Formation method for bag-type single battery

Abstract

The disclosed invention is a method for forming a battery cell by using a forming apparatus for a pouch-type battery cell, the method comprising: a first charging step of charging the battery cell by a charging unit; a hole processing step of forming a discharge hole in the airbag portion of the charged battery cell; a gas discharge step of discharging internal gas generated during charging through the discharge hole; and a sealing step of sealing the discharge hole.

Description

Technical Field

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

[0002] More particularly, the present invention relates to a formation method for a pouch-type battery cell, which prevents electrolyte from being discharged together with gas generated during a formation process of the battery cell and prevents external contamination caused thereby.

[0003] This application claims priority to Korean Patent Application No. 10-2022-0113041, filed on September 6, 2022, the disclosure of which is incorporated herein by reference in its entirety. Background Art

[0004] Generally, secondary batteries can be classified into cylindrical, prismatic, or pouch types according to their shapes. Among them, pouch-type secondary batteries have received a lot of attention because they use a pouch exterior material consisting of a multilayer film of a metal layer (foil) and a synthetic resin coated on the upper and lower surfaces of the metal layer to form the exterior, which can significantly reduce the weight of the battery compared to a cylindrical or prismatic type using a metal can, thereby making the battery lightweight, and have the advantage of being able to be changed into various shapes.

[0005] The electrode assembly is stored in these pouch-type secondary batteries in a stacked shape, having electrode tabs and electrode leads connected thereto, wherein the electrode leads protrude from the pouch outer material. These electrode leads are electrically connected by contact with an external device to receive power from the external device.

[0006] The pouch-type secondary battery is manufactured by assembling the cells and activating the battery, and in the battery activation step, the secondary battery cells are mounted on a charging and discharging device and charged and discharged to the conditions required for activation. In this way, the process of performing predetermined charging and discharging using a charging and discharging device to activate the battery is called a formation process.

[0007] During the formation process, both surfaces of the battery cell may be pressurized using a pressurizing device such as a clamp, which includes a flat pressure plate during activation charging and is sometimes referred to as clamp formation.

[0008] The clamp formation as described above can prevent the negative electrode from expanding during the activation process, promote the chemical reaction of the battery to cause gas generation, and the generated internal gas is transferred to the airbag part.

[0009] In this case, the electrode assembly is stored in a pouch, an electrolyte is injected and sealed, and during a formation process, gas is generated due to a chemical reaction of the electrolyte and the electrode, which causes an airbag portion of the pouch type secondary battery to expand.

[0010] If the airbag portion is over-inflated, interference and collision with the conveying device may occur when removing the battery cells from the jig formation equipment, interference between battery cells during the conveying process may cause poor appearance of the battery cells, and too many bags are required to create sufficient internal space for the airbag portion.

[0011] In order to solve the above problem, during the formation process of the battery cell, a discharge hole is formed in the air bag portion of the battery cell to discharge the gas generated during charging to the outside.

[0012] However, forming the discharge hole in the air bag portion of the battery cell has a problem in that when the gas is discharged, electrolyte is discharged along with the gas due to an increase in the internal pressure of the battery cell, thereby contaminating the outside and causing a safety accident.

[0013] [Prior art literature]

[0014] Korean Patent Publication No.10-2013-0024807 Summary of the invention

[0015] [Technical issues]

[0016] The present invention is made to solve the above-mentioned problems, and aims to provide a formation method for a pouch-type battery cell, wherein the pouch-type battery cell is partially charged to generate gas during the formation process, partially expanded so that the vacuum-tight parts of the airbag part are spaced apart from each other, and then a discharge hole is formed in the partially expanded airbag part so that only the internal gas can be discharged to the outside without discharging the electrolyte, and stable charging and discharging can be achieved by naturally discharging the internal gas generated in the process while performing residual charging on the battery cell that discharges the gas.

[0017] Furthermore, the present invention aims to provide a formation method for a pouch-type battery cell that prevents electrolyte from being discharged along with the gas, thereby preventing pollution of the surrounding environment, by discharging only the internal gas generated from the battery cell during the formation process.

[0018] [Technical solution]

[0019] In order to achieve the above problem, the present invention provides a formation method of a battery cell, comprising: a first charging step of charging the battery cell in a charging part; a hole processing step of forming a discharge hole in the air bag part of the charged battery cell; a gas discharge step of discharging the internal gas generated during charging through the discharge hole; and a sealing step of sealing the discharge hole.

[0020] As an exemplary embodiment, a second charging step of charging the battery cell after the gas exhausting step in which the internal gas is exhausted through the exhaust hole formed in the air bag portion may be further included.

[0021] As another exemplary embodiment, the first charging step may perform partial charging on the battery cells to generate gas inside the battery cells to partially inflate the airbag portion.

[0022] As a specific exemplary embodiment, the partial charging may charge the battery cell before the battery cell is fully charged.

[0023] As another specific exemplary embodiment, the partial charging may charge the battery cell at 50% or less of its total charging capacity.

[0024] As an exemplary embodiment, the partial charging may be charged to the extent that the vacuum-tight portion of the airbag portion of the battery cell is spaced apart.

[0025] As another exemplary embodiment, after performing the first charging step on the battery cell, a discharge hole may be formed in the partially inflated airbag portion to discharge internal gas.

[0026] As an exemplary embodiment, the second charging step may perform residual charging after exhausting the gas through the exhaust hole of the airbag portion.

[0027] As a specific exemplary embodiment, the remaining charge may be charged while exhausting gas through the exhaust hole of the airbag portion.

[0028] As another specific exemplary embodiment, the remaining charge may charge the battery cell before the battery cell is fully charged.

[0029] As another specific exemplary embodiment, the remaining charge may charge the battery cells to 70% of their total charge capacity.

[0030] [Beneficial Effects]

[0031] According to the present invention, by performing partial charging on the pouch-type battery cell to partially expand the airbag part, the vacuum-tight parts of the airbag part are spaced apart from each other to ensure that the airbag part does not over-expand, and the electrolyte can be prevented from being discharged when the discharge hole is formed in the airbag part, and only the internal gas is stably discharged.

[0032] Furthermore, by performing partial and residual charging on the battery cell before and after forming the exhaust hole in the air bag portion of the battery cell during the formation process, only the internal gas can be exhausted through the exhaust hole, and the internal gas can be stably exhausted without exhausting the electrolyte to prevent surrounding contamination. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a flowchart illustrating a formation method of a pouch-type battery cell according to an exemplary embodiment of the present invention.

[0034] Figure 2 1 is a diagram schematically showing an exemplary embodiment of a pouch-type battery cell formation device to explain a formation method of a pouch-type battery cell according to the present invention.

[0035] Figure 3 2 is a diagram schematically showing another exemplary embodiment of a pouch-type battery cell formation apparatus to explain a formation method of a pouch-type battery cell according to the present invention.

[0036] Figure 4 2 is a diagram schematically showing another exemplary embodiment of a pouch-type battery cell formation apparatus to explain a formation method of a pouch-type battery cell according to the present invention. DETAILED DESCRIPTION

[0037] The following is a detailed description of the present invention. It should be noted that the terms or words used in this specification and the claims of this patent should not be interpreted in their ordinary or dictionary meanings, but should be interpreted in a meaning and concept consistent with the technical concept of the present invention on the basis of the principle that the inventor can appropriately define the concept of the term to best describe his invention.

[0038] The terms "comprises," "includes," and "having" are used herein to indicate the presence of features, numbers, steps, actions, parts, or components, or a combination thereof, described in the specification, and it should be understood that the possibility of the presence or addition of one or more other features, numbers, steps, actions, parts, components, or a combination thereof is not excluded in advance.

[0039] Furthermore, when a portion of a layer, film, region, or plate is disposed “on” another portion, this includes not only a case where one portion is disposed “directly” “on” another portion, but also a case where a third portion is interposed therebetween. Conversely, when a portion of a layer, film, region, or plate is disposed “below” another portion, this includes not only a case where one portion is disposed “directly” “below” another portion, but also a case where a third portion is interposed therebetween. Furthermore, in the present application, “on” may include not only a case where it is disposed on an upper portion, but also a case where it is disposed on a lower portion.

[0040] Furthermore, when a portion of a layer, film, region, or plate is disposed “on” another portion, this includes not only a case where one portion is disposed “directly on” another portion, but also a case where a third portion is inserted therebetween. Conversely, when a portion of a layer, film, region, or plate is disposed “below” another portion, this includes not only a case where one portion is disposed “directly below” another portion, but also a case where a third portion is inserted therebetween. Furthermore, in the present application, “on” may include not only a housing disposed on the upper portion, but also a housing disposed on the lower portion.

[0041] (First embodiment)

[0042] Figure 1 is a flowchart illustrating a formation method of a pouch-type battery cell according to an exemplary embodiment of the present invention. Figure 2 1 is a diagram schematically showing an exemplary embodiment of a pouch-type battery cell formation device to explain a formation method of a pouch-type battery cell according to the present invention. Figure 3 2 is a diagram schematically showing another exemplary embodiment of a pouch-type battery cell formation apparatus to explain a formation method of a pouch-type battery cell according to the present invention. Figure 4 2 is a diagram schematically showing another exemplary embodiment of a pouch-type battery cell formation apparatus to explain a formation method of a pouch-type battery cell according to the present invention.

[0043] like Figure 1 As shown, the formation method of a battery cell according to an exemplary embodiment of the present invention includes: a first charging step S10 for charging the battery cell at a charging portion; a hole processing step S30 for forming a discharge hole in the air bag portion of the charged battery cell; a gas discharge step S50 for discharging internal gas generated during charging through the discharge hole; and a sealing step S70 for sealing the discharge hole.

[0044] Specifically, the present invention is a formation method for performing predetermined charging and discharging on a battery cell to activate the battery cell, which performs a first charging step S10 as a condition required to swell a plurality of battery cells arranged in a charging section.

[0045] Here, the battery cells arranged in the charging part may be charged sequentially, or all the battery cells arranged in the charging part may be charged simultaneously.

[0046] The first charging step performs partial charging on the battery cells to generate gas inside the battery cells, thereby partially inflating the airbag portion.

[0047] In other words, the first charging step performs partial charging on the battery cell to generate gas due to a chemical reaction of an electrolyte and an electrode inside the battery cell, which partially expands an airbag portion of the battery cell.

[0048] Here, the partial charging may be configured to charge the battery cells before the full charging.

[0049] In this manner, by charging the battery cell before the battery cell is fully charged, it is possible to prevent the air bag portion in the formation process of the conventional battery cell from being excessively expanded due to the gas generated when the battery cell is fully charged.

[0050] In this case, the partial charge may be configured to charge the battery cell to less than or equal to 50% of the total charge capacity of the battery cell.

[0051] In this way, by charging the battery cell to 50% or less of its total charge capacity, the gas generated inside the battery cell can be regulated to a predetermined amount, and the pressure inside the battery cell can be controlled by partially inflating the airbag portion to prevent the airbag portion from over-inflating.

[0052] Preferably, the partial charge may not exceed 5% to 50% of the total charge capacity of the battery cell.

[0053] The hole processing step S30 is performed to form a discharge hole in the airbag portion of the battery cell that has been charged through the first charging step S30.

[0054] Then, the gas inside the battery cell is exhausted through the exhaust hole formed in the air bag portion of the battery cell through the hole processing step S50.

[0055] Here, after the first charging step is performed on the battery cell, a discharge hole is formed in the partially inflated airbag portion, and the internal gas is discharged through the discharge hole in the partially inflated airbag portion.

[0056] As described above, by partially charging the battery cell and partially expanding the airbag portion so that the airbag portion is not over-inflated, and then forming a discharge hole in the airbag portion, it is possible to prevent the electrolyte from being discharged to the outside of the battery cell due to a capillary phenomenon caused by an increase in the internal pressure of the battery cell when the gas is discharged through the discharge hole, and only the internal gas can be discharged without the electrolyte being discharged.

[0057] Here, the method may further include a second charging step S60 in which the battery cells are charged after the gas exhaust step in which the internal gas is exhausted through the exhaust hole formed in the airbag part.

[0058] At this time, the second charging step may perform residual charging after the gas is discharged through the discharge hole of the airbag portion.

[0059] The remaining charge may be configured to perform charging while exhausting gas through the exhaust hole in the airbag portion.

[0060] As described above, by partially charging the battery cell to partially expand the airbag portion, and then forming a discharge hole in the partially expanded airbag portion to discharge the gas generated inside the battery cell once, and then residually charging the battery cell after the internal gas generated by the partial charging is discharged, the residual charging can be stably performed while the gas generated during the residual charging is secondary discharged, thereby fundamentally preventing the external discharge of the electrolyte injected into the battery cell under vacuum.

[0061] Here, the residual charge may charge the battery cell before the battery cell is fully charged, preferably up to 70% of the total charge capacity of the battery cell.

[0062] Hereinafter, a formation method of a pouch-type battery cell according to an exemplary embodiment of the present invention will be described in more detail together with a pouch-type battery cell formation apparatus.

[0063] First, if Figure 2 As shown, the formation method of the pouch-type battery cell is described below by means of a formation device 1, which includes: a charging part 10, which is used to charge the battery cell 3; and a loading buffer part 20, in which the battery cell 3 waits before being inserted into the charging part 10, wherein the battery cell 3 is retrieved by the loader / unloader 90; an unloading buffer part 30, in which the battery cell 3 that has been charged and retrieved from the charging part 10 waits; and a hole processing part 50, which is arranged on one side of the loading buffer part 20 to form a discharge hole 3b in the air bag part 3a of the battery cell 3 accommodated in the loading buffer part 20; and a sealing part 70, which is arranged on one side of the unloading buffer part 30 to seal the discharge hole 3b formed in the air bag part 3a of the battery cell 3 accommodated in the unloading buffer part 30.

[0064] The pouch-type battery cell 3 is manufactured by storing a laminate including a positive electrode, a separator, and a negative electrode in a pouch, sealing it, and injecting an electrolyte into the pouch under vacuum.

[0065] The manufactured battery cells 3 are supplied to the loading buffer part 20 , and the battery cells 3 supplied to the loading buffer part 20 are transferred to the charging part 10 to perform charging and discharging.

[0066] The battery cells 3 supplied to the charging portion 10 perform predetermined charging and discharging using a charging and discharging device (not shown) provided in the charging portion 10 to activate the battery.

[0067] Specifically, partial charging is performed on the battery cells 3 supplied to the charging portion 10 to generate gas inside the battery cells 3 , thereby partially expanding the airbag portion 3 a .

[0068] In this way, the battery cell 3 is partially charged by the charging part 10 to partially expand the air bag part 3 a, and the battery cell 3 having the partially expanded air bag part 3 a is transferred to the loading buffer part 20 .

[0069] The battery cell 3 transferred to and arranged in the loading buffer part 20 forms the discharge hole 3b in the partially expanded airbag part 3a by the hole processing part 50 provided on one side of the loading buffer part 20. In other words, the hole processing part 50 moves toward the battery cell 3 transferred and arranged in the loading buffer part 20, and the hole processing unit 51 of the hole processing part 50 transferred to the battery cell 3 forms the discharge hole 3b having a predetermined size while pressing the airbag part 3a.

[0070] As described above, the exhaust hole 3 b is formed in the air bag portion 3 a of the partially expanded battery cell 3 to exhaust the gas inside the battery cell 3 , and the exhausted gas is exhausted to the outside through a gas exhaust portion (not shown) provided on the formation device 1 .

[0071] In the loading buffer part 20 , the battery cells 3 from which gas has been discharged through the discharge holes 3 b formed in the airbag part 3 a via the hole processing part 50 are transferred back to the charging part 10 , and the battery cells 3 transferred to the charging part 10 perform residual charging.

[0072] At this time, the gas generated inside the battery cell 3 during the residual charge is discharged through the discharge hole 3b formed in the air bag portion 3a to perform the residual charge.

[0073] The battery cells 3 that have completed the remaining charge through the charging part 10 are transferred to the unloading buffer part 30, and the battery cells 3 transferred to the unloading buffer part 30 are sealed by sealing the discharge holes 3b through the sealing unit 71 of the sealing part 70 provided on one side of the unloading buffer part 30, and the sealed battery cells 3 are discharged.

[0074] At the same time, if Figure 3 As shown, a formation method of a pouch-type battery cell using a formation device 1 ′ is described, the formation device 1 ′ further comprising a separate hole processing buffer portion 80 on the charging portion 10 , and a hole processing portion 50 ′ is provided on one side of the hole processing buffer portion 80 .

[0075] In this case, the battery cells 3 partially charged by the charging part 10 are transferred to the hole processing buffer part 80 , and then the discharge holes 3 b are formed with respect to the battery cells 3 transferred to the hole processing buffer part 80 .

[0076] Specifically, the manufactured pouch type battery cells 3 are supplied to the loading buffer part 20 , and the battery cells 3 supplied to the loading buffer part 20 are transferred to the charging part 10 to be charged and discharged.

[0077] Partial charging is performed on the battery cells 3 supplied to the charging portion 10 to generate gas inside the battery cells 3 , thereby partially expanding the airbag portion 3 a .

[0078] In this way, the battery cell 3 is partially charged by the charging part 10 to partially expand the airbag part 3 a, and then the battery cell 3 after the partial expansion of the airbag part 3 a is transferred to the hole processing buffer part 80 placed on the charging part 10 .

[0079] The battery cell 3 transferred to and arranged in the hole processing buffer part 80 forms the discharge hole 3 b in the partially inflated airbag part 3 a through the hole processing part 50 ′ provided on one side of the hole processing buffer part 80 .

[0080] At this time, the hole processing part 50' moves toward the battery cell 3 transferred to the hole processing buffer part 80 and arranged, and presses the airbag part 3a by the hole processing unit 51' of the hole processing part 50' transferred to the battery cell 3 to form the discharge hole 3b having a predetermined size.

[0081] Thus, the exhaust hole 3 b is formed in the air bag portion 3 a of the partially expanded battery cell 3 to exhaust the gas inside the battery cell 3 , and the exhausted gas is exhausted to the outside through a gas exhaust portion (not shown) provided on the formation device 1 ′.

[0082] In the hole processing buffer part 80 , the battery cells 3 from which the gas is discharged through the discharge holes 3 b formed through the hole processing part 50 ′ are transferred back to the charging part 10 , and the battery cells 3 transferred to the charging part 10 perform the remaining charge.

[0083] The battery cells 3 that have completed the remaining charge through the charging part 10 are transferred to the unloading buffer part 30, and the battery cells 3 transferred to the unloading buffer part 30 are sealed by sealing the discharge holes 3b by the sealing part 70 provided on one side of the unloading buffer part 30, and the sealed battery cells 3 are discharged.

[0084] Using the formation device of the pouch-type battery cell constructed as described above, when performing the formation process, a hole processing buffer part 80 is set on the charging part 10, and a hole processing part 50' for forming the discharge hole 3b is set on one side of the hole processing buffer part 80, so that compared with the formation device in which the hole processing part 50' is set on one side of the loading buffer part 20, the conveying distance of the battery cell 3 can be shortened and the overall process time can be reduced.

[0085] Here, the hole processing portion 50' provided on one side of the hole processing buffer portion 80 may be formed with a plurality of hole processing units 51' corresponding to the battery cells 3 arranged in the charging portion 10, and the plurality of hole processing units 51' form the discharge holes 3b in the airbag portion 3a of the battery cells 3. In this case, all the hole processing units 51' of the hole processing portion 50' may be configured to move toward the battery cells 3 and then simultaneously form the discharge holes 3b for all the battery cells 3 arranged in the charging portion 10.

[0086] In this way, the hole processing portion 50' provided on one side of the hole processing buffer portion 80 is configured to move forward toward the battery cells 3 accommodated in the hole processing buffer portion 80 to form the discharge holes 3b in the airbag portions 3a of all the battery cells 3 arranged in the hole processing buffer portion 80, and then move backward to return to its original position.

[0087] At the same time, when the hole processing unit 51' in the hole processing part 50' is formed as one, the discharge holes 3b can be sequentially formed for the battery cells 3 arranged in the hole processing buffer part 80, while the hole processing unit 51' moves forward and backward toward the battery cells 3 and slides in the thickness direction of the battery cells 3.

[0088] At the same time, if Figure 4 As shown, a formation method of a pouch-type battery cell by means of a formation device 1 ″ is described, wherein a hole processing part 50 ″ for forming a discharge hole 3 b in an air bag part 3 a of a battery cell 3 is provided on one side of a charging part 10 .

[0089] In this case, both the process of charging the battery cell 3 and the process of forming the discharge hole 3b in the airbag portion 3a of the battery cell 3 may be performed in the charging portion 10, thereby improving the convenience of the process and reducing the process time.

[0090] Specifically, the manufactured battery cells 3 are supplied to the loading buffer part 20 , and the battery cells 3 supplied to the loading buffer part 20 are transferred to the charging part 10 to perform charging and discharging.

[0091] The battery cell 3 transferred to the charging portion 10 performs partial charging, and gas is generated inside the battery cell 3 to partially expand the airbag portion 3 a.

[0092] In this way, after the battery cell 3 is partially charged by the charging part 10 to partially expand the airbag part 3a, the hole processing part 50'' set on one side of the charging part 10 is moved so that the airbag part 3a faces the partially expanded battery cell 3, and the discharge hole 3b is formed in the partially expanded airbag part 3a through the hole processing part 50''.

[0093] That is, the hole processing part 50 ″ moves toward the partially charged battery cell 3 on the charging part 10 , and the airbag part 3 a is pressed by the hole processing unit 51 ″ of the hole processing part 50 ″ moving toward the battery cell 3 to form the discharge hole 3 b.

[0094] Here, when the discharge hole 3 b is formed in the airbag portion 3 a of the battery cell 3 through the hole processing portion 50 ″, the charging portion 10 may temporarily stop charging the battery cell 3 .

[0095] In this way, the battery cell 3 from which the gas is discharged through the discharge hole 3b formed in the airbag portion 3a performs residual charging again in the charging portion 10, and the internal gas generated during the residual charging is discharged through the discharge hole 3b formed in the airbag portion 3a while performing the residual charging.

[0096] The battery cell 3 is transferred to the unloading buffer part 30 through the charging part 10, and the battery cell 3 transferred to the unloading buffer part 30 is sealed by sealing the discharge hole 3b by the sealing part 70 provided on one side of the unloading buffer part 30, and the sealed battery cell 3 is discharged.

[0097] When the formation process is performed by the formation apparatus 1 of the pouch type battery cell constructed as above, the hole processing part 50 ″ for forming the discharge hole 3 b is provided on the charging part 10 , so that the transfer process of the battery cell 3 can be reduced, thereby significantly shortening the process time.

[0098] In this way, by performing partial charging to partially expand the airbag portion 3a, forming a discharge hole 3b in the partially expanded airbag portion 3a to discharge only the gas, and then performing the remaining charge again, it is possible to prevent the gas inside the battery cell 3 from being discharged through the discharge hole 3b together with the electrolyte due to excessive expansion of the airbag portion 3a when charging the conventional battery cell 3, and to prevent the electrolyte from contaminating the formation device.

[0099] In other words, conventionally, when the electrolyte is injected into the pouch-type battery cell 3 in the assembly stage, the electrolyte is discharged together with the internal gas of the pouch-type battery cell 3 when the airbag portion 3a is formed due to the vacuum-tight portion and internal pressure of the airbag portion 3a, but by partially charging the battery cell 3 using the formation method according to the present invention to partially expand the airbag portion 3a, the internal pressure of the battery cell 3 can be formed to a certain size so that only gases other than the electrolyte can be stably discharged.

[0100] (Second embodiment)

[0101] In other exemplary embodiments of the present invention, the partial charging via the charging portion may be configured to charge to the extent that the vacuum-tight portions of the airbag portion of the battery cell are spaced apart.

[0102] In other words, in order to prevent gas and electrolyte from being discharged together along the vacuum-tight portion of the airbag portion of the battery cell when a discharge hole is formed in the battery cell, partial charging can be performed to the extent that the vacuum-tight portion of the airbag portion of the battery cell is spaced apart by a specified distance, and then a discharge hole can be formed in the airbag portion of the partially charged battery cell.

[0103] As described above, by partitioning the vacuum-tight portion of the bladder portion, it is possible to prevent the internal gas and electrolyte from being discharged together due to the internal pressure when the discharge hole is formed in the bladder portion.

[0104] In this embodiment, the partial charging is configured to charge to the extent that the vacuum-tight portions of the airbag portion of the battery cell are spaced apart, but the partial charging may also be configured to charge to the extent that the airbag portion is expanded to a predetermined size.

[0105] That is, when the battery cell is fully charged, charging can be performed only to the extent that the airbag portion is expanded to a predetermined size with respect to a reference expanded size of the airbag portion.

[0106] Therefore, conventionally, after the electrolyte is injected into the pouch-type battery cell during the assembly stage, the internal gas and the electrolyte of the pouch-type battery cell can be discharged together when the discharge hole is formed in the vacuum-tight part of the airbag part due to the internal pressure, but in this embodiment, only the gas other than the electrolyte can be stably discharged by partially charging the battery cell and spacing the vacuum-tight parts of the airbag part from each other or by expanding the airbag part to a predetermined size.

[0107] Here, the set size of the airbag portion may be set to about 1 / 3 to 2 / 3 of the size of the expanded size of the airbag due to gas generated inside the battery cell when the existing battery cell is fully charged, but is not limited thereto.

[0108] At this time, a separate detection sensor for detecting the size of the airbag portion or a visual device for capturing an image to compare and analyze the size of the airbag portion may also be included.

[0109] At the same time, when the battery cell is partially charged, the charging time can be set, and then partial charging can be performed within the set time to partially expand the airbag part so that the vacuum-tight part of the airbag part is separated, or the airbag part is expanded to a predetermined size so that when a discharge hole is formed in the airbag part, only gas can be stably discharged without discharging electrolyte, but is not limited to this, and various other changes can be made.

[0110] While the present invention has been shown and described with reference to certain embodiments, it will be apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the invention as set forth in the following claims.

[0111] [reference numerals]

[0112] 1, 1', 1'': Formation device for pouch-type battery cells

[0113] 3: Battery Cell

[0114] 3a: Airbag part

[0115] 3b: Drain hole

[0116] 10: Charging part

[0117] 20: Loading buffer section

[0118] 30: Unload the buffer part

[0119] 50, 50', 50'': Hole processing part

[0120] 51, 51', 51'': hole processing unit

[0121] 70: Sealing part

[0122] 80: Hole processing buffer part

[0123] 90: Loader / Unloader

Claims

1. In the formation method of battery cells, A formation method for a pouch-type battery cell, comprising: A first charging step is to charge the battery cells in the charging part; a hole processing step of forming a discharge hole in the air bag portion of the charged battery cell; a gas exhaust step of exhausting internal gas generated during charging through the exhaust hole; and A sealing step of sealing the discharge hole.

2. The method for forming a pouch-type battery cell according to claim 1, further comprising: include: A second charging step of charging the battery cell after the gas exhausting step in which the internal gas is exhausted through the exhaust hole formed in the air bag portion.

3. The method for forming a pouch-type battery cell according to claim 2, in, The first charging step performs partial charging on the battery cell to generate gas inside the battery cell to partially expand the airbag portion.

4. The method for forming a pouch-type battery cell according to claim 3, in, The partial charging charges the battery cell before the battery cell is fully charged.

5. The method for forming a pouch-type battery cell according to claim 4, in, The partial charging charges the battery cell at 50% or less of a total charging capacity of the battery cell.

6. The method for forming a pouch-type battery cell according to claim 3, in, The partial charge is charged to an extent that the vacuum-tight portion of the airbag portion of the battery cell is partitioned.

7. The method for forming a pouch-type battery cell according to claim 2, in, After performing the first charging step on the battery cell, the exhaust hole is formed in the partially inflated airbag portion to exhaust the internal gas.

8. The method for forming a pouch-type battery cell according to claim 7, in, The second charging step performs residual charging after exhausting the gas through the exhaust hole of the airbag portion.

9. The method for forming a pouch-type battery cell according to claim 8, in, The remaining charge is charged while exhausting gas through the exhaust hole of the airbag portion.

10. The method for forming a pouch-type battery cell according to claim 8, in, The remaining charge charges the battery cell before the battery cell is fully charged.

11. The method for forming a pouch-type battery cell according to claim 10, in, The remaining charge charges the battery cell to 70% of its total charge capacity.

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