Formation method for pouch-type battery cells

Abstract

This invention provides a method for arranging pouch-type battery cells that enable stable charging and discharging. [Solution] A method for arranging battery cells using a pouch-type battery cell arrangement device, comprising: a first charging step S10 in which the battery cells are charged in a charging section; a hole processing step S30 in which discharge holes are formed in the gas pockets of the charged battery cells; a gas discharge step S50 in which internal gas generated during charging is discharged through the discharge holes; and a sealing step S70 in which the discharge holes are sealed.

Description

Technical Field

[0001] The present invention relates to a formation method for a pouch-type battery cell.

[0002] More specifically, the present invention relates to a formation method for a pouch-type battery cell that can prevent electrolyte from being discharged together when gas generated during a formation process of a battery cell is discharged, and can prevent external contamination caused thereby.

[0003] The present application claims the benefit of priority based on Korean Patent Application No. 10-2022-0113041 filed on September 6, 2022, and all contents disclosed in the document of said Korean patent application are incorporated as a part of the present specification. Background Art

[0004] Generally, secondary batteries can be classified into cylindrical, prismatic, or pouch-type according to their shapes. Among them, a pouch-type secondary battery forms its exterior using a pouch outer packaging composed of a multilayer film of a metal layer (foil) and synthetic resin layers coated on the upper and lower surfaces of the metal layer. Therefore, the weight of the battery can be significantly reduced compared to cylindrical or prismatic batteries using metal cans, which enables weight reduction of the battery and allows modification into various forms. For these advantages, it has attracted much attention. An electrode assembly is housed in a stacked form in such a pouch-type secondary battery, an electrode tab and an electrode lead are connected to the electrode assembly, and the electrode lead protrudes from the pouch outer packaging. Such an electrode lead comes into contact with and is electrically connected to an external device, and is supplied with power from the external device.

[0005] A pouch-type secondary battery is manufactured through a process of assembling a cell and a process of activating the battery. In the battery activation step, a secondary battery cell is mounted on a charging and discharging device, and charging and discharging are performed under conditions necessary for activation. The process of performing predetermined charging and discharging using a charging and discharging device to activate a battery in this manner is referred to as a formation process.

[0006] During this formation process, both sides of the battery cell can be pressurized using a pressurizing means such as a jig (Zig) containing a flat pressure plate during activation charging; this is also called jig formation.

[0007] The jig formation described above can prevent the negative electrode from expanding during the activation process, promote the chemical reaction of the battery to induce gas generation, and move the generated internal gas to the gas pocket.

[0008] Here, when the electrode assembly is placed inside the pouch, the electrolyte is injected, and the formation process is performed while it is sealed, a gas is generated by the chemical reaction between the electrolyte and the electrodes, causing the gas pocket of the pouch-type secondary battery to expand.

[0009] When the gas pocket expands excessively in this way, interference and collision with the transport means may occur when the battery cells are unloaded from the jig formation equipment. Furthermore, interference between battery cells during the transport process can cause defects in the appearance of the battery cells, and an excessive amount of pouching is required to create sufficient internal space in the gas pocket.

[0010] To solve the problems described above, exhaust holes are formed in the gas pockets of the battery cells during the battery cell formation process, allowing the gas generated during charging to be discharged to the outside.

[0011] However, there was a problem in that by forming a discharge hole in the gas pocket of the battery cell, the internal pressure of the battery cell would increase when gas was discharged, causing the electrolyte to be discharged along with the gas, contaminating the outside and potentially leading to a safety accident. [Prior art documents] [Patent Documents]

[0012] [Patent Document 1] Korean Published Patent Publication No. 10-2013-0024807 [Overview of the project] [Problems that the invention aims to solve]

[0013] The present invention was created to solve the above-mentioned problems, and aims to provide a method for forming pouch-type battery cells that enables stable charging and discharging by partially charging pouch-type battery cells in the formation process to generate gas, partially expanding the vacuum-sealed portions of the gas pockets so that they separate from each other, forming discharge holes in the partially expanded gas pockets to discharge only the internal gas to the outside without discharging the electrolyte, and then naturally discharging the internal gas generated during the process while residual charging is performed again on the battery cells from which the gas has been discharged.

[0014] The objective is to provide a method for forming pouch-type battery cells that prevents surrounding contamination by preventing the discharge of electrolyte along with gas discharge, by discharging only the internal gas generated in the battery cells during the formation process. [Means for solving the problem]

[0015] To address the above-mentioned challenges, the present invention provides a method for forming a battery cell (pouch-type battery cell), characterized by comprising: a first charging step of charging the battery cell in a charging section; a hole processing step of forming discharge holes in the gas pocket portion of the charged battery cell; a gas discharge step of discharging internal gas generated during charging through the discharge holes; and a sealing step of sealing the discharge holes.

[0016] In one embodiment, the process may further include a second charging step in which the battery cell is charged after a gas discharge step in which internal gas is discharged through discharge holes formed in the gas pocket.

[0017] In another embodiment, the first charging stage may involve partially charging the battery cell and generating gas inside the battery cell to partially expand the gas pocket.

[0018] As a specific embodiment, partial charging may be performed until the battery cell is fully charged.

[0019] As another specific embodiment, partial charging may be performed at 50% or less of the total charging capacity of the battery cell.

[0020] As one embodiment, partial charging may be performed until the portion vacuum-adhered to the gas pocket portion of the battery cell is separated.

[0021] As another embodiment, after performing the first charging step on the battery cell, a discharge hole may be formed in the partially expanded gas pocket portion to discharge internal gas.

[0022] As one embodiment, in the second charging step, remaining charging may be performed after discharging gas through the discharge hole in the gas pocket portion.

[0023] As a specific embodiment, the remaining charging may be performed while discharging gas through the discharge hole in the gas pocket portion.

[0024] As another specific embodiment, the remaining charging may be performed until the battery cell is fully charged.

[0025] As still another specific embodiment, the remaining charging may be performed up to 70% of the total charging capacity of the battery cell. Effects of the Invention

[0026] According to the present invention, by partially charging a pouch-type battery cell and partially expanding the gas pocket portion such that the vacuum-adhered portions of the gas pocket portion are separated from each other to prevent excessive expansion of the gas pocket portion, discharge of electrolyte when forming a discharge hole in the gas pocket portion is prevented, and only internal gas can be stably discharged.

[0027] Furthermore, by performing partial and partial charging of the battery cells before and after the formation of discharge holes in the gas pockets of the battery cells during the formation process, only the internal gas can be discharged through the discharge holes, allowing for stable discharge of only the internal gas without the discharge of the electrolyte, thereby preventing contamination of the surrounding area. [Brief explanation of the drawing]

[0028] [Figure 1] This is a flowchart showing a method for arranging pouch-type battery cells according to one embodiment of the present invention. [Figure 2] This drawing schematically shows one embodiment of a pouch-type battery cell formation device for explaining the method of forming pouch-type battery cells according to the present invention. [Figure 3] This drawing schematically illustrates another embodiment of a pouch-type battery cell formation device for explaining the method of forming pouch-type battery cells according to the present invention. [Figure 4] This drawing schematically shows another embodiment of a pouch-type battery cell formation device for illustrating the method of forming pouch-type battery cells according to the present invention. [Modes for carrying out the invention]

[0029] The present invention will now be described in detail. Before that, however, the terms and words used herein and in the claims shall not be interpreted to be limited to their ordinary or dictionary meanings, but rather to be interpreted as meanings and concepts consistent with the technical idea of ​​the present invention, based on the principle that an inventor may appropriately define the concepts of terms in order to best describe his own invention.

[0030] As used throughout this specification, terms such as “includes” and “have” are intended to specify the existence of features, figures, stages, operations, components, parts, or combinations thereof as described in the specification, and are understood not to preemptively exclude the existence or possibility of adding one or more other features, figures, stages, operations, components, parts, or combinations thereof.

[0031] Furthermore, when a part such as a layer, film, region, or plate is said to be "on top" of another part, this includes not only the case where it is "directly above" the other part, but also the case where there is another part in between. Conversely, when a part such as a layer, film, region, or plate is said to be "below" another part, this includes not only the case where it is "directly below" the other part, but also the case where there is another part in between. Moreover, in the specification of this invention, being "placed on top" may include being placed not only at the top but also at the bottom.

[0032] Furthermore, when a part such as a layer, film, region, or plate is said to be "on top" of another part, this includes not only the case where it is "directly above" the other part, but also the case where there is another part in between. Conversely, when a part such as a layer, film, region, or plate is said to be "below" another part, this includes not only the case where it is "directly below" the other part, but also the case where there is another part in between. Also, in this application, being "placed on top" may include being placed not only at the top but also at the bottom.

[0033] (First Embodiment) Figure 1 is a flowchart showing a method for arranging pouch-type battery cells according to one embodiment of the present invention. Figure 2 is a schematic diagram showing one embodiment of a pouch-type battery cell arrangement device for illustrating the method for arranging pouch-type battery cells according to the present invention. Figure 3 is a schematic diagram showing another embodiment of the pouch-type battery cell arrangement device for illustrating the method for arranging pouch-type battery cells according to the present invention. Figure 4 is a schematic diagram showing yet another embodiment of the pouch-type battery cell arrangement device for illustrating the method for arranging pouch-type battery cells according to the present invention.

[0034] As shown in Figure 1, a battery cell formation method according to one embodiment of the present invention includes a first charging step (S10) of charging the battery cell in a charging unit, a hole processing step (S30) of forming discharge holes in the gas pocket portion of the charged battery cell, a gas discharge step (S50) of discharging internal gas generated during charging through the discharge holes, and a sealing step (S70) of sealing the discharge holes.

[0035] Specifically, the present invention is a formation method for performing predetermined charging and discharging on battery cells in order to activate the battery cells, wherein a first charging step is performed under conditions necessary for activating a plurality of battery cells arranged in a charging section (S10).

[0036] Here, the battery cells arranged in the charging section may be charged sequentially, or all battery cells arranged in the charging section may be charged simultaneously.

[0037] The first charging stage described above involves partially charging the battery cell, generating gas inside the battery cell, and partially expanding the gas pocket.

[0038] In other words, the first charging stage described above partially charges the battery cell, generating gas through a chemical reaction between the electrolyte inside the battery cell and the electrodes, thereby partially expanding the gas pocket portion of the battery cell.

[0039] Here, the partial charging described above may be performed to charge the battery cells until they are almost fully charged.

[0040] In this way, by charging the battery cells to just before full charge, it is possible to prevent the gas pocket from expanding excessively due to the gas generated when the battery cells are fully charged during the formation process of existing battery cells.

[0041] In this case, the partial charging described above may be performed to charge the battery cell to 50% or less of its total charging capacity.

[0042] In this way, by charging the battery cell to 50% or less of its total charge capacity, the amount of gas generated inside the battery cell can be adjusted to a predetermined level, thereby partially expanding the gas pocket to prevent excessive expansion and thus controlling the internal pressure of the battery cell.

[0043] Preferably, the above partial charging can be performed to charge the battery cell to 5% to 50% or less of its total charge capacity.

[0044] A hole processing step is performed to form discharge holes in the gas pocket portion of the battery cell that has been charged via the first charging step described above (S30).

[0045] Then, the gas inside the battery cell is discharged through the discharge hole formed in the gas pocket of the battery cell during the hole processing stage (S50).

[0046] Here, after the first charging stage is performed on the battery cell, an exhaust hole is formed in the partially expanded gas pocket, and the internal gas is discharged through the exhaust hole in the partially expanded gas pocket.

[0047] As described above, by partially charging the battery cell to partially expand the gas pocket area to prevent excessive expansion, and then forming an exhaust hole in the gas pocket area, it is possible to prevent the electrolyte from being discharged to the outside of the battery cell due to capillary action caused by the increase in internal pressure when the gas is discharged through the exhaust hole, and thus it is possible to discharge only the internal gas without discharging the electrolyte.

[0048] This may further include a second charging step (S60) in which the battery cell is charged after a gas discharge step in which the internal gas is discharged through the discharge hole formed in the gas pocket.

[0049] In this case, the second charging stage may involve discharging the gas through the discharge hole in the gas pocket and then performing residual charging.

[0050] The above-mentioned residual charge can be performed while discharging gas through the discharge hole in the gas pocket.

[0051] As described above, by partially charging the battery cell to partially expand the gas pocket, then forming an exhaust hole in the partially expanded gas pocket to temporarily release the gas generated inside the battery cell, and then performing residual charging on the battery cell from which the internal gas generated by the partial charging has been released, while also secondarily releasing the gas generated during residual charging, it is possible to stably perform residual charging and fundamentally prevent the external release of the electrolyte that has been vacuum-injected into the battery cell.

[0052] Here, the remaining charge can be used to charge the battery cell until it is fully charged, preferably up to 70% of the total charge capacity of the battery cell.

[0053] The following describes in more detail a method for arranging pouch-type battery cells according to one embodiment of the present invention, along with a pouch-type battery cell arrangement device.

[0054] First, as shown in Figure 2, a formation method for pouch-type battery cells using a formation device 1 will be described, which includes a charging unit 10 for charging the battery cells 3, a loading buffer unit 20 where the battery cells 3 wait before being loaded into the charging unit 10 and where the battery cells are placed by a loader / unloader 90, an unloading buffer unit 30 where the battery cells 3 that have been discharged from the charging unit 10 after charging is complete waits, a hole processing unit 50 provided on one side of the loading buffer unit 20 for forming discharge holes 3b in the gas pockets 3a of the battery cells 3 housed in the loading buffer unit 20, and a sealing unit 70 provided on one side of the unloading buffer unit 30 for sealing the discharge holes 3b formed in the gas pockets 3a of the battery cells 3 housed in the unloading buffer unit 30.

[0055] A laminate consisting of a positive electrode, a separator membrane, and a negative electrode is placed in a pouch and sealed, and then an electrolyte is injected into the pouch under vacuum to manufacture a pouch-type battery cell 3.

[0056] The manufactured battery cells 3 are supplied to the loading buffer unit 20, and the battery cells 3 supplied to the loading buffer unit 20 are transferred to the charging unit 10 for charging and discharging.

[0057] The battery cells 3 supplied to the charging unit 10 undergo predetermined charging and discharging by a charge / discharge device (not shown) provided in the charging unit 10 in order to activate the battery.

[0058] Specifically, the battery cell 3 supplied to the charging unit 10 is partially charged, generating gas inside the battery cell 3 and partially expanding the gas pocket 3a.

[0059] In this manner, the battery cell 3 is partially charged via the charging unit 10 to partially expand the gas pocket portion 3a, and then the battery cell 3 with the partially expanded gas pocket portion 3a is transferred to the loading buffer unit 20.

[0060] The battery cells 3, which have been transferred to and arranged in the loading buffer section 20, form discharge holes 3b in the partially expanded gas pocket section 3a via a hole processing section 50 provided on one side of the loading buffer section 20. That is, the hole processing section 50 moves toward the battery cells 3 that have been transferred to and arranged in the loading buffer section 20, and forms discharge holes 3b of a predetermined size while pressing down on the gas pocket section 3a via the hole processing unit 51 of the hole processing section 50 that has been transferred to the battery cells 3.

[0061] As described above, a discharge hole 3b is formed in the gas pocket portion 3a of the partially expanded battery cell 3 to discharge the gas inside the battery cell 3, and the discharged gas is discharged to the outside via a gas discharge unit (not shown) provided on the formation device 1.

[0062] The battery cells 3, from which gas has been discharged through the discharge holes 3b formed in the gas pocket section 3a via the hole processing section 50 in the loading buffer section 20, are transferred again to the charging section 10, where the battery cells 3 undergo residual charging.

[0063] During this time, the gas generated inside the battery cell 3 during residual charging is discharged through the discharge hole 3b pre-formed in the gas pocket portion 3a while residual charging is performed.

[0064] The battery cells 3, whose remaining charge has been completed via the charging unit 10, are transferred to the unloading buffer unit 30. The battery cells 3 transferred to the unloading buffer unit 30 are sealed by sealing the discharge hole 3b via the sealing unit 71 of the sealing unit 70 provided on one side of the unloading buffer unit 30, and the sealed battery cells 3 are then discharged.

[0065] On the other hand, as shown in Figure 3, a separate hole processing buffer section 80 is further included on the charging section 10, and a hole processing section 50' is provided on one side of the hole processing buffer section 80. This describes a formation method using a pouch-type battery cell formation device 1'.

[0066] At this time, the partially charged battery cells 3 are transferred to the hole processing buffer section 80 via the charging section 10, and then discharge holes 3b are formed in the battery cells 3 transferred to the hole processing buffer section 80.

[0067] Specifically, the manufactured pouch-type battery cells 3 are supplied to the loading buffer unit 20, and the battery cells 3 supplied to the loading buffer unit 20 are transferred to the charging unit 10 for charging and discharging.

[0068] The battery cell 3 supplied to the charging unit 10 is partially charged, generating gas inside the battery cell 3 and partially expanding the gas pocket 3a.

[0069] In this manner, the battery cell 3 is partially charged via the charging unit 10 to partially expand the gas pocket portion 3a, and then the battery cell 3 with the partially expanded gas pocket portion 3a is transferred to the hole processing buffer portion 80 located on the charging unit 10.

[0070] The battery cells 3, which are transferred to and arranged in the hole processing buffer section 80, form discharge holes 3b in the partially expanded gas pocket section 3a via the hole processing section 50' provided on one side of the hole processing buffer section 80.

[0071] At this time as well, the hole processing unit 50' moves toward the battery cells 3 that have been transferred to and arranged in the hole processing buffer unit 80, and forms an exhaust hole 3b of a predetermined size while pressing down on the gas pocket portion 3a via the hole processing unit 51' of the hole processing unit 50' that has been transferred to the battery cells 3.

[0072] In this way, a discharge hole 3b is formed in the gas pocket portion 3a of the partially expanded battery cell 3 to discharge the gas inside the battery cell 3, and the discharged gas is discharged to the outside via a gas discharge unit (not shown) provided on the formation device 1'.

[0073] The battery cells 3, from which gas has been discharged through the discharge holes 3b formed via the hole processing section 50' in the hole processing buffer section 80, are again transferred to the charging section 10, where the battery cells 3 undergo residual charging.

[0074] The battery cells 3, whose remaining charge has been completed via the charging unit 10, are transferred to the unloading buffer unit 30. The battery cells 3 transferred to the unloading buffer unit 30 are sealed by sealing the discharge hole 3b via a sealing unit 70 provided on one side of the unloading buffer unit 30, and the sealed battery cells 3 are then discharged.

[0075] When performing the formation process via a pouch-type battery cell formation device with the above configuration, a hole processing buffer section 80 is provided on the charging section 10, and a hole processing section 50' for forming discharge holes 3b is provided on one side of the hole processing buffer section 80. Compared to a formation device in which the hole processing section 50' is provided on one side of the loading buffer section 20, the transfer distance of the battery cell 3 can be shortened, thereby reducing the overall process time.

[0076] Here, the hole processing section 50' provided on one side of the hole processing buffer section 80 may have multiple hole processing units 51' that form discharge holes 3b in the gas pocket section 3a of the battery cell 3, corresponding to the battery cells 3 arranged in the charging section 10. In this case, after all the hole processing units 51' of the hole processing section 50' have moved toward the battery cells 3, discharge holes 3b may be formed simultaneously for all the battery cells 3 arranged in the charging section 10.

[0077] In this manner, the hole processing section 50' provided on one side of the hole processing buffer section 80 moves forward toward the battery cells 3 housed in the hole processing buffer section 80, forms discharge holes 3b in the gas pockets 3a of all the battery cells 3 arranged in the hole processing buffer section 80, and then moves backward again to return to its original position.

[0078] On the other hand, when a single hole processing unit 51' is formed in the hole processing section 50', the hole processing unit 51' can sequentially form discharge holes 3b in the battery cells 3 arranged in the hole processing buffer section 80 while moving forward and backward toward the battery cell 3 and sliding in the thickness direction of the battery cell 3.

[0079] On the other hand, as shown in Figure 4, a formation method for pouch-type battery cells using a formation device 1'' is described, in which a hole processing unit 50'' for forming discharge holes 3b in the gas pocket portion 3a of the battery cell 3 is provided on one side of the charging portion 10.

[0080] In this case, both the process of charging the battery cell 3 and the process of forming discharge holes 3b in the gas pocket portion 3a of the battery cell 3 can be performed in the charging unit 10, thus improving the convenience of the process and shortening the process time.

[0081] Specifically, the manufactured battery cells 3 are supplied to the loading buffer unit 20, and the battery cells 3 supplied to the loading buffer unit 20 are transferred to the charging unit 10 for charging and discharging.

[0082] The battery cells 3, transferred to the charging unit 10, undergo partial charging, generating gas inside the battery cells 3 and partially expanding the gas pocket portion 3a.

[0083] In this manner, after partially charging the battery cell 3 via the charging unit 10 and partially expanding the gas pocket portion 3a, the hole processing unit 50'' provided on one side of the charging unit 10 moves so that the gas pocket portion 3a faces the partially expanded battery cell 3, and a discharge hole 3b is formed in the partially expanded gas pocket portion 3a via the hole processing unit 50''.

[0084] In other words, the hole processing unit 50'' moves toward the battery cell 3 which has been partially charged on the charging unit 10, and after pressing the gas pocket portion 3a through the hole processing unit 51'' of the hole processing unit 50'' which has moved toward the battery cell 3, it forms the discharge hole 3b.

[0085] At this time, when forming an exhaust hole 3b in the gas pocket portion 3a of the battery cell 3 via the hole processing portion 50'', the charging portion 10 may temporarily stop charging the battery cell 3.

[0086] In this way, the battery cell 3, from which gas has been discharged through the discharge hole 3b formed in the gas pocket portion 3a, is again charged by the charging unit 10, and the internal gas generated during residual charging is discharged through the discharge hole 3b formed in the gas pocket portion 3a while residual charging is performed.

[0087] The battery cells 3 are transferred to the unloading buffer unit 30 via the charging unit 10. The battery cells 3 transferred to the unloading buffer unit 30 are sealed by sealing the discharge hole 3b via a sealing unit 70 provided on one side of the unloading buffer unit 30, and the sealed battery cells 3 are then discharged.

[0088] When performing the formation process using the pouch-type battery cell formation device 1 configured as described above, the provision of a hole processing unit 50'' for forming discharge holes 3b on the charging unit 10 reduces the battery cell transfer process and dramatically shortens the process time.

[0089] In this way, by partially charging to partially expand the gas pocket portion 3a, forming an exhaust hole 3b in the partially expanded gas pocket portion 3a to discharge only the gas, and then performing residual charging again, it is possible to prevent the gas and electrolyte from being discharged together through the exhaust hole 3b due to excessive expansion of the gas pocket portion 3a during charging of the existing battery cell 3, thereby preventing contamination of the formation device by the electrolyte.

[0090] In other words, conventionally, when the electrolyte is injected into the pouch-type battery cell 3 during the assembly stage, it is injected under vacuum conditions, and then the electrolyte is discharged along with the internal gas of the pouch battery cell 3 when the discharge hole 3b is formed, due to the vacuum-sealed portion of the gas pocket 3a and the internal pressure. However, by partially charging the battery cell 3 with the formation method according to the present invention and partially expanding the gas pocket 3a, the internal pressure of the battery cell 3 can be set to a constant level, making it possible to stably discharge only the gas excluding the electrolyte.

[0091] (Second Embodiment) In another embodiment of the present invention, partial charging via the charging unit may be performed until the portion of the battery cell that is in vacuum contact with the gas pocket separates from the battery cell.

[0092] In other words, when forming discharge holes in existing battery cells, in order to prevent both gas and electrolyte from being discharged along the portion that is in vacuum contact with the gas pocket portion of the battery cell, partial charging can be performed until the portions that are in vacuum contact with the gas pocket portion of the battery cell separate from each other at a certain distance, and then discharge holes can be formed in the gas pocket portion of the partially charged battery cell.

[0093] As described above, by allowing the vacuum-sealed portion of the gas pocket to separate and expand, it is possible to prevent both the internal gas and electrolyte from being discharged due to the internal pressure when forming the discharge hole in the gas pocket.

[0094] In this embodiment, partial charging is performed until the portion of the battery cell that is in vacuum contact with the gas pocket separates from it. However, partial charging can also be performed until the gas pocket expands to a predetermined size.

[0095] In other words, charging can only be performed until the gas pocket expands to a predetermined size compared to the standard expansion size of the gas pocket when the battery cell is fully charged.

[0096] Thus, in existing designs, when the electrolyte is injected into the pouch-type battery cell during the assembly stage, it is injected under vacuum conditions, and then the internal gas and electrolyte of the pouch battery cell can be discharged together when the discharge hole is formed due to the vacuum-sealed portion of the gas pocket and the internal pressure. However, in this embodiment, by partially charging the battery cell to separate the vacuum-sealed portions of the gas pocket from each other, or by expanding the gas pocket to a predetermined size, only the gas excluding the electrolyte can be stably discharged.

[0097] Here, the size of the gas pocket can be set to expand to about 1 / 3 to 2 / 3 of the size of the gas pocket expanded by the gas generated inside the battery cell when it is fully charged, but is not limited to this.

[0098] In this case, the system may further include a separate sensing sensor for detecting the size of the gas pocket, or a vision device capable of capturing images to compare and analyze the size of the gas pocket.

[0099] On the other hand, when partially charging a battery cell, it is also possible to set a charging time and then partially charge the battery during the set time to partially expand the gas pocket, separate the vacuum-sealed portion of the gas pocket, or expand the gas pocket to a predetermined size to form an exhaust hole in the gas pocket, thereby stably exhausting only the gas without exhausting the electrolyte. However, this is not limited to these methods, and a variety of other modifications can be implemented.

[0100] Although the present invention has been illustrated and described in relation to specific embodiments, it is readily apparent to anyone with ordinary skill in the art that various modifications and changes are possible without departing from the spirit and scope of the invention as set forth in the claims. [Explanation of Symbols]

[0101] 1, 1', 1'': Formation device for pouch-type battery cells 3: Battery cell 3a: Gas pocket area 3b: Discharge hole 10:Charging part 20: Loading buffer section 30: Unloading buffer section 50, 50', 50'': Hole machining section 51, 51', 51'' Hole processing unit 70: Sealing section 80: Hole processing buffer section 90: Loader / Unloader

Claims

1. In a method for arranging pouch-type battery cells, A first charging stage in which the pouch-type battery cell is charged in the charging unit, A hole processing step in which a discharge hole is formed in the gas pocket portion of the charged pouch-type battery cell, A gas discharge step in which internal gas generated during charging is discharged through the aforementioned discharge hole, A sealing step in which the aforementioned discharge hole is sealed, A method for arranging pouch-type battery cells, including [the specified element].

2. The method for forming a pouch-type battery cell according to claim 1, further comprising a second charging step of charging the pouch-type battery cell after a gas discharge step of discharging the internal gas through the discharge hole formed in the gas pocket portion.

3. The first charging stage is, The method for forming a pouch-type battery cell according to claim 2, comprising partially charging the pouch-type battery cell and generating gas inside the pouch-type battery cell to partially expand the gas pocket portion.

4. The aforementioned partial charging is The method for arranging pouch-type battery cells according to claim 3, wherein the pouch-type battery cells are charged until they are not fully charged.

5. The aforementioned partial charging is The method for arranging pouch-type battery cells according to claim 4, wherein the pouch-type battery cells are charged to 50% or less of their total charge capacity.

6. The aforementioned partial charging is The method for forming a pouch-type battery cell according to claim 3, wherein the battery cell is charged until the portion of the pouch-type battery cell that is in vacuum contact with the gas pocket separates from the battery cell.

7. The method for forming a pouch-type battery cell according to claim 2, wherein after performing the first charging step on the pouch-type battery cell, the discharge hole is formed in the partially expanded gas pocket to discharge the internal gas.

8. The second charging stage is, A method for arranging pouch-type battery cells according to claim 7, wherein residual charging is performed after the gas is discharged through the discharge hole in the gas pocket portion.

9. The remaining charge is, A method for arranging a pouch-type battery cell according to claim 8, wherein the battery is charged while the gas is discharged through the discharge hole in the gas pocket portion.

10. The remaining charge is, The method for arranging pouch-type battery cells according to claim 8, wherein the pouch-type battery cells are charged until they are not fully charged.

11. The remaining charge is, The method for arranging pouch-type battery cells according to claim 10, wherein the pouch-type battery cells are charged to 70% of their total charge capacity.

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