WO2018147549A1 - Method for manufacturing pouch type secondary battery - Google Patents

Method for manufacturing pouch type secondary battery Download PDF

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Publication number
WO2018147549A1
WO2018147549A1 PCT/KR2017/015271 KR2017015271W WO2018147549A1 WO 2018147549 A1 WO2018147549 A1 WO 2018147549A1 KR 2017015271 W KR2017015271 W KR 2017015271W WO 2018147549 A1 WO2018147549 A1 WO 2018147549A1
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WO
WIPO (PCT)
Prior art keywords
pouch
pouch case
method
secondary battery
type secondary
Prior art date
Application number
PCT/KR2017/015271
Other languages
French (fr)
Korean (ko)
Inventor
홍석현
김명현
박효진
배준성
이의경
허진우
Original Assignee
주식회사 엘지화학
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to KR1020170019630A priority Critical patent/KR20180093482A/en
Priority to KR10-2017-0019630 priority
Application filed by 주식회사 엘지화학 filed Critical 주식회사 엘지화학
Publication of WO2018147549A1 publication Critical patent/WO2018147549A1/en

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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/04Construction or manufacture in general
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2/00Constructional details or processes of manufacture of the non-active parts
    • H01M2/02Cases, jackets or wrappings
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2/00Constructional details or processes of manufacture of the non-active parts
    • H01M2/12Vent plugs or other mechanical arrangements for facilitating escape of gases

Abstract

Disclosed is a method for manufacturing a pouch type secondary battery, comprising the steps of: casing an electrode assembly with a pouch case; injecting an electrolyte therein through a part of the pouch case; primarily sealing the pouch case; performing charging/discharging; forming a degas hole in the pouch case; discharging an activated gas to the outside of the pouch case while applying pressure in the direction of the electrode assembly from the outside of the pouch case and vibrating the electrolyte by generating ultrasonic waves; and secondarily sealing the pouch case.

Description

Manufacturing method of pouch type secondary battery

The present invention relates to a method of manufacturing a pouch type secondary battery, and more particularly, to a method of manufacturing a pouch type secondary battery that can improve the discharge efficiency of the gas in the degasing process.

This application is a priority application for Korean Patent Application No. 10-2017-0019630, filed February 13, 2017, and all contents disclosed in the specification and drawings of the application are incorporated herein by reference.

In general, the manufacturing method of the pouch type secondary battery, injecting the electrolyte through the electrolyte injection portion located on one side of the edge region of the prepared pouch-type cell, after the first sealing the electrolyte injection portion along the primary sealing line to charge and discharge Advancing, cutting a portion of the electrolyte injection portion along a cutting line located inside the primary sealing line, performing degassing, secondary sealing the electrolyte injection portion, and positioned outside the secondary sealing line Cutting a portion of the electrolyte injection portion along the cutting line.

In the manufacturing method of the pouch type secondary battery, in the degassing process performed after the activation process through charging and discharging, as shown in FIG. 1, the pouch case ( 2) and pressurizes the cell 1 including the electrode assembly 3 to remove the internal activation gas by moving to the outside through the degas hole (4).

However, the electrode assembly has a problem in that the degassing efficiency is limited because it is difficult to smoothly discharge the activating gas to the outside due to a complicated shape such as a stack and folding structure.

When the pressure of the degas pusher is set excessively high in order to increase the degassing efficiency, a problem of excessive discharge of the electrolyte may occur.

Residual gas, which is not discharged during the degassing process and remains in the cell, increases the resistance of the cell, which causes the quality to be deteriorated.

The present invention has been made in view of the above technical background, and provides a method of manufacturing a pouch type secondary battery that can increase the efficiency of the degassing process of removing the activation gas in the manufacturing process of the pouch type secondary battery. There is this.

In order to achieve the above object, the present invention comprises the steps of (a) casing the electrode assembly to the pouch case; (b) injecting an electrolyte solution through a portion of the pouch case; (c) first sealing the pouch case; (d) charging and discharging; (e) forming a gas hole in the pouch case; (f) discharging an activation gas to the outside of the pouch case while applying ultrasonic pressure from the outside of the pouch case toward the electrode assembly and generating ultrasonic waves to vibrate the electrolyte solution; It provides a method of manufacturing a pouch type secondary battery comprising a; and (g) secondary sealing the pouch case.

In the step (f), the degas pusher may be disposed to correspond to at least one surface of the pouch case to apply pressure in a direction perpendicular to the plane of the pouch case, and the ultrasonic vibration may be applied in the pressing direction of the degas pusher. have.

In the step (f), it is preferable to penetrate the ultrasonic wave to the inside of the electrode assembly.

The step (f) is performed in a chamber for creating a vacuum atmosphere, and it is preferable to maintain the internal pressure of the chamber at -95 kPa or less.

In the step (b), the electrolyte can be injected through the opening formed in the extension provided on one side of the pouch case.

The step (c) may seal the opening to seal the opening, and the step (e) may form the degas hole inside the sealing line formed by the primary sealing.

According to the present invention, the degassing efficiency can be improved since the activation gas can be smoothly moved by pressurizing the cell during the degassing process and simultaneously applying ultrasonic waves to the cells to vibrate the electrolyte.

Therefore, when the present invention is applied, the degassing process is performed with high efficiency even for an electrode assembly having a high loading density and a high packing density, or a complicated structure such as a stack and folding structure that is difficult to remove gas. Can be improved.

The following drawings attached to this specification are illustrative of the preferred embodiments of the present invention, and together with the detailed description of the invention to serve to further understand the technical spirit of the present invention, the present invention is a matter described in such drawings It should not be construed as limited to.

1 is a cross-sectional view schematically showing a degassing process performed by a method of manufacturing a pouch type secondary battery according to the prior art.

2 is a cross-sectional view schematically illustrating a degassing process performed by a method of manufacturing a pouch type secondary battery according to a preferred embodiment of the present invention.

3 is a cross-sectional view illustrating a modification of FIG. 2.

4 is a flowchart illustrating a process of manufacturing a pouch type secondary battery according to a preferred embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

2 is a cross-sectional view schematically illustrating a degassing process performed by a method of manufacturing a pouch type secondary battery according to a preferred embodiment of the present invention.

2, in the manufacturing method of the pouch type secondary battery according to the preferred embodiment of the present invention, the degassing process is performed by arranging the degas pusher 100 and the ultrasonic device 110 to correspond to the planar portion of the cell 1. Press pressure and ultrasonic vibration are applied in the thickness direction of the cell.

Each cell 1 has a thin plate-like body and includes a pouch case 2 and an electrode assembly 3 which is built in the pouch case 2 and in which an anode, a separator and a cathode are alternately stacked. The positive electrode and the negative electrode are manufactured by applying a slurry such as an electrode active material, a binder resin, a conductive agent and other additives to at least one side of a current collector. In the case of the positive electrode, a conventional positive electrode active material such as a lithium-containing transition metal oxide is used in the case of a positive electrode, and in the case of the negative electrode, a lithium metal, a carbon material and a metal compound or a mixture thereof, in which lithium ions can be occluded and released. Conventional negative electrode active materials may be used. In addition, as the separator, a conventional porous polymer film used for a lithium secondary battery may be employed.

As the electrolyte solution contained in the pouch case 2 together with the electrode assembly 3, a conventional electrolyte solution for lithium secondary batteries may be employed. The pouch case 2 is formed of a sheet material, and includes a housing for accommodating the electrode assembly 3. Preferably, the pouch case 2 is formed by combining a first case and a second case formed by processing a sheet material into a predetermined shape. The sheet material of the pouch case is an outermost outer resin layer made of insulating material such as polyethylene terephthalate (PET) or nylon (Nylon), and an aluminum material that maintains mechanical strength and prevents penetration of moisture and oxygen. It is composed of a multi-layered structure in which a metal layer and an inner resin layer made of a polyolefin (Polyolepin) -based material having a heat adhesiveness and acting as a sealing material are laminated.

In the sheet material constituting the pouch case 2, a predetermined adhesive resin layer may be interposed between the inner resin layer and the metal layer and the outer resin layer and the metal layer as necessary. The adhesive resin layer is for smooth adhesion between dissimilar materials and is formed in a single layer or multiple layers. The material may be a polyolefin-based resin or a polyurethane resin for smooth processing, and a mixture thereof may be employed. .

At least a part of the edge of the cell 1 is a portion where sealing is performed by thermocompression or the like. Thus, the edge portion of the cell 1 is relatively thin in thickness compared to the body portion.

In the manufacturing process of the pouch type secondary battery, one side edge portion of the pouch case 2 is provided with a wider extension than the other portion, and the electrolyte is injected through an opening formed in the extension portion. After the injection of the electrolyte is completed, the opening is first sealed, and after the activation process for charging and discharging the cell 1, the degas hole 4 is formed inside the sealing line formed by the first sealing.

The degassing process after activation of the cell 1 is carried out inside a chamber which creates a vacuum atmosphere.

The degas pusher 100 is disposed to correspond to at least one surface of the cell 1 so that the pouch case 2 and the electrode assembly 3 may be disposed in a thickness direction of the cell 1, that is, a direction perpendicular to the plane of the pouch case 2. It is a press mechanism to apply pressure by pushing). The degas pusher 100 pressurizes the cell 1 to move the gas generated during the activation process and discharge the gas to the outside through the degas hole 4. The degas pusher 100 may be implemented by employing a conventional cylinder device.

The ultrasonic device 110 is disposed to correspond to at least one surface of the cell 1 to generate ultrasonic waves to penetrate in a direction perpendicular to the plane of the pouch case 2 during the degassing process to vibrate the electrolyte together with the gas. As the electrolyte vibrates by the ultrasonic waves, fluidity is generated in the electrolyte, thereby facilitating the movement of the gas.

The ultrasonic device 110 generates ultrasonic waves in a direction substantially coincident with the pressing direction of the degas pusher 100 to apply vibration to the electrolyte. In the ultrasonic device 110, the output of the ultrasonic transducer for generating ultrasonic waves is set to such a degree that the ultrasonic waves can penetrate to the inside of the electrode assembly 3, so that the activation gas and the electrolyte interposed between the electrodes of the electrode assembly 3 are It is preferable to flow up to.

As illustrated in FIG. 2, the ultrasound apparatus 110 may be installed in a structure embedded in a part of the degas pusher 100. Alternatively, as shown in FIG. 3, the ultrasonic device 110 may be installed in a structure in which a pair of the gas pusher 100 and the cell 1 are interposed therebetween.

During operation of the degas pusher 100 and the ultrasonic device 110, the internal pressure of the chamber 120 may be maintained at a vacuum of −95 kPa or less to maximize degas efficiency.

4 is a flowchart illustrating a process of manufacturing a pouch type secondary battery according to a preferred embodiment of the present invention.

Referring to Figure 4, the manufacturing method of the pouch-type secondary battery according to a preferred embodiment of the present invention, the casing process (step S10), the electrolyte injection process (step S20), the primary sealing process (step S30), the charge and discharge treatment process (Step S40), a degassing process (step S50) and a secondary sealing process (step S60).

The casing process (step S10) is a step of casing the electrode assembly 3 into the pouch case 2. In this case, a pair of electrode leads (not shown) connected to the electrode tabs provided in the electrode assembly 3 are drawn out of the pouch case 2, and the sealant attached to the electrode leads is attached to the electrode leads and the pouch case 2. It is interposed between the inner surfaces of the.

In the casing process (step S10), the pouch case 2 can seal the electrode assembly 3 by heat-sealing the edge portions, that is, the extension portions, which are in contact with each other. Since the heat fusion is partially omitted in the extension part, an opening for injecting the electrolyte may be formed.

The pouch case 2 used for the casing is located on the innermost side and has a first layer of polypropylene (PP) material having corrosion resistance, insulation and heat-sealing resistance to the electrolyte solution, and polyethylene tere having the outermost position and insulating property. It may include a second layer of a phthalate (PET) material, and a third layer interposed between the first layer and the second layer and made of a metal component such as aluminum (Al).

The electrolyte injection process (step S20) is a step of impregnating the electrolyte into the electrode assembly 3 by injecting the electrolyte through the opening of the pouch case 2 after the casing is completed.

The first sealing process (step S30) is a step of sealing the extension part by forming a predetermined sealing line to completely seal the electrode assembly 3 after the injection of the electrolyte is completed.

After sealing of the extension part of the pouch case 2 is completed, the activation process which advances charge / discharge with respect to the cell 1 is performed (step S40).

After the charging and discharging is completed, a process of cutting a portion of the extension along the predetermined cutting line may be performed at the outer portion of the sealing line. Since this cutting process cuts out an unnecessary part after sealing to the extension part is completed, it may be made between a primary sealing process (step S30) and a charge / discharge treatment process (step S40).

The degassing process (step S50) applies a physical external force to the cell 1 in a state where the degas hole 4 is formed on the extension portion, and degass the gas generated in the pouch case 2 during the charge / discharge process. Discharging through the hole (4). Here, the degas hole 4 is a fine hole formed through the extension part for discharging gas, and is formed inward of the sealing line formed by the sealing, and a plurality of degas holes 4 may be formed by punching or the like along a direction parallel to the sealing line. have.

In the degassing process (step S50), pressure is applied in the direction of the electrode assembly 3 from the outside of the pouch case 2 using the degas pusher 100, and ultrasonic waves are generated using the ultrasonic device 110 to generate electrolyte. By vibrating, the gas is discharged to the outside of the pouch case 2 with high efficiency.

In the degassing process (step S50), the degas pusher 100 is disposed corresponding to at least one surface of the pouch case 2 to apply a press pressure in a direction perpendicular to the plane of the pouch case 2, and at the same time 110 applies ultrasonic vibration in the pressing direction of the degas pusher 100. In this process, the ultrasonic waves penetrate into the inside of the electrode assembly 2 and flow up to the activation gas and electrolyte interposed between the electrodes of the electrode assembly 3. At this time, in order to maximize the gas efficiency, the internal pressure of the chamber 120 is preferably maintained at -95 kPa or less.

The secondary sealing process (step S60) is a step of closing the degas hole 4 of the degassed cell 1 by taping or the like. In the case of the taping treatment, a tape made of, for example, a polypropylene (PP) material may be used in the same manner as the innermost surface of the pouch case 2, that is, the first layer.

After the secondary sealing is completed, a wing folding process of folding up the extension of the pouch case 2 inward may be added.

As described above, the manufacturing method of the pouch type secondary battery according to the preferred embodiment of the present invention pressurizes the cell during the degassing process and at the same time by applying ultrasonic waves to vibrate the gas and the electrolyte to promote the movement of the gas to improve the degassing efficiency Can be improved.

Accordingly, the present invention can be applied in the manufacture of a pouch type secondary battery having an electrode assembly having high packing density or an electrode assembly which is difficult to remove gas such as a stack and folding structure, thereby improving the quality of a cell.

Although the present invention has been described above by means of limited embodiments and drawings, the present invention is not limited thereto and will be described below by the person skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of the claims.

Claims (6)

  1. (a) casing the electrode assembly into a pouch case;
    (b) injecting an electrolyte solution through a portion of the pouch case;
    (c) first sealing the pouch case;
    (d) charging and discharging;
    (e) forming a gas hole in the pouch case;
    (f) discharging an activation gas to the outside of the pouch case while applying ultrasonic pressure from the outside of the pouch case toward the electrode assembly and generating ultrasonic waves to vibrate the electrolyte solution; And
    (g) secondary sealing the pouch case; a method of manufacturing a pouch type secondary battery comprising a.
  2. The method of claim 1, wherein step (f) comprises:
    Placing a degas pusher corresponding to at least one surface of the pouch case to apply pressure in a direction perpendicular to the plane of the pouch case,
    The method of manufacturing a pouch type secondary battery, characterized in that the ultrasonic vibration is applied in the pressing direction of the degas pusher.
  3. The method of claim 2, wherein step (f) comprises:
    Method of manufacturing a pouch type secondary battery, characterized in that to penetrate the ultrasonic wave to the inside of the electrode assembly.
  4. The method of claim 2, wherein step (f) comprises:
    A method of manufacturing a pouch type secondary battery, which is performed in a chamber for creating a vacuum atmosphere and maintains the internal pressure of the chamber at -95 kPa or less.
  5. The method of claim 1, wherein in step (b),
    Method of manufacturing a pouch type secondary battery, characterized in that the electrolyte is injected through the opening formed in the extension provided on one side of the pouch case.
  6. The method of claim 5,
    In step (c), the opening is sealed and sealed.
    The step (e) is a manufacturing method of the pouch type secondary battery, characterized in that for forming the gas hole inside the sealing line formed by the primary sealing.
PCT/KR2017/015271 2017-02-13 2017-12-21 Method for manufacturing pouch type secondary battery WO2018147549A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1020170019630A KR20180093482A (en) 2017-02-13 2017-02-13 Method for manufacturing pouch type secondary battery
KR10-2017-0019630 2017-02-13

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WO2018147549A1 true WO2018147549A1 (en) 2018-08-16

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019098612A1 (en) 2017-11-14 2019-05-23 주식회사 엘지화학 Cathode slurry composition, secondary battery cathode comprising same, and lithium secondary battery

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101334623B1 (en) * 2010-12-02 2013-11-29 주식회사 엘지화학 Degassing Method of Secondary Battery Using Centrifugal Force
KR20140018014A (en) * 2012-08-03 2014-02-12 에스케이이노베이션 주식회사 The manufacturing method of pouch type secondary battery
KR20140018695A (en) * 2012-08-03 2014-02-13 에스케이이노베이션 주식회사 The sealing method of pouch type secondary battery
KR101456901B1 (en) * 2012-05-16 2014-10-31 주식회사 엘지화학 Device for Removing Gas from Battery Cell
KR20150062849A (en) * 2013-11-29 2015-06-08 주식회사 엘지화학 Method For Manufacturing Polymer Battery

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101334623B1 (en) * 2010-12-02 2013-11-29 주식회사 엘지화학 Degassing Method of Secondary Battery Using Centrifugal Force
KR101456901B1 (en) * 2012-05-16 2014-10-31 주식회사 엘지화학 Device for Removing Gas from Battery Cell
KR20140018014A (en) * 2012-08-03 2014-02-12 에스케이이노베이션 주식회사 The manufacturing method of pouch type secondary battery
KR20140018695A (en) * 2012-08-03 2014-02-13 에스케이이노베이션 주식회사 The sealing method of pouch type secondary battery
KR20150062849A (en) * 2013-11-29 2015-06-08 주식회사 엘지화학 Method For Manufacturing Polymer Battery

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