KR20170088034A - Device for Manufacturing Battery Cell of Enhancing Electrolyte Wetting through Physical Stimulation - Google Patents

Abstract

The present invention relates to a device for improving the wetting of an electrolyte in an electrode assembly inside a battery cell. The present invention provides an electrolyte wetting device for manufacturing a battery cell, which includes: a battery cell tray with a downwardly indented shape with an upper side which is opened based on the ground to receive one or more battery cells; and a stimulus applying unit which is in contact with one side of the battery cell tray in a facing manner and applies a physical stimulus to the battery cell received in the battery cell tray.

Description

TECHNICAL FIELD [0001] The present invention relates to an electrolyte impregnating device for manufacturing a battery cell using physical stimulation for improving impregnation,

The present invention relates to an electrolytic solution impregnating apparatus for manufacturing a battery cell using physical stimulation for improving impregnation.

In recent years, the demand for environmentally friendly alternative energy sources has become an indispensable factor for the future, as the increase in the price of energy sources due to depletion of fossil fuels and the interest in environmental pollution are amplified. Various researches on power generation technologies such as nuclear power, solar power, wind power, and tidal power have been continuing, and electric power storage devices for more efficient use of such generated energy have also been attracting much attention.

Particularly, as technology development and demand for mobile devices are increasing, the demand for batteries as energy sources is rapidly increasing, and accordingly, a lot of researches on batteries that can meet various demands have been conducted.

Typically, in terms of the shape of a battery, there is a high demand for a prismatic secondary battery and a pouch-type secondary battery which can be applied to products such as mobile phones with a small thickness, and has advantages such as high energy density, discharge voltage, There is a high demand for lithium secondary batteries such as lithium ion batteries and lithium ion polymer batteries.

The secondary battery includes a cylindrical battery and a prismatic battery in which the electrode assembly is housed in a cylindrical or rectangular metal can according to the shape of the battery case, and a pouch type battery in which the electrode assembly is housed in a pouch-shaped case of an aluminum laminate sheet .

In particular, in recent years, a pouch-shaped battery having a structure in which a stacked or stacked / folded electrode assembly is embedded in a pouch-shaped battery case of an aluminum laminate sheet has attracted much attention due to low manufacturing cost, small weight, And its usage is gradually increasing.

Generally, such a secondary battery is manufactured by sealing an electrode assembly having a structure including a cathode, a cathode, and a separator interposed between the anode and the cathode, together with an electrolytic solution, in a state where the electrode assembly is embedded in the battery case.

In this case, the secondary battery is subjected to an aging process under a specific temperature, pressure, and time conditions so as to improve the impregnation of the electrolyte solution into the electrode assembly, and the degassing process (degas) process.

However, the aging process takes too much time to allow the electrode assembly to be sufficiently impregnated with the electrolytic solution, thereby increasing the overall time and cost required for manufacturing the secondary battery.

In addition, since the aging process is performed only in a state where the electrode assembly and the electrolyte are sealed together in the battery case, the impregnation of the electrolyte may be different according to each part of the electrode assembly, and in some cases, There is a problem that can occur.

In order to solve the above problems, after the degassing process of the secondary battery, an additional aging process is performed to improve the impregnation of the electrode assembly with the electrolyte. However, this may delay the overall process of the secondary battery, There is a problem in that it takes time and cost to increase.

Therefore, there is a high need for a technique capable of fundamentally solving such problems.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art and the technical problems required from the past.

The inventors of the present application have conducted intensive research and various experiments. As described later, the inventors of the present application have found that the application of a physical stimulus to a battery cell which is in contact with one side of the battery cell tray and faces the battery cell tray is stimulated It is possible to increase the direct physical contact between the electrode assembly and the electrolyte due to the physical stimulation and improve the impregnation of the electrolyte solution thereby improving the performance of the battery cell and further performing the aging process or the electrolyte impregnation process Therefore, it has been confirmed that the time and cost required for manufacturing the battery cell can be saved, and the present invention has been accomplished.

According to an aspect of the present invention, there is provided an electrolyte-impregnating apparatus for manufacturing a battery cell,

An apparatus for improving wetting of an electrolyte solution in an electrode assembly in a battery cell,

A battery cell tray having a shape in which at least one battery cell is housed, the cell cell tray having a top surface opened in a downward direction with respect to the ground; And

A magnetic pole applying unit which is in contact with one side of the battery cell tray and faces the battery cell tray and applies a physical magnetic pole to the battery cell tray;

As shown in FIG.

Therefore, the direct physical contact between the electrode assembly and the electrolyte increases due to the physical stimulation applied to the battery cell from the stimulus applying unit, thereby enhancing the impregnation of the electrolyte, thereby improving the performance of the battery cell, And the electrolytic solution impregnation step are not necessary, so that the time and cost required for manufacturing the battery cell can be saved.

In one specific example, the battery cell may have a structure in which an electrode assembly including a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode is embedded in a battery case together with an electrolyte solution.

In other words, the structure and the kind of the battery cell that can be manufactured through the electrolyte impregnation device according to the present invention are not limited to a great extent, and an electrode assembly including a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode The battery pack can be easily applied to a battery cell having a structure in which an electrolyte solution is directly contacted with the electrode assembly.

In the meantime, if the physical impulse from the stimulus application unit is effectively transferred to the battery cell, the electrolyte impregnation apparatus for producing a battery cell is not limited to a method or structure of the physical stimulus, The applying unit may be fixed to the bottom surface of the battery cell tray and may be configured to apply a physical stimulus by rotation.

More specifically, the magnetic pole applying unit may have a plate-like structure and may be configured to rotate in a fixed state facing the lower surface of the battery cell tray.

Therefore, due to the rotation of the magnetic pole applying unit having the plate-like structure, the battery cell tray fixed in a state facing the magnetic pole applying unit also rotates in a stable fixed state, The impregnation of the electrolyte solution into the electrode assembly in the battery cell can be improved.

In this case, the stimulus applying unit may be a structure that applies a physical stimulus by rotating in a planar direction clockwise or counterclockwise.

That is, the magnetic pole applying unit may be a structure that improves impregnation of the electrolyte by applying a centrifugal force generated by the rotation to the battery cell by rotating only in one direction in a plane.

However, the direction of rotation of the magnetic pole applying unit is not limited thereto. Specifically, the magnetic pole applying unit may be a structure that applies a physical magnetic pole by alternately repeating clockwise and counterclockwise planar rotation to be.

In this case, the physical stimulus applied by the stimulus applying unit is appropriately adjusted by adjusting the number or angle of rotation of the stimulus applying unit in one direction, either clockwise or counterclockwise, on the plane, so that the centrifugal force In addition, it may be a structure applied in the form of repetitive vibrations.

More specifically, the magnetic pole applying portion is rotated 100 times in a clockwise direction in a plan view, then rotated 100 times in a counterclockwise direction, and then is rotated 100 times in a clockwise direction, and the centrifugal force generated by the repetitive alternate rotation Lt; RTI ID = 0.0 > physical stimulation. ≪ / RTI >

In addition, the magnetic pole applying unit may be rotated in a counterclockwise direction by 60 degrees, then rotated clockwise by 60 degrees, after rotating the magnetic pole applying unit in a clockwise direction less than once, for example, Lt; RTI ID = 0.0 > a < / RTI >

Therefore, the magnetic pole applying unit can apply the physical stimulation that occurs in various directions in comparison with the centrifugal force generated in one direction, so that the impregnation of the electrolytic solution along each part of the electrode assembly can be more uniform.

If the impregnation of the electrolyte solution with respect to the electrode assembly can be stably improved, the rate of rotation of the stimulating unit is not limited. In detail, the stimulating unit may be rotated at a speed of 2,000 rpm to 4,000 rpm Lt; / RTI >

If the magnetic pole applying unit rotates at a speed of less than 2,000 rpm, the rotation speed of the magnetic pole applying unit is excessively slow, so that centrifugal force may not be generated enough to improve the impregnation of the electrolyte solution into the electrode assembly, On the contrary, when the magnetic pole applying unit rotates at a speed exceeding 4,000 rpm, the rotating speed of the magnetic pole applying unit becomes excessively large and the centrifugal force generated thereby may become too large. As a result, Can be locally different depending on each part of the electrode assembly.

The battery cells accommodated in the battery cell trays may be located at a central portion of the battery cell tray or may be arranged in a direction facing each other with two or more battery cells facing the inner peripheral surface of the battery cell tray. have.

More specifically, when the battery cells housed in the battery cell trays are located at the central portion of the battery cell tray, compared with the case where the battery cells are adjacent to one side of the battery cell tray, The difference in the physical stimulus applied to the electrode assembly in the battery cell may be relatively small or small so that electrolyte solution impregnation along each part of the electrode assembly in the battery cell can be more uniform.

Further, as compared with the case where the battery cells are located adjacent to one side of the battery cell tray, the rotation radius of the battery cells is relatively reduced, so that the centrifugal force applied to the battery cells by the rotation of the magnetic pole applying unit also decreases relatively Therefore, the stress applied to the rotation axis of the stimulus applying portion is reduced, and damage to the stimulus applying portion can be prevented.

On the other hand, when two or more battery cells housed in the battery cell tray are not located at the central portion of the battery cell tray, the battery cells are arranged in a direction opposite to the inner peripheral surface of the battery cell tray Lt; / RTI >

In this case, since the rotation radius of the battery cells is relatively large as compared with the case where the battery cells are located at the center of the battery cell tray, the centrifugal force applied to the battery cells by the rotation of the magnetic pole applying unit also increases Accordingly, the time required for impregnating the electrolyte solution into the electrode assembly in the battery cells can be further shortened.

The two or more battery cells are arranged in a direction facing each other in a state of facing the inner peripheral surface of the battery cell tray so that the battery cells are separated from the battery cell tray by the centrifugal force generated by the rotation of the magnetic pole applying unit And it is possible to prevent damage to the magnetic pole applying portion by eliminating the unevenness of the stress applied to the rotating shaft of the magnetic pole applying portion.

In this case, if the battery cell tray is a structure capable of effectively preventing the detachment of the battery cell mounted on the battery cell tray due to the centrifugal force generated by the rotation of the magnetic pole applying unit, and stably holding the battery cell, The battery cell tray is provided with a plurality of battery cells having different structures to minimize the difference in the physical stimulus applied by the rotation of the stimulus applying unit at each position and to easily accommodate the battery cells of various structures, And may be circular or rectangular in plan view.

The battery cell tray may include a partition for partitioning the battery cell tray so as to set the respective battery cell mounting positions for the two or more battery cells.

Accordingly, the battery cells housed in the battery cell tray can be stably housed by the partition walls.

At this time, the height of the partition wall may be 50% to 90% of the height of the battery cell, so as to maintain a stable storage state of the battery cells accommodated in the battery cell tray.

If the height of the barrier ribs is less than 50% of the height of the battery cells stored in the battery cell trays, the barrier ribs may not stably hold the battery cells. On the contrary, if the height of the barrier ribs is greater than 90% based on the height of the battery cells housed in the battery cell trays, after the process of impregnating the electrolyte solution into the electrode assemblies is completed, It may be difficult to remove the battery cell from the battery cell.

Meanwhile, as described above, if the electrolyte impregnating apparatus for producing a battery cell is structured such that the physical stimulus from the stimulus applying unit can be effectively transmitted to the battery cells, the method and structure of the physical stimulation are not limited to a great extent, In another specific example, the physical stimulation may be a structure applied by ultrasonic waves generated in a stimulus application portion.

Generally, ultrasonic waves can apply a regular vibration to the battery cell due to inherent high frequency, thereby making it easier to increase the contact between the electrode assembly and the electrolyte in the battery cell, Impregnation of the electrolytic solution can be improved.

In particular, the ultrasonic waves may have a frequency of 20 kHz to 100 kHz and an amplitude of 2 to 30 탆.

If the frequency and the amplitude of the ultrasonic wave are lower than the above range, the desired effect of improving electrolyte impregnation can not be exhibited. If the frequency and the amplitude are higher than the above range, the efficiency of the manufacturing process is decreased, There is a problem that can be deteriorated.

The ultrasonic waves may be applied once or twice or more periodically or aperiodically.

Here, the number and frequency of application of the ultrasonic waves from the stimulus applying unit may be appropriately selected according to conditions such as the quantity and size of the battery cells to which the ultrasonic waves are applied.

In one specific example, the battery cell may be a structure that is housed in a battery cell tray and is carried on a liquid medium.

More specifically, the liquid medium is a medium for transferring ultrasonic physical stimuli applied from a magnetic pole applying unit to the battery cells, and is configured to bear the battery cells accommodated in the battery cell tray, The space can be kept filled.

Accordingly, the ultrasonic waves applied from the stimulus applying unit can be more effectively transmitted to the battery cell while minimizing the loss, and are uniformly transmitted to all the parts of the battery cell. Thus, It is possible to effectively prevent problems such as damage or short-circuiting of the battery cell, which may be caused by concentration of ultrasonic waves in a specific region such as the endoscope.

In order to maximize the above effect, the battery cell may have a structure in which at least 50% or more of the battery cells are supported on the liquid medium based on the outer surface area.

If the battery cell has less than 50% of the outer surface area of the battery cell carried on the liquid medium, the effect of ultrasonic wave transmission by the liquid medium may be deteriorated and the desired effect may not be exhibited.

In this case, the type of the liquid medium is not limited as long as it can effectively transmit the vibration generated by the ultrasonic wave from the stimulus application part to the battery cells accommodated in the battery cell tray. In detail, Water, and the like.

In this case, the battery cell tray may not include a separate partition so as to maximize the effect of transmitting ultrasonic waves by the liquid medium, unlike the case where the stimulus applying unit applies physical stimulation by rotation .

In other words, when the physical stimulation is applied by the ultrasonic wave generated in the stimulus application portion, the structure of the battery cell tray can be relatively simplified since the battery cell tray does not need to include a separate partition wall. Accordingly, it is possible to reduce the cost and time required for manufacturing the electrolyte-impregnating device for manufacturing a battery cell. When the stimulus applying unit applies a physical stimulus by rotation, the battery cell accommodated in the battery cell tray, The electrolyte impregnation process can be further simplified since it is not necessary to be carried in a separate medium for more effectively transmitting the physical stimulus.

According to another aspect of the present invention, there is provided a method for impregnating an electrode assembly with an electrolytic solution using the electrolytic solution impregnating apparatus for producing a battery cell,

i) receiving the battery cell through an open upper surface of the battery cell tray;

ii) applying a physical stimulus to the battery cell by operating a stimulus applying unit in a state where the battery cell is housed in the battery cell tray; And

iii) separating the battery cell to which the physical stimulation is applied from the battery cell tray;

. ≪ / RTI >

In this case, the magnetic pole applying section is fixed to the lower surface of the battery cell tray so that a physical stimulus can be applied by rotation.

However, the method of applying the physical stimulus is not limited thereto. Specifically, the physical stimulus may be a structure applied by ultrasonic waves generated in the stimulus application portion.

That is, the physical stimulation can be applied by the rotation of the stimulus applying unit or by the ultrasonic wave generated from the stimulus applying unit, thereby effectively enhancing the impregnation of the electrolyte solution into the electrode assembly in the battery cell.

The present invention also provides a battery cell manufactured using the electrolyte impregnating device for battery cell production and a battery pack including at least one battery cell, wherein the battery cell or the battery pack is known in the art , And a detailed description thereof will be omitted herein.

As described above, the electrolyte-impregnating apparatus for manufacturing a battery cell according to the present invention is configured to include a magnetic pole applying unit which is in contact with one side of a battery cell tray and is in contact with a battery cell accommodated in the battery cell tray, Thus, it is possible to increase the direct physical contact between the electrode assembly and the electrolyte due to the physical stimulation, thereby improving the impregnation of the electrolyte solution, thereby improving the performance of the battery cell and eliminating the need for an additional aging step or electrolyte impregnation step. The time and cost required for manufacturing the cell can be saved.

1 is a schematic view schematically showing the structure of an electrolyte solution impregnating apparatus for manufacturing a battery cell according to an embodiment of the present invention;
FIG. 2 is a schematic view showing a front structure and a plan structure of the battery cell tray of FIG. 1; FIG.
3 is a schematic view schematically showing the structure of a battery cell tray of an electrolyte solution impregnating apparatus for manufacturing a battery cell according to another embodiment of the present invention;
4 is a schematic view schematically showing the structure of an electrolyte solution impregnating apparatus for manufacturing a battery cell according to another embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the drawings according to the embodiments of the present invention, but the scope of the present invention is not limited thereto.

FIG. 1 is a schematic view schematically showing the structure of an electrolyte solution impregnating apparatus for manufacturing a battery cell according to an embodiment of the present invention. FIG. 2 is a schematic view schematically showing a front structure and a planar structure of the battery cell tray of FIG. Are shown.

Referring to FIGS. 1 and 2 together, the electrolyte infiltrating apparatus 100 for manufacturing a battery cell includes a battery cell tray 110 and a magnetic pole applying unit 120.

The stimulus applying unit 120 has a planar and circular structure and is a plate-like structure fixed on the lower surface of the battery cell tray 110. The lower surface of the stimulus applying unit 120 is provided with a magnetic pole applying unit 120 are connected to a rotary shaft 121 for rotating the rotary shaft.

The stimulus applying unit 120 rotates in a counterclockwise direction (R1) in a planar manner, so that a physical stimulus in the form of a centrifugal force generated thereby can be applied to the battery cells stored in the battery cell tray 110.

Here, the stimulus applying unit 120 may rotate in a clockwise direction on a plane, or may alternatively apply a physical stimulus by alternately repeating clockwise and counterclockwise rotation. The direction of rotation of the stimulus- Rotation method and the like can be appropriately selected in consideration of factors such as the size of the battery cell housed in the battery cell tray 110 and the size of the electrolyte infiltration device 100.

The battery cell tray 110 is formed in a circular shape in a planar shape and has a shape in which the upper surface opposed to the position of the magnetic pole applying unit 120 is opened downward.

The battery cell tray 110 includes partition walls 111 dividing the battery cell tray 112 so as to set respective battery cell mounting positions and a total of nine battery cell trays 112 are formed.

The cylindrical battery cell 101 is housed in a battery cell tray 112a formed at the center of the battery cell tray 110 in a plan view. However, when two or more battery cells 101 are accommodated, It may be housed in another battery cell tray 112 facing the inner circumferential surface of the battery cell tray 112.

In this case, however, the two or more battery cells 101 are prevented from being detached from the battery cell tray 110 due to the centrifugal force generated by the rotation of the magnetic pole applying unit 120 At the same time, the irregularities of the stress applied to the rotary shaft 121 of the stimulus applying unit 120 are eliminated, so that the stimulation applying unit 120 can be prevented from being damaged.

The height H1 of the barrier rib 111 is about 60% of the height H2 of the battery cell 101. [

Therefore, the battery cell 101 can be easily removed from the battery cell tray 110 after the impregnation process of the electrolyte solution with respect to the electrode assembly is completed while maintaining a stable storage state in the battery cell tray 110 .

3 is a schematic view schematically showing a structure of a battery cell tray of an electrolyte solution impregnating apparatus for manufacturing a battery cell according to another embodiment of the present invention.

Referring to FIG. 3, the battery cell tray 30 has a rectangular shape in a plan view, and has an upwardly facing depressed shape with an upper surface opposed to the position of the magnetic pole applying portion opened.

And a partition 311 for dividing the battery cell tray 312 so as to set the battery cell loading position of each of the battery cell trays 310. A total of nine battery cell trays 312 are formed.

The outer periphery 311a of the partition 311 corresponding to the opened upper surface of the battery cell tray 310 has a tilted structure in which the height H3 of the partition 311 becomes smaller toward the battery cell 301 Respectively.

The remaining structure except for the above structure is the same as that of the battery cell tray of FIG. 2, so a detailed description thereof will be omitted.

FIG. 4 is a schematic view schematically showing the structure of an electrolyte solution-impregnating apparatus for manufacturing a battery cell according to another embodiment of the present invention.

Referring to FIG. 4, the electrolyte infiltrating apparatus 400 for manufacturing a battery cell includes a battery cell tray 410 and a magnetic pole applying unit 420.

The battery cell tray 410 has a shape in which an upper surface opposite to the position of the stimulus applying unit 420 is opened downward.

The side walls 411 of the battery cell trays 410 formed in accordance with the recessed shape are connected to the side walls 411 of the battery cell trays 410, It is possible to prevent the battery cell 401 from flowing and being damaged due to the physical stimulation applied from the stimulus applying unit 420 by stably supporting the battery cell 401.

The battery cell 401 is housed in the battery cell tray 410, and about 90% of the battery cell 401 is supported on the liquid medium 240 based on the outer surface area.

Therefore, the physical stimulation from the stimulus applying unit 420 can be more effectively transmitted to the battery cell 401 through the liquid medium 430, with minimal loss.

The physical stimulation from the stimulus application unit 420 is uniformly transferred to the most part of the battery cell 401 carried on the liquid medium 430, It is possible to effectively prevent problems such as short-circuiting of the electrode assembly, which may be caused by the concentration of physical stimulation on a specific region such as a portion adjacent to the electrode 420.

The stimulus applying unit 420 is formed of a columnar ultrasonic horn and is placed in contact with the lower surface 412 of the battery cell tray 410.

The stimulus applying unit 420 applies ultrasonic waves having a frequency of 20 kHz to 100 kHz and an amplitude of 2 to 30 탆 so that ultrasonic waves oscillate the liquid medium 430, 410, thereby improving impregnation of the electrolyte solution in the electrode assembly in the battery cell.

The physical stimulation performed by the ultrasonic waves of the stimulus application unit 420 may be applied once or periodically or non-periodically twice or more, and the stimulus application unit 420 may be applied to the battery cell tray 410, A physical stimulation in the form of vibration through ultrasonic waves in a state of being closely attached to the battery cell tray 410 in one or two or more directions depending on conditions such as the number of the cells 401, Of course.

Those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Claims (21)

An apparatus for improving wetting of an electrolyte solution in an electrode assembly in a battery cell,
A battery cell tray having a shape in which at least one battery cell is housed, the cell cell tray having a top surface opened in a downward direction with respect to the ground; And
A magnetic pole applying unit that is in contact with one side of the battery cell tray and faces the battery cell tray and applies a physical magnetic pole to the battery cell tray;
And an electrolyte solution containing the electrolyte solution. The battery cell according to claim 1, wherein the battery cell has a structure in which an electrode assembly including a cathode, a cathode, and a separator interposed between the anode and the cathode is embedded in a battery case together with an electrolyte, Device. The apparatus according to claim 1, wherein the magnetic pole applying unit is fixed on a lower surface of a battery cell tray, and a physical stimulus is applied by rotation. The apparatus according to claim 3, wherein the stimulus applying unit rotates in a clockwise or counterclockwise direction in a plane to apply a physical stimulus. The apparatus according to claim 3, wherein the stimulus applying unit applies a physical stimulus by alternately repeating rotation in a clockwise direction and a counterclockwise direction on a plane. 4. The electrolyte impregnating apparatus for a battery cell according to claim 3, wherein the magnetic pole applying unit rotates at a speed of 2,000 rpm to 4,000 rpm. The battery pack as claimed in claim 3, wherein the battery cells stored in the battery cell trays are located at a central portion of the battery cell tray, or two or more battery cells are arranged in a direction facing each other with the inner- And the electrolytic solution impregnated with the electrolytic solution. [8] The apparatus according to claim 7, wherein the battery cell tray has a circular or square shape in plan view. The battery cell according to claim 7, wherein the battery cell tray includes a partition wall for dividing the battery cell housing part so as to set respective battery cell mounting positions for two or more battery cells. . The apparatus according to claim 9, wherein the height of the barrier ribs is 50% to 90% of the height of the battery cells housed in the battery cell trays. The electrolyte impregnating apparatus of claim 1, wherein the physical stimulus is applied by ultrasonic waves generated from a stimulus applying unit. The electrolyte impregnating apparatus for a battery cell according to claim 11, wherein the ultrasonic wave has a frequency of 20 kHz to 100 kHz and an amplitude of 2 탆 to 30 탆. 12. The apparatus according to claim 11, wherein the ultrasonic waves are applied one or more times, cyclically or non-periodically. 12. The apparatus according to claim 11, wherein the battery cells are carried on a liquid medium while being housed in the battery cell trays. 15. The electrolyte-impregnating apparatus for a battery cell according to claim 14, wherein at least 50% of the battery cells are supported on a liquid medium based on an outer surface area thereof. 15. The electrolyte solution impregnating apparatus of claim 14, wherein the liquid medium is water. A method of impregnating an electrode assembly with an electrolytic solution by using the electrolytic solution impregnating apparatus for manufacturing a battery cell according to claim 1,
i) receiving the battery cell through an open upper surface of the battery cell tray;
ii) applying a physical stimulus to the battery cell by operating a stimulus applying unit in a state where the battery cell is housed in the battery cell tray; And
iii) separating the battery cell to which the physical stimulation is applied from the battery cell tray;
Wherein the electrolyte solution is prepared by a method comprising the steps of: 18. The method of claim 17, wherein the magnetic pole applying unit is fixed on a lower surface of the battery cell tray, and a physical stimulus is applied by rotation. 18. The method according to claim 17, wherein the physical stimulation is applied by ultrasonic waves generated in a stimulus application unit. The battery cell according to claim 1, wherein the battery cell is fabricated using the electrolyte impregnating apparatus for manufacturing a battery cell. A battery pack comprising at least one battery cell according to claim 20.

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