismatic battery cell cleaning apparatus.

The device may be selected from a mobile phone, a tablet computer, a notebook computer, a power tool, an electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, or a power storage device, and the structure of the device and a method for manufacturing the same are known in the art. Since it is known, a detailed description thereof will be omitted herein.

For reference, the prismatic battery cell may be a lithium secondary battery, but is not limited thereto.

Such a lithium secondary battery is composed of a positive electrode, a negative electrode, a separator, and a lithium salt-containing non-aqueous electrolyte, and these are also known in the art, so a detailed description thereof will be omitted herein.

As described above, the battery cell cleaning device according to the present invention uses an organic solvent at room temperature as a cleaning solution to not only have excellent cleaning power, but also suppress the generation of gas inside the prismatic battery cell according to the cleaning device, thereby suppressing a swelling phenomenon. This is prevented, and there is an effect that the life characteristics are improved. In addition, by using a frame-type transfer member and cleaning the battery cell while pressing the battery cell with a cleaning roller, it is effective to provide a battery cell having very excellent uniformity of the battery cell thickness before and after cleaning and cleaning processes.

1 is a conventional jelly-roll-type electrode assembly is built-in a prismatic battery cell is a schematic view.
2 is a schematic view showing a process in which a cleaning solution is applied to the cleaning roller of the present invention.
3 is a schematic view showing that a pair of cleaning rollers of the present invention wash the prismatic battery cell in a pressurized state.
4 is a perspective view showing a series of cleaning processes of the present invention.
5 is a schematic diagram showing the configuration of the drying unit of the present invention.
6 is a schematic view showing that pores are formed in the cleaning roller of the present invention.
Fig. 7 is a schematic view showing that the cleaning roller of the present invention has an embossed structure.
Fig. 8 is a schematic view showing that pores and emboss structures are arranged in the cleaning roller of the present invention.
9 is a schematic view showing that a reinforcing member is formed on one surface of the cleaning roller of the present invention.
Fig. 10 is a schematic view showing that an embossed structure is formed on a reinforcing member formed on one surface of the cleaning roller of the present invention.
11 is a schematic diagram showing that the cleaning liquid sprayed from the spraying unit of the present invention is applied to the rotating cleaning roller.
12 is a schematic view showing that one side and the other end of the battery cell according to an embodiment of the present invention is in contact with the reinforcing member of the cleaning roller.
13 is a schematic view showing that one side and the other end of the upper and lower surfaces of the battery cell according to an embodiment of the present invention is in contact with the reinforcing member of the pair of cleaning rollers.

Hereinafter, description will be made with reference to Examples according to the present invention, but these are for easier understanding of the present invention, and the scope of the present invention is not limited thereto.

2 is a schematic diagram showing a process in which a cleaning solution is applied to the cleaning roller of the present invention. 4 is a perspective view showing a series of cleaning processes of the present invention.

2 to 4 together, the battery cell cleaning apparatus according to the present invention includes a transfer member 60 ( FIG. 5 ) that moves the prismatic battery cells 10 in one direction, and the prismatic battery cell 10 is interposed therebetween. A pair of cleaning rollers 100 for cleaning while rotating in opposite directions while pressing one surface and the other surface of the prismatic battery cell 10, and a cleaning roller 100 at a position adjacent to the cleaning roller 100 It includes a spraying unit 110 for spraying a cleaning solution on the cleaning surface, and a power unit 70 for rotating the cleaning roller 100 and transporting the prismatic battery cell 10, and the cleaning roller 100 It includes a drying unit 80 for drying the prismatic battery cells 10 passed through.

The spray unit 110 is fixed on the spray unit holder 120 and sprays the cleaning liquid 170 on the cleaning surface of the cleaning roller 100 .

5 is a schematic diagram showing the configuration of the drying unit of the present invention.

Referring to FIG. 5 , the prismatic battery cells 10 passing through the cleaning rollers 100 are sequentially moved to the drying unit 80 by the transfer member 60 , and the drying unit 80 has a plurality of air The spray unit 180 is installed, and air 190 at room temperature is sprayed on the upper and lower surfaces of the prismatic battery cell 10 to dry the prismatic battery cell 10 to which the cleaning liquid 170 is applied.

6 is a schematic diagram showing that pores are formed in the cleaning roller of the present invention, FIG. 7 is a schematic diagram showing that an embossing structure is formed in the cleaning roller of the present invention, and FIG. 8 is the present invention A schematic diagram showing that pores and emboss structures are arranged on the cleaning roller of

6 to 8 , in the cleaning roller 100 according to the present invention, pores 140 are formed to support more cleaning liquid 170, or to improve the uniformity of the battery cell thickness. A plurality of emboss 150 is formed for this purpose, and they are sequentially formed on the cleaning surface of the cleaning roller 100 in a linear or matrix type.

9 is a schematic diagram showing that a reinforcing member is formed on one surface of the cleaning roller of the present invention, and FIG. 10 shows that an embossed structure is formed on the reinforcing member formed on one surface of the cleaning roller of the present invention A schematic diagram is shown, and FIG. 11 is a schematic diagram showing that the cleaning liquid sprayed from the spraying unit of the present invention is applied to the rotating cleaning roller.

9 to 11 , the cleaning roller 100 of the present invention includes a reinforcing member 200 having a predetermined width along one surface of the cleaning surface parallel to the direction of the rotation axis of the cleaning roller 100, for example, For example, a reinforced polyurethane band is formed, and an emboss 150 is formed on the reinforcement member 200 to minimize the difference in thickness of the battery cell 10 , and the cleaning solution 170 is reinforced from the spray unit 100 . It is applied to the rotating cleaning roller 100 on which the member 200 is formed.

12 is a schematic view showing that one side and the other end of the battery cell according to an embodiment of the present invention is in contact with the reinforcing member of the cleaning roller is shown, Figure 13 is a battery cell according to an embodiment of the present invention A schematic diagram showing that one side and the other end of the upper and lower surfaces of the device are in contact with the reinforcing member of the pair of cleaning rollers is shown.

12 and 13 together, in the pair of cleaning rollers 100 according to the present invention, the reinforcing member 200 formed on a portion of the cleaning roller 100 at the start of cleaning during the cleaning process is provided. Initiating contact with one end 40 of the prismatic battery cell 10, and again just before the end of cleaning, the reinforcing member 200 additionally contacts the other end 50 of the prismatic battery cell 10, so that the strongest strength By pressing the one side and the other end of the prismatic battery cell 10 with the reinforcing member 200 having a stronger strength than the cleaning roller 100, more effectively the uniformity of the thickness before and after the cleaning process of the prismatic battery cell 10 try to

Although described above with reference to the drawings according to the embodiment of the present invention, those skilled in the art to which the present invention pertains will be able to make various applications and modifications within the scope of the present invention based on the above content.

Claims (16)

An apparatus for cleaning a battery cell in which an electrode assembly including a positive electrode, a negative electrode, and a separator is embedded in a prismatic battery case,
a transport member for sequentially moving the prismatic battery cells in a direction perpendicular to the rotation axis of the cleaning rollers in a state in which the plurality of prismatic battery cells are loaded;
A pair of cleaning rollers rotating in opposite directions with the prismatic battery cell interposed therebetween, cleaning one surface and the other surface of the prismatic battery cell in a pressurized state, respectively; and
and a spraying unit for spraying the cleaning liquid onto the cleaning surface of the cleaning roller at a position adjacent to the cleaning roller,
The cleaning rollers are battery cell cleaning apparatus, characterized in that for pressing the prismatic battery cell at a pressure of 0.1 Mpa to 2 Mpa. According to claim 1, wherein the cleaning solution is dimethyl carbonate, dimethyl formamide, N-methyl formamide, sulfolane (tetrahydrothiophene-1,1-dioxide), 3-methylsulfolane, N-butyl sulfone, dimethyl sulfoxide Side, pyrrolidinone (HEP), dimethylpiperidone (DMPD), N-methyl pyrrolidinone (NMP), N-methyl acetamide, dimethyl acetamide (DMAc), dimethylformamide (DMF), diethylacetamide (DEAc) in dipropylacetamide (DPAc), ethanol, propanol, butanol, hexanol, ethylene glycol, tetrachloroethylene, propylene glycol, toluene, trpentine, methyl acetate, ethyl acetate, petrol ether, acetone, cresol and glycerol Battery cell cleaning device, characterized in that it contains any one organic solvent. The battery cell cleaning apparatus according to claim 2, wherein the organic solvent is dimethyl carbonate (DMC). According to claim 2, wherein the organic solvent is a battery cell cleaning device, characterized in that 50 to 80% by weight based on the total weight of the cleaning solution. According to claim 1, wherein the temperature of the cleaning solution is a battery cell cleaning device, characterized in that the room temperature of 20 to 30 ℃. The material of claim 1, wherein the cleaning roller is made of polyacetate resin, rubber resin, nylon resin, polylactone resin, chitosan, collagen, cellulose, polyvinyl alcohol (PVA), fibrinogen, polysulfone, silicone and polyurethane. Battery cell cleaning device, characterized in that it consists of any one selected from the group. The battery cell cleaning apparatus according to claim 6, wherein the cleaning roller is made of polyurethane. The battery cell cleaning apparatus according to claim 1, wherein the cleaning roller has a plurality of pores capable of supporting a cleaning solution on the cleaning surface, or the cleaning surface is formed in an embossed structure. The battery cell cleaning apparatus according to claim 8, wherein the embossed structure has any one of a planar shape of an elliptical shape, a semicircular shape, and a polygonal shape. The battery cell cleaning apparatus according to claim 8, wherein the pores or the embossed structure are sequentially formed on the cleaning surface in a linear or matrix type. The battery cell cleaning apparatus according to claim 1, wherein the cleaning surface of the cleaning roller has a length of 80 to 120 mm. delete The battery cell cleaning apparatus according to claim 1, wherein the cleaning roller has a reinforced polyurethane band having a predetermined width along one surface of the cleaning surface in parallel to the direction of the rotation axis of the roller. The method according to claim 13, wherein in the cleaning process of the cleaning roller, the reinforced polyurethane band starts contacting one end of the prismatic battery cell at the start of cleaning, and immediately before the end of cleaning, the reinforced polyurethane band is additionally attached to the prismatic battery cell Battery cell cleaning device, characterized in that in contact with the other end of the. The battery cell cleaning apparatus according to claim 1, further comprising a power unit for rotating the cleaning roller and transferring the prismatic battery cell. The battery cell cleaning apparatus according to claim 1, further comprising a drying unit for drying the prismatic battery cells that have passed through the cleaning rollers.

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