KR100686817B1 - Pouch type Li Secondary Battery and Method of fabrcating the same - Google Patents

Abstract

The present invention relates to a pouch type lithium secondary battery and a manufacturing method thereof having a simplified pack process by performing a pack process using a part of a pouch packaging material without using a separate pack case, and the pouch type lithium secondary of the present invention. The battery includes an electrode assembly including a first electrode plate having a first electrode tab, a second electrode plate having a second electrode tab, and a separator positioned between the first electrode plate and the second electrode plate; The first pouch sheath and the second pouch sheath are brought into contact with each other and are fusion-bonded, and each includes an electrode assembly accommodating part and a wing extending from one side of the electrode assembly accommodating part, and the wing part winds up the side of the electrode assembly accommodating part as a whole. It is made with a pouch case made of a shape.

Pouch Type Lithium Secondary Battery, Tubing, Hot Melt

Description

Pouch type lithium secondary battery and manufacturing method thereof {Pouch type Li Secondary Battery and Method of fabrcating the same}

Figure 1a is a perspective view for explaining a pouch-type lithium secondary battery according to an embodiment of the present invention.

FIG. 1B is a cross sectional view along line A-A in FIG. 1A;

1C is a cross sectional view along line B-B in FIG. 1A;

2 is a process flowchart illustrating a method of manufacturing a pouch-type lithium secondary battery according to an embodiment of the present invention.

3A to 3D are views for explaining a method of manufacturing a pouch-type lithium secondary battery according to an embodiment of the present invention.

4 is a process flowchart illustrating a method of manufacturing a pouch-type lithium secondary battery according to another embodiment of the present invention.

5A to 5E are views for explaining a method of manufacturing a pouch-type lithium secondary battery according to another embodiment of the present invention.

(Explanation of symbols for main parts of drawing)

100; Pouch type lithium secondary battery 200; Electrode assembly

210; First electrode plate 215; First electrode tab

220; Second electrode plate 225; Second electrode tab

230; Separator 240; Insulation tape

251, 255; Insulation plate 300; Pouch Exterior

310; First pouch case 310a; Deep

310b; Heat seal layer 310c; Insulating film

313; Electrode assembly receiving spaces 313A, 315A; Electrode Assembly Receptacle

314; Gas collection space 315; 1st space

317; Second space 320; 2nd Pouch Exterior

320a; Substrate 320b; Coating film

330; Fold 340; First through hole

350; Second through hole 360; 1st way

370; Second traveling path 400; Protection circuit module

410; Input and output terminals 510 and 520; Molding part

The present invention relates to a pouch-type lithium secondary battery and a method for manufacturing the same. More specifically, a pouch-type lithium is simplified by performing a pack process using a part of the pouch exterior material without using a separate pack case. A secondary battery and a method for manufacturing the same.

Recently, compact and lightweight electric / electronic devices such as cellular phones, notebook computers, camcorders, etc. have been actively developed and produced. These portable electric / electronic devices have a battery pack that can be operated in a place where no separate power source is provided. The built-in battery pack includes at least one battery therein for outputting a predetermined level of voltage for driving the portable electric / electronic device for a period of time.

In view of economical aspects, the battery pack employs a secondary battery capable of charging and discharging. Representative secondary batteries include lithium secondary batteries such as nickel-cadmium (Ni-Cd) batteries, nickel-hydrogen (Ni-MH) batteries, lithium (Li) batteries, and lithium ion (Li-ion) batteries.

In particular, the lithium secondary battery has an operating voltage of 3.6 V, which is three times higher than that of a nickel-cadmium battery or a nickel-hydrogen battery, which is widely used as a power source for portable electronic equipment, and is rapidly increasing in terms of high energy density per unit weight. to be.

Such lithium secondary batteries mainly use lithium-based oxides as positive electrode active materials and carbon materials as negative electrode active materials. In general, a battery is classified into a liquid electrolyte battery and a polymer electrolyte battery according to the type of electrolyte, and a battery using a liquid electrolyte is called a lithium ion battery, and a battery using a polymer electrolyte is called a lithium polymer battery. Moreover, although a lithium secondary battery is manufactured in various shapes, typical shapes include cylindrical shape, square shape, and pouch type.

Typically, the pouch-type lithium secondary battery of the lithium secondary battery is a pouch packaging material is usually composed of a multilayer layer of a metal foil layer and a synthetic resin layer covering the same, when using the battery than a cylindrical or square lithium secondary battery using a metal can The weight of the battery can be remarkably reduced, and the weight reduction of the lithium secondary battery has been developed toward the pouch type lithium secondary battery.

In general, the pouch-type lithium secondary battery accommodates the electrode assembly on the bottom surface of the pouch case having a space for accommodating the electrode assembly, covers the bottom surface by using the top surface of the pouch case, and seals the pouch bare cell. forming a bare cell, attaching an accessory, such as a protection circuit module, to the pouch bare cell to form a pouch core pack, and then forming the pouch core pack in a battery pack case.

However, the process is lengthened because it is formed by using a separate battery pack case of the pouch-type lithium secondary battery as described above, and thus there has been a limitation in improving the yield per unit time of the pouch-type lithium secondary battery.

In addition, there is a limitation in lowering the manufacturing cost of the pouch-type lithium secondary battery by using a separate battery pack case.

An object of the present invention is to solve the above problems of the prior art, the present invention does not use a separate pack case, by performing a pack process using a pouch packaging material, the pouch-type lithium secondary battery simplified the pack process And a method for producing the same.

Pouch-type lithium secondary battery of the present invention for achieving the above object is a first electrode plate with a first electrode tab, a second electrode plate with a second electrode tab and the first electrode plate and the second electrode plate An electrode assembly having a separator positioned therebetween; The first pouch sheath and the second pouch sheath are brought into contact with each other and are fusion-bonded, and each includes an electrode assembly accommodating part and a wing extending from one side of the electrode assembly accommodating part, and the wing part winds up the side of the electrode assembly accommodating part as a whole. It is made with a pouch case made of a shape.

A protective circuit electrically connected to the first electrode tab and the second electrode tab on the upper side of the pouch case and having an input / output terminal for charging and discharging on the upper surface, and controlling charging, discharging and malfunction of the electrode assembly. It is preferable to further include a module.

An upper molding part covering the upper portion of the protective circuit module and exposing an input / output terminal formed on the upper surface may be further included.

A lower molding part may be further included to protect the lower portion of the pouch case.

The molding part is preferably formed using hot melt.

The hot melt is preferably a hot melt adhesive, more preferably the hot melt is EVA (Ethylene-Vinyl Acetate copolymer) material, polyamide (polyamide), polyester (polyester) material, rubber (rubber) ) Is preferably any one selected from the group consisting of a material and a polyurethane-based material.

Upper and lower insulating plates may be further provided on the upper and lower portions of the electrode assembly.

The first pouch packaging material and the core portion, the heat-sealed layer formed on the upper surface of the core portion; It is preferable that the insulating film is formed on the lower surface of the core portion. At this time, the core portion is made of aluminum (Al), the heat-sealing layer is made of modified polypropylene, the insulating film is preferably made of any one of nylon or polyethylene terephthalate.

The second pouch packaging material preferably includes a substrate and a coating film coated on one surface of the substrate. At this time, the substrate is made of SUS (steel use stainless), the coating film is preferably made of any one of PP (polypropylene) and PE (polyethylene).

In addition, the manufacturing method of the pouch-type lithium secondary battery of the present invention includes a first pouch packaging material and a second pouch packaging material, wherein any one of the first pouch packaging material and the second pouch packaging material has an electrode assembly accommodating space. Preparing a; An electrode assembly including a first electrode plate with a first electrode tab, a second electrode plate with a second electrode tab, and a separator positioned between the first electrode plate and the second electrode plate in the electrode assembly accommodation space; Accommodating; Sealing the pouch sheath to form a pouch bare cell; And winding the tubing around the space in which the electrode assembly is accommodated by using a portion of the pouch sheath.

The electrode assembly accommodating space is preferably located to the left or right side of the first pouch case.

The method may further include electrically connecting a protective circuit module having an input / output terminal on an upper surface of the pouch case to the first electrode tab and the second electrode tab.

The method may further include forming an upper upper molding part on an upper portion of the outer cover to cover an upper portion of the protective circuit module by using hot melt and to expose an input / output terminal formed on the upper surface.

The method may further include forming a lower molding part formed using hot melt.

Forming a pouch bare cell by heat-sealing the pouch sheathing material is to cover and contact the first pouch sheathing material using a second pouch sheathing material, and to contact the first and second pores and between the first and second pores. A first heat fusion step of forming a gas collection space; Injecting and impregnating an electrolyte through the first through hole; A second heat fusion step of heat fusion bonding the first through hole; Collecting gas into the gas collecting space by initial charging and discharging; It is preferable to include a third heat fusion step of heat-sealing the second through-hole and the gas collecting space.

The first through hole is located on the opposite side of the electrode assembly receiving space of the edge of the gas collecting space and connected to the outside, the second through hole is preferably located between the electrode assembly receiving space and the gas collecting space.

In addition, the manufacturing method of the pouch-type lithium secondary battery of the present invention includes a first pouch packaging material and a second pouch packaging material, wherein any one of the first pouch packaging material and the second pouch packaging material is provided with a first space and a second space. Preparing a pouch case; Accommodating an electrode assembly in any one of the first space and the second space; Thermally fusion bonding the first pouch case and the second pouch case together; Initially charging and discharging and collecting gas into one of the first space and the second space; Cutting between the first space and the second space to remove another space in which the gas is collected among the first space and the second space; And tubing the entirety of the space in which the electrode assembly is accommodated using a portion of the pouch sheathing material.

Preferably, the electrode assembly is accommodated in the first space.

The step of thermally fusion by contacting the first pouch case and the second pouch case may include: a first moving path connecting the first space and the outside of the second pouch case by connecting the second space and the outside; It is preferable to form a second moving path between the first space and the second space.

The first moving path may be located at an opposite side of the first space of the second space edge and connected to the outside.

The method may further include injecting an electrolyte through the second moving path.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

Like reference numerals in the drawings denote like elements.

1A is a perspective view illustrating a pouch-type lithium secondary battery according to an exemplary embodiment of the present invention, FIG. 1B is a cross-sectional view taken along the line A-A of FIG. 1A, and FIG. 1C is a cross-sectional view taken along the line B-B of FIG. 1A.

1A and 1B, a pouch-type lithium secondary battery 100 according to an embodiment of the present invention includes an electrode assembly 200, a pouch packaging material 300 accommodating the electrode assembly 200, and And a protection circuit module 400 for controlling charging and discharging of the electrode assembly 200 and upper and lower molding parts 510 and 520 formed through hot melting.

The electrode assembly 200 may be coated with any one of a positive electrode active material and a negative electrode active material, for example, a first electrode plate 210 coated with a positive electrode active material, another one of a positive electrode active material and a negative electrode active material, for example, a negative electrode active material. The second electrode plate 220, the first electrode plate 210, and the second electrode plate 220 to be positioned between the first electrode plate 210 and the second electrode plate 220. It is made of a separator 230 to prevent and to only move the lithium ions. In addition, the first electrode plate 210 is generally made of aluminum (Al), and a first electrode tab 215 is formed to protrude a predetermined length and serve as a positive electrode tab. The second electrode plate 220 is generally made of a nickel (Ni) material, but the second electrode tab 225 that protrudes a predetermined length to act as a negative electrode tab is bonded, but in the present invention to limit the above material It is not. In addition, an insulating tape 240 may be further provided to prevent a short circuit between the first electrode tab 215 and the second electrode tab 225 and the pouch sheath 300. In addition, the first electrode tab 215 and the second electrode tab 225 are drawn out through one side of the pouch sheath 300, and the first electrode tab 215 and the second electrode tab are drawn out. 225 is electrically connected to the protection circuit module 400. In addition, upper and lower insulating plates 251 and 255 may be further attached to upper and lower portions of the electrode assembly 200 to prevent the electrode assembly 200 from contacting the pouch sheath 300.

In addition, a chalcogenide compound is used as the cathode active material, and complex metal oxides such as LiCoO 2, LiMn 2 O 4, LiNiO 2, LiNi 1-x Cox O 2 (0 <x <1), and LiMnO 2 are used. As the negative electrode active material, carbon (C) -based materials, Si, Sn, tin oxides, composite tin alloys, transition metal oxides, lithium metal nitrides, or lithium metal oxides are used. Also, in general, the anode electrode plate is made of aluminum (Al), the cathode electrode plate is made of copper (Cu), and the separator is generally made of polyethylene (PE) or polypropylene (PP). It does not limit the above materials.

Meanwhile, in the present invention, the direction in which the first electrode tab 215 and the second electrode tab 225 of the pouch-type lithium secondary battery 100 are drawn out is assumed to be an "upper" direction.

The pouch packaging material 300 accommodates the electrode assembly 200, and a portion of the pouch packaging material 300 has a shape in which a portion of the pouch packaging material 300 is wound around the space in which the electrode assembly 200 is accommodated.

In addition, the pouch sheath 300 is preferably made of a first pouch sheath 310 and a second pouch sheath 320.

In this case, the first pouch case 310 is a core portion made of a metal material such as aluminum (Al), a heat-sealing layer formed on the upper surface of the core portion, and an insulating film formed on the lower surface of the core portion Is done. The heat seal layer is a polymer resin modified polypropylene, for example, CPP (Casted Polypropylene) is used as an adhesive layer, the insulating film may be formed of a resin material such as nylon (nylon) or polyethylene terephthalate (PET), Herein, the structure and material of the pouch case 300 are not limited.

In addition, the second pouch packaging material 320 is preferably made of a structure having a substrate made of a material having a greater strength than aluminum (Al), such as SUS (steel use stainless), and a coating film coated on any one surface of the substrate. Do. The coating film of the second pouch sheath 320 is preferably a polymer material which is PP (polypropylene), PE (polyethylene) and the like, but is not limited thereto.

The protection circuit module 400 is electrically connected to the first electrode tab 215 and the second electrode tab 225 of the electrode assembly 200 on the pouch sheath 300, and the electrode assembly 200. And to control the charging, discharging, and malfunction of the c). For example, when overcurrent flows from the electrode assembly 200, the overcurrent is blocked. In addition, the protection circuit module 400 includes an input / output terminal 410 for charging and discharging the pouch-type lithium secondary battery 100 on an upper surface thereof. In addition, the protection circuit module 400 is not shown in the drawing, but generally has a structure having a variety of protection circuits.

The upper and lower molding parts 510 and 520 are molded parts through a hot melting method using the hot melt. The upper and lower molding parts 510 and 520 serve to keep the pouch sheath 300 in the form of a tube.

In addition, hot melt used for the upper and lower molding parts 510 and 520 is a hot melt adhesive, which is 100% solid at room temperature without using water or a solvent, and is nonvolatile, nonflammable, and thermoplastic. It is preferable to apply the adhesive force while coating and adhering the adherend in a liquid state at a high temperature using a resin (themoplastic-resin) while cooling and solidifying within a few seconds.

The hot melt used for the upper and lower molding parts 510 and 520 may be an EVA (Ethylene-Vinyl Acetate copolymer) based material, a polyamide based polyester, a polyester based rubber, or a rubber It is preferably any one selected from the group consisting of) -based materials and polyurethane-based materials.

In addition, the upper molding part 510 is a molded part through a hot melting method using a hot melt on the part where the protection circuit module 400 on the upper part of the pouch exterior material 300 is seated. The input / output terminal 410 of the protection circuit module 400 is formed to be exposed.

In addition, the lower molding part 520 is a pouch-type lithium secondary battery 100 according to an embodiment of the present invention, the pouch-type lithium secondary battery 100 because the pouch packaging material 300 performs the pack process, The lower part of is molded using hot melt because it can be more vulnerable to external environment such as sticking than other parts.

2 is a flowchart illustrating a method of manufacturing a pouch-type lithium secondary battery according to an embodiment of the present invention.

2, in the manufacturing process of the pouch-type lithium secondary battery according to the preferred embodiment of the present invention, preparing a first pouch exterior material and a second pouch exterior material including an electrode assembly accommodating space (S1), Accommodating an electrode assembly and impregnating an electrode assembly (S4), accommodating an electrode assembly in a first pouch sheathing material (S2), and first heat-sealing the first and second pouch sheathing material (S3). And performing a second heat fusion of the second pouch sheathing material (S5), performing initial charging and discharging to collect a gas (S6), and performing a third heat fusion bonding of the first and second pouch sheathing material (S7). By attaching the protective circuit module (S8), the step of tubing using the pouch case (S9) and the hot-melting step (S10) of the upper and lower, by the pouch type according to an embodiment of the present invention A lithium secondary battery is manufactured.

3A to 3D are views for explaining a method of manufacturing a pouch-type lithium secondary battery according to an embodiment of the present invention. Hereinafter, a method of manufacturing a pouch-type lithium secondary battery according to an embodiment of the present invention together with FIG. 2 will be described.

First, in the step (S1) of preparing the first pouch packaging material and the second pouch packaging material having the electrode assembly accommodating space, the first pouch packaging material 310 and the second pouch packaging material 320 may be used. The pouch packaging material 300 is prepared.

At least one of the first pouch sheath 310 and the second pouch sheath 320, for example, the first pouch sheath 310 may include an electrode assembly accommodating space 313. In this case, the electrode assembly accommodating space 313 is preferably positioned at any one of the left side or the right side of the first pouch packaging material 310. In addition, the pouch sheath 300 made of the first pouch sheath 310 and the second pouch sheath 320 may be long enough to be wound one more time after accommodating the electrode assembly 200.

The first pouch packaging material 310 may include a core portion 310a formed of a metal material such as aluminum (Al), a heat seal layer 310b formed on an upper surface of the core portion 310a, and the core portion ( And an insulating film 310c formed on the lower surface of 310a. The heat seal layer 310b serves as an adhesive layer using a modified polypropylene, for example, a polymer resin, such as CPP (Casted Polypropylene), and the insulating layer 310c may be formed of a resin material such as nylon (nylon) or polyethylene terephthalate (PET). Although it may be formed, the structure and material of the pouch case 300 is not limited thereto.

In addition, the second pouch case 320 is a substrate 320a made of a material having a greater strength than aluminum (Al), such as SUS (steel use stainless), and a coating film 320b coated on any one surface of the substrate 320a. It is preferable to have a structure provided with). The coating film 320b of the second pouch packaging material 320 is preferably a polymer material which is PP (polypropylene), PE (polyethylene) and the like, but is not limited thereto.

In addition, the coating film 320b of the second pouch sheath 320 is disposed to face the heat seal layer 310b of the first pouch sheath 310.

In the receiving of the electrode assembly in the first pouch sheathing material (S2), as shown in FIG. 3A, the electrode assembly 200 is prepared, and the electrode assembly 200 is accommodated in the electrode assembly of the first pouch sheathing material 300. It is stored in the space 313. In this case, the first electrode tab 215 and the second electrode tab 225 of the electrode assembly 200 protrude out of a predetermined length. In this case, it is assumed that the direction in which the first electrode tab 215 and the second electrode tab 225 protrude from the upper direction of the pouch type lithium secondary battery.

On the other hand, the order of preparing the electrode assembly 200 and the pouch packaging material 300 is not necessarily limited thereto, and the pouch packaging material 300 may be prepared after preparing the electrode assembly 200 first.

Although not shown in the drawings, upper and lower insulating plates may be further attached to upper and lower portions of the electrode assembly 200 to prevent the electrode assembly 200 from contacting the pouch sheath 300. .

In the first heat fusion bonding of the first and second pouch sheaths (S3), as shown in FIG. 3B, the electrode assembly 200 is accommodated in the electrode assembly accommodating space 313 of the first pouch sheath 310. Thereafter, the first pouch sheathing material 310 is covered using the second pouch sheathing material 320, and a portion where the first pouch sheathing material 310 and the second pouch sheathing material 320 contact each other is heat-sealed.

In this case, the first heat fusion is heat fusion between the edge of the pouch sheath 300 and most of the edge of the electrode assembly accommodating space 313, and the gas collecting space 314 is formed on the side of the electrode assembly accommodating space 313. ) Is formed. In addition, a portion of the gas collecting space 314 is opened at the edge of the gas collecting space 314 and the first through hole 340 is connected to the outside, the electrode assembly receiving space 313 and the gas Between the space 314 for collecting is located a second through-hole 350 which is partially opened. That is, the second through hole 350 becomes a connection passage between the electrode assembly accommodating space 313 and the gas collecting space 314.

In addition, the electrode assembly accommodating space 313 accommodates the electrode assembly 200, and then accommodates the electrode assembly through first heat fusion bonding the first pouch sheath 310 and the second pouch sheath 320. It acts as a part 313A.

Injecting the electrolyte solution and impregnating the electrode assembly (S4), the electrolyte is injected through the first through hole 340 with the gas collection space 314 as an upper portion, and exposed to a vacuum atmosphere to expose the electrolyte solution. The electrode assembly 200 is impregnated.

In the second heat fusion bonding of the first and second pouch sheaths (S5), as shown in FIG. 3C, after injecting the electrolyte solution and impregnating the electrode assembly 200, a first through-hole of the pouch sheath 300 is formed. It is a step of sealing by heat fusion 340.

In the step (S6) of performing the initial charging and discharging to collect the gas, as shown in FIG. 3C, after the first through hole 340 is thermally fused, the gas collecting space 314 is placed upward. Discharge. At this time, gas is generated in the electrode assembly 200 during the initial charging and discharging process, and the gas is collected into the gas collecting space 314 through the second through hole 350.

In the third thermal fusion bonding of the first and second pouch sheaths (S7), as shown in FIG. 3D, the gas is collected in the gas collecting space 314 through the initial charging and discharging process, and then the second through hole is formed. The pouch bare cell is formed by thermally fusion bonding 350 and bonding the gas collecting space 314 to the gas collecting space 314 after discharging the gas.

In the attaching the protection circuit module (S8), after performing the third heat fusion, the protection circuit module protects the first electrode tab 215 and the second electrode tab 225 protruding upwardly of the pouch bare cell. The circuit module 400 is electrically attached.

In this case, the protection circuit module 400 includes various protection circuits to control charging / discharging and malfunction of the electrode assembly 200, and an input / output terminal 410 for charging and discharging the electrode assembly 200. ).

In the step of tubing using the pouch sheathing material (S9), after attaching the protection circuit module 400, a space for accommodating the electrode assembly 200 using the pouch sheathing material 300 is in the form of a tube. Take a turn.

In this case, the order of attaching the protection circuit module (S8) and the tubing using the pouch sheathing material (S9) is not necessarily limited thereto, and the step (S9) of tubing using the pouch sheathing material is performed first. After that, the step of attaching the protection circuit (S8) may be performed.

In the hot-melting step (S10) of the upper and lower parts, the upper and lower parts of the pouch bare cell are attached to the protective circuit module 400 after winding the space accommodating the electrode assembly. To form the upper and lower molding parts 510 and 520 by hot melting the lower part of the pouch bare cell on the other side using hot melt to manufacture the pouch type lithium secondary battery 100. do.

In this case, the input and output terminals 410 of the protection circuit module 400 may be hot melted to be exposed to the outside.

In addition, by hot-melting the upper and lower portions of the pouch packaging material 300, the shape of the tubing using a portion of the pouch packaging material 300 is maintained.

4 is a flowchart illustrating a method of manufacturing a pouch-type lithium secondary battery according to another embodiment of the present invention.

Referring to FIG. 4, in the manufacturing process of the pouch type lithium secondary battery according to another embodiment of the present invention, preparing a first pouch exterior material and a second pouch exterior material including a first space and a second space (S11) And storing the electrode assembly in the first space (S12), heat-sealing the first and second pouch sheaths except for the first moving path and the second moving path (S13), and injecting an electrolyte solution to inject the electrode assembly. Impregnating (S14), heat-sealing the first moving path (S15), performing initial charging and discharging, collecting gas into the second space (S16), and opening the second moving path. Fusion and removal of the second space (S17), attaching the protection circuit module (S18), tubing using a pouch case (S19) and hot-melting the upper and lower parts (S20) by proceeding , Pouch-type lithium secondary battery according to an embodiment of the present invention Makes paper.

5A to 5E are views for explaining a method of manufacturing a pouch-type lithium secondary battery according to another embodiment of the present invention. Hereinafter, a method of manufacturing a pouch-type lithium secondary battery according to an embodiment of the present invention together with FIG. 2 will be described.

First, in the step (S11) of preparing a first pouch packaging material and a second pouch packaging material having a first space and a second space, as shown in Figure 5a, the first pouch packaging material 310 and the second pouch packaging material ( A pouch packaging material 300 consisting of 320 is prepared.

In this case, at least one of the first pouch sheath 310 and the second pouch sheath 320, for example, the first pouch sheath 310 has a first space 315 and a second space 317. It is desirable to.

The first pouch packaging material 310 may include a core portion 310a formed of a metal material such as aluminum (Al), a heat seal layer 310b formed on an upper surface of the core portion 310a, and the core portion ( And an insulating film 310c formed on the lower surface of 310a. The heat seal layer 310b serves as an adhesive layer using a modified polypropylene, for example, a polymer resin, such as CPP (Casted Polypropylene), and the insulating layer 310c may be formed of a resin material such as nylon (nylon) or polyethylene terephthalate (PET). Although it may be formed, the structure and material of the pouch case 300 is not limited thereto.

In addition, the second pouch packaging material 320 is a substrate 320a made of a material having a greater strength than aluminum (Al), such as SUS (steel use stainless), and a coating film coated on one surface of the substrate 320a ( It is preferred to have a structure having 320b). The coating film 320b of the second pouch packaging material 320 is preferably a polymer material which is PP (polypropylene), PE (polyethylene) and the like, but is not limited thereto.

In addition, the coating film 320b of the second pouch sheath 320 is disposed to face the heat seal layer 310b of the first pouch sheath 310.

In the receiving of the electrode assembly in the first space (S12), as shown in Figure 5a, the space of any one of the first space 315 and the second space 317 of the first pouch packaging material 310 For example, the electrode assembly 200 is accommodated in the first space 310. In this case, the first electrode tab 215 and the second electrode tab 225 of the electrode assembly 200 protrude out of a predetermined length.

On the other hand, the order of preparing the electrode assembly 200 and the pouch packaging material 300 is not necessarily limited thereto, and the pouch packaging material 300 may be prepared after preparing the electrode assembly 200 first.

In the step (S13) of thermally bonding the first and second pouch sheaths except for the first movement path and the second movement path, as illustrated in FIG. 3B, the first space 315 of the first pouch sheathing material 310 is formed. ) And the first pouch sheath 310 using the second pouch sheath 320, after receiving the electrode assembly 200 in one of the second spaces 317. The cover portion is heat-sealed to a portion where the first pouch exterior material 310 and the second pouch exterior material 320 abut.

In more detail, first, the electrode assembly 200 is accommodated in the first space 315 of the first pouch sheathing material 310, and then the first pouch sheathing material is formed using the second pouch sheathing material 300. Cover the 310 to abut each other. Thereafter, the first pouch exterior member 310 and the second pouch exterior member 320 are thermally bonded to each other in contact with each other, and the first movement path 360 connecting the second space 317 to the outside, A second movement path 370 is formed between the first space 315 and the second space 317. That is, the first pouch exterior member 310 and the second pouch exterior member 320 are heat-sealed to connect the second space 317 and the outside with a first movement path 360 and the first space 315. ) And a second moving path 370 connecting the second space 317. In this case, the first space 315 serves as an electrode assembly accommodating portion 315A.

Injecting an electrolyte solution and impregnating the electrode assembly (S14), the electrolyte is injected through the first movement path 360 with the second space 317 upward, and exposed to a vacuum atmosphere to expose the electrolyte solution to the electrode. Impregnated in assembly 200.

In the step of heat fusion of the first moving path (S15), the electrolyte is injected and impregnated in the electrode assembly 200, and then the first moving path 360 is heat-sealed and bonded.

Initial charging / discharging is performed, and in step S16 of collecting gas into the second space, initial charging / discharging is performed with the second space 317 as an upper portion. At this time, gas is generated in the electrode assembly 200 during the initial charging and discharging process, and the gas is collected into the second space 340 through the second moving path 370.

In the step (S17) of thermally fusion-bonding the second moving path and removing the second space, as shown in FIG. 5D, the gas is collected in the second space 317 through the initial charging and discharging process, and then the second space is removed. The second moving path 370 between the first space 315 and the second space 317 is thermally bonded to each other. Thereafter, the first space 315 and the second space 317 are cut off to remove the second space 317 in which the gas generated during the initial charge / discharge process is collected.

In the attaching the protection circuit module (S18), the second space 317 is cut and removed, and then, the protection circuit is connected to the first electrode tab 215 and the second electrode tab 225 of the electrode assembly 200. The module 400 is electrically attached. In this case, the protection circuit module 400 includes various protection circuits to control charging / discharging and malfunction of the electrode assembly 200, and an input / output terminal 410 for charging and discharging the electrode assembly 200. ).

In the step of tubing using the pouch sheathing material (S19), after attaching the protective circuit module 400, a space for accommodating the electrode assembly 200 by using a portion of the pouch sheathing material 300 is a tube (tube). ) Take a turn around.

At this time, the order of attaching the protective circuit module (S18) and the step of tubing using the pouch sheathing material (S19) is not necessarily limited to this, and the step of tubing using the pouch sheathing material (S19) first After that, the step of attaching the protection circuit (S18) may be performed.

In the hot-melting step (S20) of the upper and lower parts, after wrapping the accommodating part 315A containing the electrode assembly by using the pouch sheath 300, the protection circuit module 400 of the pouch bare cell is Pouch-type lithium secondary batteries are formed by hot melting the upper part of the upper part and the lower part of the pouch bare cell opposite to each other using hot melt to form upper and lower molding parts 510 and 520. 100) is prepared.

In this case, the input and output terminals 410 of the protection circuit module 400 may be hot melted to be exposed to the outside.

In addition, by hot-melting the upper and lower portions of the pouch packaging material 300, the shape of the tubing using a portion of the pouch packaging material 300 is maintained.

As described above, the pouch-type lithium secondary battery according to the exemplary embodiment of the present invention does not use a separate pack case, and a portion of the pouch exterior material surrounds the electrode assembly accommodating portions 313A and 315A. By carrying out the pack process in a form, it is possible to simplify the pack process.

In addition, the manufacturing cost of the pouch type lithium secondary battery can be reduced by not using a separate pack case.

In addition, when the pouch-type lithium secondary battery 100 of the present invention is formed using the process as illustrated in FIGS. 2 and 3A to 3E, the loss of the pouch packaging material 300 may be minimized.

In addition, by using a material having a higher strength than that of the first pouch sheath 310, the second pouch sheath 320 may have improved resistance to external pressure and the like of the pouch-type lithium secondary battery 100 of the present invention.

According to the present invention as described above, the present invention can provide a pouch-type lithium secondary battery and a method of manufacturing the same by simplifying the pack process by performing a pack process using a pouch case without using a separate pack case. have.

While the foregoing has been described with reference to preferred embodiments of the present invention, those skilled in the art will be able to variously modify and change the present invention without departing from the spirit and scope of the invention as set forth in the claims below. It will be appreciated.

Claims (27)

An electrode assembly having a first electrode plate with a first electrode tab, a second electrode plate with a second electrode tab, and a separator positioned between the first electrode plate and the second electrode plate; The first pouch sheath and the second pouch sheath are brought into contact with each other and are fusion-bonded, and each includes an electrode assembly accommodating part and a wing extending from one side of the electrode assembly accommodating part, and the wing part is wound around the side of the electrode assembly accommodating part. Pouch packaging material having a shape; A protective circuit electrically connected to the first electrode tab and the second electrode tab on the upper side of the pouch case and having an input / output terminal for charging and discharging on the upper surface, and controlling charging, discharging and malfunction of the electrode assembly. A module;  An upper molding part covering an upper portion of the protection circuit module and exposing an input / output terminal formed on the upper surface, the upper molding part upper part of the exterior member; Pouch type lithium secondary battery comprising a lower molding for protecting the lower portion of the pouch case. delete delete The method of claim 1, Pouch-type lithium secondary battery further comprises a lower molding for protecting the lower portion of the pouch packaging material. The method according to claim 1 or 4, The molding part is a pouch type lithium secondary battery, characterized in that formed using hot melt (hot melt). ` The method of claim 5, The hot melt is a pouch type lithium secondary battery, characterized in that the hot melt adhesive. The method of claim 6, The hot melt is selected from the group consisting of EVA (Ethylene-Vinyl Acetate copolymer) -based material, polyamide-based, polyester-based material, rubber-based material and polyurethane-based material Pouch type lithium secondary battery, characterized in that any one. The method of claim 1, A pouch type lithium secondary battery further comprising upper and lower insulating plates at upper and lower portions of the electrode assembly. The method of claim 1, The first pouch exterior material Deep, A heat seal layer formed on an upper surface of the core portion; A pouch type lithium secondary battery comprising an insulating film formed on a lower surface of the core portion. The method of claim 9, The core is made of aluminum (Al), The heat seal layer is made of a modified polypropylene, The insulating film is a pouch type lithium secondary battery, characterized in that made of any one of nylon or polyethylene terephthalate. The method of claim 1, The second pouch exterior material Materials and Pouch-type lithium secondary battery characterized in that it comprises a coating film coated on one surface of the substrate. The method of claim 11, The substrate is made of SUS (steel use stainless), The coating film is a pouch type lithium secondary battery, characterized in that made of any one of PP (Polypropylene) and PE (polyethylene). Preparing a pouch sheath having a first pouch sheath and a second pouch sheath, wherein one of the first pouch sheath and the second pouch sheath has a electrode assembly accommodation space; An electrode assembly including a first electrode plate with a first electrode tab, a second electrode plate with a second electrode tab, and a separator positioned between the first electrode plate and the second electrode plate in the electrode assembly accommodation space; Accommodating; Sealing the pouch sheath to form a pouch bare cell; Method of manufacturing a pouch-type lithium secondary battery comprising the step of winding the tubing around the entire space containing the electrode assembly by using a portion of the pouch case. The method of claim 13, The electrode assembly accommodating space is disposed on the left side or the right side of the first pouch packaging material, characterized in that the manufacturing method of the pouch type lithium secondary battery. The method of claim 13, Manufacturing a pouch type lithium secondary battery further comprises the step of electrically connecting a protective circuit module having an input and output terminal on the upper surface of the pouch packaging material with the first electrode tab and the second electrode tab. Way. The method of claim 15, Covering the upper portion of the protective circuit module using a hot melt, and further comprising the step of forming an upper molding portion of the upper portion of the exterior member to expose the input and output terminals formed on the upper surface of the pouch type lithium secondary battery Manufacturing method. The method of claim 13, The method of manufacturing a pouch type lithium secondary battery, further comprising the step of forming a lower molding part formed using hot melt. The method of claim 13, Forming a pouch bare cell by heat-sealing the pouch packaging material A first heat fusion step of covering and contacting the first pouch sheathing material using the second pouch sheathing material and forming a gas collecting space between the first and second pores and the first and second pores; Injecting and impregnating an electrolyte through the first through hole; A second heat fusion step of heat fusion bonding the first through hole; Collecting gas into the gas collecting space by initial charging and discharging; And a third heat fusion step of thermally fusion bonding the second through hole and the gas collection space. The method of claim 18, The first through hole is located on the opposite side of the electrode assembly receiving space of the edge of the gas collecting space is connected to the outside, And the second through hole is located between the electrode assembly accommodating space and the gas collecting space. Preparing a pouch case having a first pouch case and a second pouch case, wherein one of the first pouch case and the second pouch case has a first space and a second space; Receiving an electrode assembly in one of the first space and the second space; Thermally fusion bonding the first pouch case and the second pouch case together; Initially charging and discharging and collecting gas into one of the first space and the second space; Cutting between the first space and the second space to remove another space in which the gas is collected among the first space and the second space; Method of manufacturing a pouch-type lithium secondary battery comprising the step of winding the tubing around the entire space containing the electrode assembly by using a portion of the pouch case. The method of claim 20, The electrode assembly is accommodated in the first space, characterized in that the manufacturing method of the pouch type lithium secondary battery. The method of claim 20, Thermally fusion bonding the first pouch case and the second pouch case Forming a first moving path connecting the outside of the second space and the outside by heat-sealing a portion where the first pouch exterior material and the second pouch exterior material are in contact with each other, and forming a second moving path between the first space and the second space; The manufacturing method of the pouch type lithium secondary battery characterized by the above-mentioned. The method of claim 22, The first moving path is a manufacturing method of the pouch-type lithium secondary battery, characterized in that located on the opposite side of the first space of the second space is connected to the outside. The method of claim 20, Method of manufacturing a pouch-type lithium secondary battery further comprises the step of injecting an electrolyte. The method of claim 20, And electrically connecting a protection circuit module having an input / output terminal on the upper surface of the pouch case with the electrode assembly. The method of claim 25, Pouch-type lithium secondary battery further comprises the step of forming an upper upper molding portion covering the upper portion of the protection circuit module using a hot melt, and exposes the input and output terminals formed on the upper surface, the upper upper molding portion Method of preparation. The method of claim 20, The method of manufacturing a pouch type lithium secondary battery, further comprising the step of forming a lower molding part formed using hot melt.

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