KR20180076158A - Buffer Plate for Uniform SEI Formation, and Battery Manufacturing Method thereof - Google Patents

Abstract

The present invention relates to a buffer plate for uniform formation of a solid electrolyte interface (SEI) of a lithium secondary battery, which is provided to prevent non-uniformity of an electrode interface caused when an activation gas generated during initial charge of the lithium secondary battery is located at an interface between an electrode and a separator; and relates to the method thereof. The buffer plate for uniform formation of a SEI and the method thereof are effective in excluding the activation gas generated during the initial charge to the outside of a pouch type battery cell, and in preventing the activation gas generated during the initial charge from being located in the electrode interface as the activation gas can be moved to a gas pocket in the battery cell. According to the present invention, a buffer plate for an activation tray is provided to exclude a gas generated during initial charge of a battery cell including an anode, a cathode, a separator, an electrolyte in an inner space from an interface between an electrode and the separator.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a buffer plate for uniform SEI formation and a battery manufacturing method using the buffer plate. 2. Description of the Related Art Buffer Plate for Uniform SEI Formation,

More particularly, the present invention relates to a buffer plate for forming a uniform SEI (Solid Electrolyte Interface) layer, and more particularly, (SEI) layer of a rechargeable lithium battery, which is formed in order to prevent the non-uniformity of the electrode interface from occurring.

In general, the secondary battery includes a nickel cadmium battery, a nickel metal hydride battery, a lithium ion battery, and a lithium ion polymer battery. Such a secondary battery is not only a compact product such as a digital camera, a P-DVD, an MP3P, a mobile phone, a PDA, a portable game device, a power tool and an e-bike, but also a large product requiring high output such as an electric car or a hybrid car, Power storage devices for storing power generation and renewable energy, and backup power storage devices.

The lithium secondary battery is charged and discharged while repeating a process in which lithium ions are intercalated and deintercalated from the lithium metal oxide in the positive electrode to the graphite electrode in the negative electrode. The electrolyte for the lithium secondary battery reacts with the carbon of the graphite constituting the negative electrode to form SEI (Solid Electrolyte

Interface, hereinafter referred to as SEI film), which is known to be one of the main factors affecting the performance of a battery by affecting charge transfer.

Once the SEI membrane is formed at the initial charging, it will prevent the reaction between the lithium ion and the negative electrode or other materials during repeated charging and discharging by the use of the battery. As an ion tunnel, which passes only lithium ions between the electrolyte and the negative electrode Role.

In general, the lithium secondary battery repeatedly shrinks and expands as it is charged and discharged during use, which may cause deterioration of the charge / discharge efficiency and cycle characteristics of the electrode active material due to peeling from the current collector. In order to prevent this, stable formation of SEI film is required.

Generally, the lithium secondary battery is manufactured by inserting an electrode assembly into a center case, preparing a battery cell, and injecting and sealing an electrolyte. And then a forming process of initially charging the battery cell is performed to produce a lithium secondary battery. Conventionally, attempts have been made to stably form the SEI film by improving the composition of an electrolyte or an anode material. However, there has been no attempt to form a stable SEI film by improving the manufacturing process of the lithium secondary battery, particularly the forming process conditions.

In Japanese Patent No. 5487743 (Apr. 31, 2014), a power generation element in which an anode and a cathode are stacked through an electrolyte layer including a separator in an internal space formed by a sealing portion, and a current collector connected to each of the anode and the cathode Wherein the thin film battery further includes a tube penetrating through the sealing portion and having one end in the inner space and the other end in an outer space of the sealing portion so that the tube is connected to the current collector in the inner space, Having a flexible first conductor portion having a thickness such that the electrolyte solution does not leak from the tube after having an opening area that allows the electrolyte solution to be filled into the inner space and at the same time pressing the tube, and an insulating outer tube portion covering the first conductor portion And a negative electrode.

Japanese Patent Laid-Open Publication No. 2000-188135 (2000.07.04) discloses an aging device for dividing a plurality of shelves into an atmosphere sensor for detecting the atmosphere in the shelf, a feed port for the digestive gas And the supply port of the digestive gas is opened and closed by a signal of the atmosphere sensor for each shelf.

In Japanese Patent Laid-Open Publication No. 2001-210372 (Aug. 03, 2001), a metal foil is disposed between resin films to form a laminate-type laminate sheet in which the entire laminate is integrated. Each sheet-like or film-like positive electrode plate, A positive electrode lead and a negative electrode lead to which one end of each of the positive electrode plate and the negative electrode plate are connected is taken out to the outside of the sealing portion of the external case, And a step of finishing the generation of the initial gas by performing a supercharging process until a predetermined cell voltage is generated in an environment of 45 to 70 ° C and a step of finishing the generation of the initial gas, , A step of generating gas from the power generation element and stabilizing the battery characteristics, and a step of forming a part of the outer case And then discharging the collected gas to the inside of the battery case, and then sealing the external case again.

In Korean Patent Registration No. 10-1481860 (Jan. 15, 2014), an electrode assembly including a cathode, a cathode, and a separator interposed between the anode and the cathode is inserted into a battery case to manufacture a battery cell; Injecting and sealing an electrolyte containing lithium oxalyl difluoroborate (LiODFB) additive in an amount of 0.1 to 2% by weight based on the total amount of the electrolytic solution in the battery case; Forming the battery cell; And removing the gas in the battery case and degassing the battery cell, wherein the forming includes initially charging the battery cell to 20 to 40% of the battery capacity, Lt; / RTI >

However, in order to prevent the uniformity of the SEI (Solid Electrolyte Interface) layer formed on the surface of the electrode of the battery cell that performs initial charging from being reduced, a buffer plate formed on the activation tray for performing initial charging after storing the battery cells A buffer plate for forming a uniform SEI (Solid Electrolyte Interface) layer of a rechargeable lithium battery, and a method of the same, which is characterized in that an active gas formed on an electrode interface is moved to a battery cell gas- none.

Japanese Patent Publication No. 5487743 (Apr. Japanese Patent Application Laid-Open No. 2000-188135 (July 24, 2000) Japanese Patent Application Laid-Open No. 2001-210372 (Aug. 03, 2001) Korean Patent Registration No. 10-1481860 (2015.01.14)

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a lithium secondary battery, in which, when securing the performance of a battery through an initial charging process after assembling a battery cell, And a buffer plate for forming a uniform SEI (Solid Electrolyte Interface) layer for excluding an active gas located at a separator interface and a method therefor.

It is a further object to provide a buffer plate and method for forming a uniform SEI (Solid Electrolyte Interface) layer that can fill a space between battery cells mounted on an activation tray for performing initial charging of the battery cell.

In addition, since the active gas generated by the initial charging can control the non-uniformity due to the gas trap of the battery cell, uniform interfacial reaction becomes possible, and a uniform SEI (Solid Electrolyte Interface) layer can be formed, And to provide a buffer plate for forming a uniform SEI (Solid Electrolyte Interface) layer capable of improving the quality of the buffer plate.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide an apparatus and a method for manufacturing a fuel cell including an anode, a cathode, a separator, A buffer plate for trays is provided.

In addition, the buffer plate may move the gas generated at the electrode interface of the battery cell to the gas pocket of the battery cell.

The battery cell may be inserted into the battery cell while being in contact with one or both surfaces of the battery cell.

The buffer plate may include a cover portion and a plurality of insertion plates.

In addition, the cover portion may further include a plurality of discharge slots for discharging the gas transferred to the gas pocket.

Further, the horizontal cross section of the insertion plate may be a rectangular shape.

Further, the vertical cross section of the insertion plate may be a rectangular shape.

Further, it may be an activation tray including the activation tray buffer plate.

Also, the pouch-type secondary battery may be an initial pouch in the activation tray including the buffer plate.

In addition, an electronic device to which a battery pack including a pouch-type secondary battery is applied may be an initial charge in an activation tray including a buffer plate.

Further, an electric vehicle to which the battery pack including the pouch-type secondary battery is applied may be an initial charge in the activation tray including the buffer plate.

In addition, a hybrid vehicle to which a battery pack including a pouch-type secondary battery is applied may be an initial charge in an activation tray including a buffer plate.

Also, the battery pack may be a power storage device including a pouch-type secondary battery, which is initialized in an activation tray including a buffer plate.

It is another object of the present invention to provide a method of manufacturing a battery cell by inserting an electrode assembly including an anode, a cathode, and a separator interposed between the anode and the cathode into a battery cell case, Stage 1; A second step of injecting and sealing an electrolyte solution into the battery cell case; A third step of forming the battery cell; A fourth step of aging the formed battery cell; And a fifth step of degassing and degassing the gas in the battery cell case accommodating the aged battery cell. In the third step, the gas generated during the initial charging of the battery cell flows between the electrode and the separator And performing an initial charge in an activation tray including a buffer plate to exclude that it is located at an interface.

In addition, the buffer plate may move the gas generated at the interface between the electrode of the battery and the separator to the gas pocket of the battery.

In the third step, the buffer plate may be inserted while being in contact with one or both surfaces of the battery and the cell gas pocket inserted in the cell gas pocket formed in the activation tray.

The buffer plate for forming a uniform SEI layer according to the present invention and the method for fabricating a battery using the buffer plate according to the present invention have the effect of excluding the active gas generated during initial charging from the pouch of the battery cell.

In addition, the present invention has the effect that the activation gas can move into the gas-gas pocket of the battery cell, and thus the activation gas generated during the initial charging can not be positioned at the electrode interface.

Further, the present invention can control the nonuniformity due to the gas trap, and has an effect of enabling a uniform interfacial reaction.

In addition, the present invention is capable of manufacturing a battery cell having a uniform SEI layer, thereby improving the quality uniformity of a product using the battery cell.

In addition, the buffer plate exhibits an effect of being pressurized due to a cell expanding between charges, so that the active gas generated during charging can be moved from the electrode interface of the battery cell to the gas pocket of the battery cell.

FIG. 1 is a view showing a battery cell mounted in a conventional activated tray before initial charging.
FIG. 2 is a view showing a battery cell which is mounted after initial charging in a conventional activation tray.
3 is a view illustrating an activation tray to which a buffer plate according to an embodiment of the present invention is coupled.
4 is a vertical sectional view of a buffer plate and an insertion plate according to an embodiment of the present invention.
5 is a horizontal cross-sectional view of a cover portion and an insertion plate of a buffer plate according to an embodiment of the present invention.
6 is a view illustrating insertion of a battery cell into the pre-charge buffer plate according to an embodiment of the present invention.
FIG. 7 illustrates insertion of a battery cell into a buffer plate after initial charging according to an embodiment of the present invention. Referring to FIG.
8 is a photograph of a battery cell inserted into an unused activated tray of a buffer plate according to an embodiment of the present invention.
FIG. 9 is a photograph showing an interface shape of a battery cell after initial charging using an unused activated tray of a buffer plate according to an embodiment of the present invention. FIG.
10 is a photograph showing the shape of an interface of a battery cell after initial charging using an activated tray to which a buffer plate according to an embodiment of the present invention is applied.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the detailed description of known functions and configurations incorporated herein will be omitted when it may unnecessarily obscure the subject matter of the present invention.

The same reference numerals are used for portions having similar functions and functions throughout the drawings. Throughout the specification, when a part is connected to another part, it includes not only a case where it is directly connected but also a case where the other part is indirectly connected with another part in between. In addition, the inclusion of an element does not exclude other elements, but may include other elements, unless specifically stated otherwise.

The present invention will be described in detail with reference to the drawings.

FIG. 1 is a view showing a battery cell mounted in a conventional activated tray before initial charging.

Generally, in manufacturing a lithium secondary battery, a positive electrode current collector and a negative electrode current collector are first coated with a mixture of an active material, a binder and a plasticizer to prepare a positive electrode plate and a negative electrode plate, and the positive electrode plate and the negative electrode plate are laminated on both sides of the separator, The battery cell is inserted into the battery case, and the electrolyte solution is injected and sealed to complete the battery pack.

However, in order to secure the battery performance, especially the stability of the life after the lithium secondary battery is assembled, the battery must undergo two processes, that is, formation and aging, before shipment. The forming process activates the battery by repeating charging and discharging after assembling the battery. In this process, lithium ions from a lithium metal oxide used as an anode during charging move to and inserted into a carbon electrode used as a cathode. Since lithium is highly reactive, it reacts at a carbon anode to form a compound such as Li 2 CO 3, LiO, , Which form a coating on the surface of the carbon anode. Such a film is referred to as a SEI (Solid Electrolyte Interface) layer. This SEI layer is a non-conductive material, and once formed, functions to prevent lithium ions and other materials from reacting at the carbon anode during charging. Further, the SEI layer functions as a kind of ion tunnel, and functions to pass only lithium ions. By such an ion tunnel effect, it is prevented that organic solvents having a large molecular weight, which dissolve lithium ions and move together, are inserted together into the carbon negative electrode to collapse the structure of the carbon negative electrode. That is, once the SEI layer is formed, since lithium ions do not undergo side reactions with carbon anodes and other materials, not only the amount of lithium ions can be reversibly maintained, but also organic solvents are inserted together with lithium ions, By preventing the structure from collapsing, the charge / discharge of the lithium secondary battery is reversibly maintained, and the battery life is improved.

The formation of the majority of the SEI layer occurs immediately upon initial charging of the formation process. The first charge curve in the formation process shows the flatness curve of the potential at about 3.4 to 3.7 V, which is the interval in which the SEI layer is created by the lithium ion intercalating into the carbon negative electrode to meet with the carbon negative electrode. Also, when comparing the capacity of the battery at the initial charge and the capacity of the battery at the initial discharge, it is confirmed that the capacity is reduced by about 10% -30% at the time of discharging compared with the charging. This capacity reduction is the SEI layer created and consumed capacity.

Thus, the role of the SEI layer in lithium secondary batteries is important, and the phosphorus process for forming the SEI layer plays an important role in determining the lifetime of the battery. However, formation of the SEI layer through the formation does not necessarily result in a battery having a good life. If the SEI film is not formed uniformly and stably and is roughly formed on the surface of the carbon anode, the lithium ions will continue to form the SEI layer continuously while charging and discharging the lithium ion, and as a result, a large amount of capacity is continuously decreased , Thereby reducing the amount of available lithium ions and shortening the life of the battery. Therefore, the condition of the forming process should be set so that the SEI layer is uniformly and stably formed. For this purpose, a method of allowing lithium ions to reach the carbon cathode stably by using a low current during formation and a method of increasing the number of forming processes can be considered. Both of these methods, however, are disadvantageous in terms of cost and productivity.

The lithium secondary battery has battery performance in the form of a product through the initial charging process after the assembling process of assembling the battery cell. In the case of the pouch type battery cell in the initial charging for such a formation, the pouch type battery cell is inserted into the battery cell gas pocket of the activation tray of FIG. During the initial charge, the electrolyte is decomposed due to the electrochemical reaction with the electrode, and is converted to a gas form, which is located at the interface between the electrode and the separator.

The active gas is trapped at the interface between the electrode and the separator and is not charged at the corresponding position, resulting in non-uniformity of the electrode interface due to the uneven charging environment. Therefore, the non-uniformity of the interfacial reaction directly affects the quality of the produced battery by lowering the uniformity of the SEI layer.

FIG. 2 is a view showing a battery cell which is mounted after initial charging in a conventional activation tray.

After the activated tray pouch type battery cell identified in FIG. 1 is inserted, when the initial charging progresses, the generated active gas is distributed on the pouch electrode and the separator interface as shown in FIG. It is necessary to improve the formation process for uniform SEI formation by such initial charging.

When the battery cell is placed in the battery cell gas pocket in the activation tray for charging into the charging and discharging equipment, the space between the battery cell and the battery cell is located with some space. The activated gas generated after the initial charging is trapped between the battery cells folded by the pouch rather than moving to the gas gas pocket, so that the cup surface of the battery cell swells up as shown in FIG. The unevenness of the electrode interface due to the trap of the activating gas after the initial charging causes the uniformity of SEI layer formation to be lowered.

3 is a view illustrating an activation tray to which a buffer plate according to an embodiment of the present invention is coupled.

A chargeable and discharging plate is filled with a plate that can fill the space between the battery cells, and the active gas generated during the initial charging is removed at the electrode and separator interface. A buffer plate as shown in FIG. 3 is applied so that the generated gas can be pushed out of the battery cell folded by the pouch. The buffer plate may include a cover including an ejection slot and an insertion plate. However, it is apparent that the present invention is not limited to the shape of the battery, as long as the gas generated during the initial charging process can be moved to the outside of the folded battery cell by the pouch. The buffer plate of FIG. 3 is configured to surround the battery cell gas pocket of the existing activation tray in the form of a hair comb.

The present invention provides a buffer plate for an activation tray for removing gas generated at the initial charging of a battery cell including an anode, a cathode, a separator, and an electrolyte in an internal space at an interface between the electrode and the separator.

In addition, the buffer plate may move the gas generated at the electrode interface of the battery cell to the gas pocket of the battery cell.

In addition, the battery cell can be inserted while touching one side or both sides of the battery cell gas pocket and the battery cell inserted and held in the cell cell gas pocket formed in the activation tray.

The buffer plate may include a cover portion and a plurality of insertion plates.

The cover portion formed on the buffer plate forms an upper portion of the buffer plate to be coupled after inserting the battery cell into the activation tray for initial charging.

The gas discharge slot formed in the buffer plate cover portion is for discharging the gas of the battery cell generated at the time of initial charging.

The buffer plate is formed to discharge the gas generated in the battery cell in a state where the activation tray is coupled, and the gas collected in the gas pocket of the battery cell can be easily discharged through the slot.

In addition, the cover portion may further include a plurality of discharge slots for discharging the gas transferred to the gas pocket.

4 is a vertical sectional view of a buffer plate and an insertion plate according to an embodiment of the present invention.

Further, the horizontal cross section of the insertion plate may be a rectangular shape.

The horizontal cross section of the insertion plate may be formed in a rectangular shape, a concavo-convex shape, a concave shape or a convex shape at both ends at the center of the horizontal cross-section.

The concavo-convex shape of the horizontal section may be any one of rectangular, hemispherical, triangular, and wavy patterns.

According to the shape of the horizontal cross section of the insertion plate, insertion into the battery cell mounted on the activation tray can be facilitated and gas generated on the electrode surface can be easily moved to the gas pocket portion of the battery cell.

Further, the vertical cross section of the insertion plate may be a rectangular shape.

5 is a horizontal cross-sectional view of a cover portion and an insertion plate of a buffer plate according to an embodiment of the present invention.

The vertical cross section of the insertion plate may be formed in a rectangular shape, a concavo-convex shape, and a rhombus shape having a larger thickness from the center of the vertical cross section to the lower end thereof.

The concavo-convex shape of the horizontal section may be any one of rectangular, hemispherical, triangular, and wavy patterns.

According to the shape of the vertical cross section of the insertion plate, insertion into the battery cell mounted on the activation tray can be facilitated and gas generated on the electrode surface can be easily moved to the gas pocket portion of the battery cell.

It is possible to exclude the electrode interface position of the generated gas by mounting a plate having a thickness and a shape that can fill a space between the cell and the cell of the activating tray and the plate is connected to the upper or lower end, It may be possible to put it in a direction. There is no space between the battery cells, and the activation gas moves to the gas gas pocket, so that no gas trap is formed at the electrode interface, and a uniform reaction can be performed, so that the SEI layer can be uniformly formed.

6 is a view illustrating insertion of a battery cell into the pre-charge buffer plate according to an embodiment of the present invention.

FIG. 7 illustrates insertion of a battery cell into a buffer plate after initial charging according to an embodiment of the present invention. Referring to FIG.

Further, it may be an activation tray including the activation tray buffer plate.

Also, the pouch-type secondary battery may be an initial pouch in the activation tray including the buffer plate.

In addition, an electronic device to which a battery pack including a pouch-type secondary battery is applied may be an initial charge in an activation tray including a buffer plate.

Further, an electric vehicle to which the battery pack including the pouch-type secondary battery is applied may be an initial charge in the activation tray including the buffer plate.

In addition, a hybrid vehicle to which a battery pack including a pouch-type secondary battery is applied may be an initial charge in an activation tray including a buffer plate.

Also, the battery pack may be a power storage device including a pouch-type secondary battery, which is initialized in an activation tray including a buffer plate.

It is another object of the present invention to provide a method of manufacturing a battery cell by inserting an electrode assembly including an anode, a cathode, and a separator interposed between the anode and the cathode into a battery cell case, Stage 1; A second step of injecting and sealing an electrolyte solution into the battery cell case; A third step of forming the battery cell; A fourth step of aging the formed battery cell; And a fifth step of degassing and degassing the gas in the battery cell case accommodating the aged battery cell. In the third step, the gas generated during the initial charging of the battery cell flows between the electrode and the separator And performing an initial charge in an activation tray including a buffer plate to exclude that it is located at an interface.

In addition, the buffer plate may move the gas generated at the interface between the electrode of the battery and the separator to the gas pocket of the battery.

In the third step, the buffer plate may be inserted while being in contact with one or both surfaces of the battery and the cell gas pocket inserted in the cell gas pocket formed in the activation tray.

(Example)

Experiments were conducted to confirm the uniformity of the SEI layer when the buffer plate was applied.

The battery used in the experiment is an automobile battery having an area of about 300 cm 2 and is composed of the anode and cathode separator described above. The cell was charged for 3 hours at a current of 6A, regardless of whether it was pressurized. After the first initial charge, both batteries were subjected to the same post-treatment. After the degassing process to remove the active gas, the battery was charged at 100% to confirm the charge. The unfilled region due to the presence of the active gas is displayed in black, and the region where the charging has proceeded is displayed in gold, so that uniformity can be distinguished.

The interface of the battery cell after the experiment is as shown in FIGS. 9 and 10. FIG. The use of the buffer plate enabled the activation gas to be pushed to the gas gas pocket rather than being located between the electrode assemblies, thus confirming the clean electrode interface.

FIG. 10 shows that the activation gas in the electrode assembly of the battery cell, which is initially charged using the activation tray with the buffer plate applied thereto, It is confirmed that a uniform interface is formed by moving to the pocket.

8 is a photograph of a battery cell inserted into an unused activated tray of a buffer plate according to an embodiment of the present invention.

FIG. 9 is a photograph showing an interface shape of a battery cell after initial charging using an unused activated tray of a buffer plate according to an embodiment of the present invention. FIG.

10 is a photograph showing the shape of an interface of a battery cell after initial charging using an activated tray to which a buffer plate according to an embodiment of the present invention is applied.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the above teachings. It is to be understood that such modified embodiments are also within the scope of protection of the present invention as defined by the appended claims.

100: Battery cell
110: electrode assembly
120: Pouch
130: Gas gas pocket
200: Activation tray
210: battery cell gas pocket
220: Activation tray case
230: Activation tray cover
300: buffer plate
310: cover
311: Discharge slot
320: insert plate

Claims (16)

A buffer plate for an activating tray for removing gas generated at the initial charging of a battery cell including an anode, a cathode, a separator, and an electrolyte in an internal space at an interface between the electrode and the separator.
The method according to claim 1,
Wherein the buffer plate moves the gas generated at the electrode interface of the battery cell to the gas pocket of the battery cell.
The method according to claim 1,
Wherein the inserting plate is inserted into one side or both sides of the battery cell inserted and held in the cell cell gas pocket formed in the activation tray.
The method according to claim 1,
Wherein the buffer plate comprises a cover portion and a plurality of insertion plates.
5. The method of claim 4,
Wherein the cover portion further comprises a plurality of discharge slots for discharging gas transferred to the gas pocket.
6. The method of claim 5,
Wherein the horizontal plate of the insert plate is rectangular.
6. The method of claim 5,
Wherein the vertical cross-section of the insert plate is rectangular.
8. A method according to any one of claims 1 to 7,
Wherein the activation tray comprises a buffer plate.
A method according to any one of claims 1 to 7,
Wherein an initial charge is performed in an activation tray including a buffer plate.
A method according to any one of claims 1 to 7,
Wherein the pouch type secondary battery is initially charged in an activation tray including a buffer plate.
A method according to any one of claims 1 to 7,
Wherein an initial charge is performed in an activation tray including a buffer plate.
A method according to any one of claims 1 to 7,
Wherein the battery pack comprises a pouch type secondary battery in which initial charging is performed in an activation tray including a buffer plate.
A method according to any one of claims 1 to 7,
Wherein the battery pack includes a pouch-type secondary battery, the battery pack including a pouch type secondary battery,
A first step of inserting an electrode assembly including a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode into a battery cell case to manufacture a battery cell;
A second step of injecting and sealing an electrolyte solution into the battery cell case;
A third step of forming the battery cell;
A fourth step of aging the formed battery cell; And
And a fifth step of removing and degassing the gas in the battery cell case accommodating the aged battery cell,
Wherein the initial charging is performed in an activation tray including a buffer plate for eliminating a gas generated during initial charging of the battery cell from an interface between the electrode and the separator. Way.
15. The method of claim 14,
Wherein the buffer plate moves the gas generated at the interface between the electrode of the battery and the separator to the gas pocket of the battery.
15. The method of claim 14,
Wherein the buffer plate is inserted into one side or both sides of the battery and the cell gas pocket inserted and held in the cell gas pocket formed in the activation tray.

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