KR20180107957A - Battery and method for manufcturing the same - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a secondary battery and a method of manufacturing the same, and more particularly, to a secondary battery utilized as a capacity of a secondary battery other than a minimum portion where the electrode leads are coupled, and a method of manufacturing the same.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a secondary battery,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a secondary battery and a method of manufacturing the same, and more particularly, to a secondary battery utilized as a capacity of a secondary battery other than a minimum portion where the electrode leads are coupled, and a method of manufacturing the same.

The pouch-type lithium secondary battery as a unit battery constituting the battery is relatively flexible in its shape, is light in weight, and has excellent safety, so that demand for portable electronic devices such as mobile phones, camcorders, and notebook computers is increasing.

The secondary battery may be classified into a cylindrical battery and a prismatic battery when the electrode assembly is housed in a cylindrical or rectangular metal can, and the electrode assembly may be a pouch type of aluminum laminate sheet When the battery is built in the case, it is classified as a pouch type battery.

Also, the electrode assembly incorporated in the battery case may include a positive electrode, a negative electrode, and a separator structure inserted between the positive electrode and the negative electrode, and can be charged / discharged. The electrode assembly may be a long sheet type anode coated with an electrode active material, A jelly-roll type in which a separator and a cathode are sequentially stacked and wound, and a stacked type in which a plurality of positive electrodes, a separator, and a negative electrode coated with an electrode active material are sequentially stacked.

The battery leads, which are respectively disposed on the negative electrode and the positive electrode of the electrode assembly, are passages through which charges charged in the battery move to the outside, and are coupled to the body through welding.

When the electrode assembly is coated with the electrode active material, the electrode assembly is not properly transferred due to the electrode active material coated with the frictional heat between the lead and the body, so that the welding is not smoothly performed.

Therefore, in order to perform the welding operation smoothly, a lead coupling area not coated with the electrode active material should be formed.

A conventional secondary battery in which the lead coupling region is formed will be described in detail with reference to FIG.

1 is a structural view of a conventional electrode assembly in a secondary battery.

Referring to FIG. 1, the electrode assembly includes a positive electrode coated with an electrode active material on the entire surface of a positive electrode sheet, and a negative electrode coated with an electrode active material on the entire surface of the negative electrode sheet.

A lead-coupling area not coated with an active material is formed at one end of the positive electrode and the negative electrode so as to be electrically connected to the positive electrode lead and the negative electrode lead constituting the electrode terminal of the secondary battery, respectively.

Since the lead-coupling region is formed up to a portion where each lead is not formed, there is a problem that the utilization of the secondary battery having a predetermined formation size is somewhat reduced.

Therefore, it is required to develop a technique for increasing the spatial utilization of the lead coupling region where the cathode lead and the cathode lead are coupled to the respective electrodes, as described above.

KR 2014-0064705 A

The present invention provides a secondary battery and a method of manufacturing the same, which increase the space utilization of a lead coupling region where the electrode active material in the secondary battery is not coated.

A secondary battery according to an embodiment of the present invention is a cylindrical secondary battery including an electrode assembly wound with a cathode / anode coated with an electrode active material and a separator laminated, and a case accommodating the electrode assembly, Wherein the anode of the electrode assembly includes a cathode lead end to which a cathode lead is coupled, and a cathode of the electrode assembly includes a cathode lead end to which the cathode lead is coupled, wherein a part of the cathode lead end is not coated with the electrode active material, And an electrode active material is applied to the remaining portion except for the positive electrode lead coupling region, and a portion of the negative electrode lead end portion is connected to the negative electrode lead portion where the electrode active material is not applied, A lead coupling region is formed, and in the remaining portion except for the cathode lead coupling region, The active material is applied.

The electrode active material applied to the positive electrode and the negative electrode of the electrode assembly is applied to one or both surfaces of the positive electrode and the negative electrode.

The method for manufacturing a secondary battery according to this embodiment of the present invention includes the steps of preparing an anode and a cathode by applying an electrode active material to a cathode sheet and a cathode sheet, A step of preparing an electrode assembly by laminating the positive electrode and the negative electrode prepared in the positive electrode and negative electrode preparation steps in the order of an anode, a cathode and a separator, and winding the electrode assembly, and an electrode assembly manufactured in the electrode assembly manufacturing step And a case assembling step of assembling the case.

The preparing step of the positive electrode and the negative electrode includes a step of applying an electrode active material to a remaining portion of the sheet roll except for a predetermined range of the sheet roll forming the positive electrode and the negative electrode, Forming a positive electrode or a negative electrode by cutting the sheet roll in accordance with the size of the positive electrode and the negative electrode and forming an electrode lead in each lead coupling region of the positive electrode or the negative electrode formed in the positive electrode or negative electrode forming step And a bonding electrode lead bonding step.

The positive electrode and negative electrode preparing steps may include a step of applying an electrode active material to a sheet roll forming the positive electrode and the negative electrode, a step of applying laser ablation to a part of the end of the sheet roll coated with the electrode active material, A step of removing the electrode active material, a step of forming a part of the end portion removed in the electrode active material removing step as a lead coupling region, cutting the sheet roll in accordance with the size of the anode and the cathode to form the anode and the cathode, And an electrode lead coupling step of coupling the electrode leads to the respective lead coupling regions of the positive and negative electrodes formed in the positive and negative electrode formation steps.

The secondary battery according to the third embodiment of the present invention is characterized in that the pouch type secondary battery includes an electrode assembly in which a plurality of positive electrode / negative electrode and separator coated with an electrode active material are stacked, and the positive electrode of the electrode assembly has a positive electrode lead Wherein a cathode lead of the electrode assembly includes a cathode lead end to which a cathode lead is coupled, and a part of the cathode lead end is connected to a cathode lead coupling And an electrode active material is applied to the remaining portions except for the positive electrode lead coupling region. A portion of the negative electrode lead end portion forms a negative electrode lead coupling region in which the negative electrode lead is contacted without being coated with the electrode active material, The electrode active material is applied to the remaining portion except for the bonding region.

A method of manufacturing a secondary battery according to an embodiment of the present invention includes the steps of applying an electrode active material to a sheet roll for forming an anode and a cathode in an electrode active material applying step, A step of removing the electrode active material to perform laser ablation on a central portion of the sheet roll to which the active material is applied; a step of forming a part of the electrode active material removing step in the step of removing the electrode active material from the positive electrode tab and the negative electrode tab, Forming a positive electrode and a negative electrode by cutting the sheet roll according to a size of the positive electrode and the negative electrode, and forming a pouch cell by using the positive and negative electrodes formed in the positive and negative electrode forming steps.

The pouch-cell forming step may include an electrode assembly manufacturing step for manufacturing an electrode assembly by laminating a plurality of pores in the order of the anode, the separator, and the cathode, and a lead welding step for welding the leads to the electrode assembly assembled in the electrode assembly manufacturing step .

The secondary battery according to the embodiment of the present invention and the method of manufacturing the same may reduce the size of the lead coupling region where the electrode active material is not coated, thereby increasing the capacity of the secondary battery.

1 is a structural view of a conventional electrode assembly in a secondary battery.
2 is a structural view of a secondary battery according to an embodiment of the present invention;
3 is a structural view of an electrode assembly in a secondary battery according to an embodiment of the present invention.
4 is a flowchart of a method for manufacturing a secondary battery according to this embodiment of the present invention.
5 is a schematic view of a preparation step of an anode and a cathode in a method of manufacturing a secondary battery according to this embodiment of the present invention.
FIG. 6 is a schematic view of another positive electrode and negative electrode preparation steps of a method of manufacturing a secondary battery according to this embodiment of the present invention. FIG.
7 is a schematic view of a method of manufacturing a secondary battery according to a fourth embodiment of the present invention.
FIG. 8 is a flowchart of a pouch cell forming step in a method of manufacturing a secondary battery according to a fourth embodiment of the present invention. FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to or limited by the embodiments. Only embodiments are provided so that this disclosure will be thorough and complete and will fully convey the scope of the invention to those skilled in the art.

Also, terms including ordinal numbers such as first, second, etc. may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of identifying one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. Also, in certain cases, there may be a term selected arbitrarily by the applicant, in which case the meaning thereof will be described in detail in the description of the corresponding invention. Therefore, the term used in the present invention should be defined based on the meaning of the term, not on the name of a simple term, but on the entire contents of the present invention.

≪ Example 1 >

Next, a secondary battery according to an embodiment of the present invention will be described.

The secondary battery according to an embodiment of the present invention is a cylindrical model and reduces the size of the lead coupling area where the electrode active material is not applied to the positive electrode and the negative electrode in a predetermined range so that the capacity of the secondary battery can be increased.

2 is a structural view of a secondary battery according to an embodiment of the present invention.

Referring to FIG. 2, a secondary battery 100 according to an embodiment of the present invention is a cylindrical secondary battery. The secondary battery 100 includes an electrode assembly 200 in which a positive electrode / negative electrode coated with an electrode active material and a separator are laminated, And a case 300 in which the case 200 is housed.

Further, each configuration of the electrode assembly will be described in more detail with reference to FIG.

3 is a structural view of an electrode assembly in a secondary battery according to an embodiment of the present invention.

3, the electrode assembly 200 includes a positive electrode 210 and a negative electrode 230 coated with an electrode active material, and a separator 220 wound in a laminated state. More precisely, the positive electrode 210, The separator 220 and the cathode 230 are sequentially laminated.

The anode 230 of the electrode assembly includes a cathode lead 210 having a cathode lead 212 to which the cathode lead 212 is connected, (Not shown)

A part of the positive electrode lead portion (not shown) forms a positive electrode lead coupling region 211 in which the positive electrode lead 212 is in contact with and contacts the remaining portion except for the positive electrode lead coupling region, A part of an end portion (not shown) forms a negative electrode lead coupling region 231 to which the negative electrode lead 232 is brought into contact and is connected. The remaining portion except for the negative electrode lead coupling region 231 is coated with an electrode active material.

More specifically, the positive electrode lead 212 is coupled to the positive electrode lead coupling region 211 of the electrode assembly 200 and the negative electrode lead 232 is coupled to the negative electrode lead coupling region 231. Each of the leads thus formed forms a passage of electrons to allow current to flow.

The positive electrode lead coupling region 211 and the negative electrode lead coupling region 231 are formed to have lengths of 50% or less of the widths of the positive and negative electrodes and have widths of 10% or less of the lengths of the positive and negative electrodes, The capacity of the secondary battery can be increased more than the structure in which the lead coupling region is formed on the vertical front surface as in the prior art.

The electrode active material is applied to one side or both sides of the anode 210 and the cathode 230 by coating the anode active material and the cathode active material on the respective sheets.

The case 300 is formed in a cylindrical shape so that the wound electrode assembly can be inserted.

≪ Example 2 >

Next, a method for manufacturing a secondary battery according to this embodiment of the present invention will be described.

The method for manufacturing a secondary battery according to this embodiment of the present invention is a method for manufacturing a secondary battery according to the present invention, in which an electrode active material is applied to a region except for a lead coupling region within a predetermined range of an electrode sheet in a cylindrical secondary battery or an electrode active material- So that the capacity of the secondary battery can be increased more than the conventional one.

4 is a flowchart of a method for manufacturing a secondary battery according to this embodiment of the present invention.

Referring to FIG. 4, a method of manufacturing a secondary battery according to an embodiment of the present invention includes preparing a positive electrode and a negative electrode by applying an electrode active material to a positive electrode sheet and a negative electrode sheet, .

The anodes and cathodes prepared in the anode and cathode preparation steps S410 are stacked in the order of the anode 210, the separator 220 and the cathode 230 and then rolled up to manufacture the electrode assembly 200 : S420).

Also, the electrode assembly 200 manufactured in the electrode assembly manufacturing step (S420) is assembled to the case 300 (case assembling step: S430).

Each step of the secondary battery manufacturing method will be described in more detail below.

The anode and cathode preparation step S410 is a step of preparing an anode and a cathode by applying an electrode active material to a cathode sheet and a cathode sheet, and joining the electrode tabs, and will be described in detail with reference to FIG. 5 and FIG.

5 is a schematic view of a preparation step of a positive electrode and a negative electrode in a method of manufacturing a secondary battery according to this embodiment of the present invention.

Referring to FIG. 5, the anode and cathode preparation steps (S410) apply the electrode active material to the rest of the sheet roll except for a predetermined range of the sheet roll (anode active material coating step S411_1).

In the electrode active material applying step S411_1, a predetermined range in which the electrode active material is not applied is formed as a lead coupling region, and the sheet roll is cut in accordance with the size of the anode and the cathode to form the anode or the cathode Step S412_1).

In addition, the electrode leads are coupled to the respective lead coupling regions of the positive electrode or the negative electrode formed in the positive electrode or negative electrode formation step S412_1 (electrode lead coupling step: S413_1).

Such a method of preparing the positive electrode and the negative electrode is a method in which the electrode active material is not applied to the predetermined lead bonding region when the electrode active material is applied.

More specifically, the electrode active material applying step S411_1 is a step of applying an electrode active material to the rest of the sheet roll except for a predetermined range of the sheet roll forming the positive electrode and the negative electrode, and the electrode active material is generally a lithium cobalt oxide (Anode) and carbon and silicon oxide (cathode), respectively, one electrode (anode or cathode) sheet roll is manufactured for the convenience of manufacturing.

Therefore, in the conventional method of forming one side of the anode and the cathode according to the vertical length as the lead coupling region, the capacity of the secondary battery can be increased as the lead coupling region is reduced in a predetermined range.

In the positive electrode and negative electrode forming step S412_1, a predetermined range in which the electrode active material is not applied is formed as a lead coupling region in the electrode active material applying step S411_1, and the sheet roll is cut in accordance with the size of the positive electrode and the negative electrode, Or a cathode.

In addition, the shape of the sheet roll to be cut is cut so that the lead-joining area is located at the predetermined position in accordance with the pre-designated anode and cathode sizes.

The lead-coupling region in the positive electrode and negative electrode formation step (S412_1) is formed to have a length within 50% of the transverse lengths of the positive electrode and the negative electrode, and is formed to have a width within 10% of the longitudinal lengths of the positive electrode and the negative electrode .

In addition, the electrode lead coupling step S413_1 is a step of coupling the electrode leads to the respective lead coupling regions of the positive electrode or the negative electrode formed in the positive electrode or negative electrode formation step S412_1, and each coupled lead forms an electron passage Allow current to flow.

FIG. 6 is a schematic view of another positive electrode and negative electrode preparation steps of the method for manufacturing a secondary battery according to this embodiment of the present invention.

Referring to FIG. 6, the anode and cathode preparation steps (S410) include applying an electrode active material to the sheet rolls forming the anode and the cathode (applying the electrode active material: S411_2) Laser ablation is performed (electrode active material removal step: S412_2).

In addition, a portion of the end removed in the electrode active material removing step S412_2 is formed as a lead coupling region, and the sheet roll is cut according to the size of the anode and the cathode to form the anode and the cathode (S413_2 ).

The electrode leads are coupled to the respective lead coupling regions of the positive electrode and the negative electrode formed in the positive electrode and negative electrode formation step S413_2 (electrode lead coupling step: S414_2).

As described above, another method of preparing the positive electrode and the negative electrode is a method of applying the electrode active material to the entire sheet roll, and removing the electrode active material only in a predetermined range to form the lead coupling region.

In more detail, the electrode active material applying step S411_2 is a step of applying an electrode active material to the entire surface of the sheet roll forming the positive electrode and the negative electrode, and the electrode active material is generally composed of a lithium cobalt oxide (anode) And a silicon oxide (cathode). Therefore, one electrode (anode or cathode) sheet roll is manufactured for the convenience of the manufacturing process.

Therefore, in the conventional method of forming one side of the anode and the cathode according to the vertical length as the lead coupling region, the capacity of the secondary battery can be increased as the lead coupling region is reduced in a predetermined range.

In the step of removing the electrode active material (S412_2), laser ablation is performed so that the electrode active material is removed from a part of the end of the sheet roll coated with the electrode active material.

This can reduce the area where the electrode active material is removed from the end portion of the sheet roll in the conventional method of removing the electrode active material on the longitudinal side of the sheet roll, thereby increasing the capacity of the secondary battery.

A portion of the end of the sheet roll in the electrode active material removing step S412_2 is formed to have a length within 50% of the transverse lengths of the anode and the cathode, and is formed to have a width within 10% of the longitudinal lengths of the anode and the cathode .

In the positive electrode and negative electrode forming step S413_2, a portion of the end removed in the electrode active material removing step S412_2 is formed as a lead coupling region, and the sheet roll is cut in accordance with the size of the positive electrode and the negative electrode, .

In addition, the shape of the sheet roll to be cut is cut so that the lead-joining area is located at the predetermined position in accordance with the pre-designated anode and cathode sizes.

In addition, the electrode lead coupling step S414_2 is a step of coupling the electrode leads to the respective lead coupling regions of the positive electrode or the negative electrode formed in the positive electrode or negative electrode formation step S413_2, and each coupled lead forms an electron passage Allow current to flow.

≪ Example 3 >

Next, the secondary battery according to the third embodiment of the present invention will be described.

The secondary battery according to the third embodiment of the present invention is a pouch-type model in which a lead coupling region in which an electrode active material is not coated in a predetermined range is formed on the positive electrode and the negative electrode so that the capacity of the secondary battery can be increased.

The secondary battery according to the third embodiment of the present invention is a pouch type secondary battery comprising an electrode assembly in which a plurality of positive electrode / negative electrode and separator coated with an electrode active material are stacked.

Further, each configuration of the electrode assembly will be described in more detail below.

The electrode assembly has a structure in which a plurality of positive electrode / negative electrode and separator coated with an electrode active material are stacked, and more precisely, a plurality of positive electrodes, a separator, and a negative electrode are sequentially stacked.

The cathode of the electrode assembly includes a cathode lead end to which the cathode lead is coupled, and a cathode of the electrode assembly includes a cathode lead end to which the cathode lead is defective,

A portion of the cathode lead end portion forms a cathode lead coupling region in which the cathode lead is brought into contact with and contacts with the electrode active material except for the cathode lead coupling region, And the electrode active material is applied to the remaining portions except for the cathode lead coupling region.

More precisely, a positive electrode lead is coupled to the positive electrode lead coupling region of the electrode assembly, and a negative electrode lead is coupled to the negative electrode lead coupling region. Each of the leads thus formed forms a passage of electrons to allow current to flow.

In addition, the positive electrode lead coupling region and the negative electrode lead coupling region form a width within 40% of the width of the positive electrode and the negative electrode and have a length within 20% of the vertical length of the positive electrode and the negative electrode, So that the capacity of the secondary battery can be increased more than the structure in which the lead coupling region is formed on the transverse entire surface.

Further, when the electrode active material is applied to the sheet roll, the electrode active material is not applied in a predetermined range which forms the lead-joining region, or the electrode active material is removed by a predetermined range forming the lead joining region on the sheet roll on which the electrode active material is coated, So that a coupling region and a negative electrode lead coupling region can be formed.

The electrode active material is generally composed of a lithium cobalt oxide (anode), carbon and silicon oxide (cathode), and is coated on one or both surfaces of the anode and cathode sheets.

<Example 4>

Next, a secondary battery manufacturing method according to one embodiment of the present invention will be described.

The method of manufacturing a secondary battery according to the fourth embodiment of the present invention is a method of manufacturing a secondary battery according to a second embodiment of the present invention in which an electrode active material is applied to a region excluding a lead coupling region within a predetermined range or an electrode active material is coated on an electrode active material, So that the capacity of the battery can be increased.

7 is a schematic view of a method of manufacturing a secondary battery according to a fourth embodiment of the present invention.

Referring to FIG. 7, a method of manufacturing a secondary battery according to an embodiment of the present invention includes applying an electrode active material to a sheet roll forming an anode and a cathode (coating an electrode active material: S710) Laser ablation is performed on a central portion (electrode active material removal step: S720).

A portion removed in the electrode active material removing step S720 is formed as a lead coupling region, and the sheet roll is cut according to the size of the positive electrode tab and the negative electrode tab coupled to the lead coupling region (step S730).

In addition, each sheet cut in the sheet roll cutting step S730 is used as an anode and a cathode to form a pouch cell (pouch cell forming step: S740).

Each step of the secondary battery manufacturing method will be described in more detail below.

The electrode active material applying step (S710) is a step of applying an electrode active material to a sheet roll forming the positive electrode and the negative electrode, and coating the electrode active material on the entire sheet roll.

In addition, since the electrode active material is generally composed of lithium cobalt oxide (anode) and carbon and silicon oxide (cathode), one electrode (anode or cathode) sheet roll is manufactured for the convenience of manufacturing.

In the step of removing the electrode active material (S720), laser ablation is performed so that the electrode active material is removed from a central portion of the sheet roll coated with the electrode active material.

This allows the capacity of the secondary battery to be increased by reducing the area where the electrode active material is removed from the central portion of the sheet roll in the conventional method of removing the electrode active material by one line in the longitudinal direction of the sheet roll.

Also, the sheet roll cutting step S730 may include forming the lead removed portion in the electrode active material removing step S720, and cutting the sheet roll according to predetermined anode and cathode sizes. More precisely, cut the tabs so that each tab is at the predefined position in accordance with the predetermined anode and cathode sizes.

The pouch cell forming step S740 is a step of forming a pouch cell by using each sheet cut in the sheet roll cutting step S730 as an anode and a cathode, and will be described in detail with reference to FIG.

FIG. 8 is a flow chart of a pouch cell forming step in a method of manufacturing a secondary battery according to a fourth embodiment of the present invention.

Referring to FIG. 8, in the pouch cell forming step S740, a plurality of positive electrodes and negative electrodes cut in the sheet roll cutting step S730 are stacked in the order of anodes, separators, and cathodes to manufacture an electrode assembly Manufacturing step: S741).

The leads are welded to the assembled electrode assembly in the electrode assembly manufacturing step S741 (lead welding step: S742).

The step of forming the electrode assembly (S741) further comprises laminating a plurality of the positive electrode, the separator, and the negative electrode in the order of the positive electrode, the separator, and the negative electrode, Thereby forming a negative electrode tab connected to a plurality of cathodes.

Further, in the lead welding step S742, the lead is welded to the electrode assembly assembled in the electrode assembly manufacturing step (S741). More specifically, the lead corresponding to each pole is welded to the positive electrode tab and the negative electrode tab .

These combined taps and leads form an electron path to allow current to flow.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention.

100: secondary battery
200: electrode assembly
210: anode
211: Positive electrode lead coupling area
212: positive lead
220: Membrane
230: cathode
231: Negative electrode lead coupling area
232: negative lead
300: Case

Claims (8)

In a cylindrical secondary battery,
An electrode assembly in which a positive electrode / negative electrode coated with an electrode active material and a separator are laminated; And
A case in which the electrode assembly is accommodated; And,
The positive electrode of the electrode assembly includes a positive electrode lead end to which the positive electrode lead is coupled, and the negative electrode of the electrode assembly includes a negative electrode lead end to which the negative electrode lead is coupled,
A part of the cathode lead end portion forms a cathode lead coupling region where the electrode active material is not applied and the cathode lead is in contact with the electrode lead portion and the electrode active material is applied to the remaining portion except for the cathode lead coupling region, Wherein the electrode active material is applied to the remaining portion except the negative electrode lead coupling region and the negative electrode lead coupling region where the electrode active material is not applied and the negative electrode lead is contacted and bonded.
The method according to claim 1,
Wherein the electrode active material applied to the positive electrode and the negative electrode of the electrode assembly is applied to one or both surfaces of the positive electrode and the negative electrode.
A method of manufacturing a cylindrical secondary battery,
Preparing a positive electrode and a negative electrode by applying an electrode active material to a positive electrode sheet and a negative electrode sheet, and bonding the electrode tabs to prepare a positive electrode and a negative electrode;
A step of preparing an electrode assembly by laminating the positive electrode and the negative electrode prepared in the preparing steps of the positive electrode and the negative electrode in the order of an anode, a cathode and a separator, and winding the same; And
A case assembly step of assembling the electrode assembly manufactured in the electrode assembly manufacturing step into a case;
And forming a second electrode on the second electrode.
The method of claim 3,
The anode and cathode preparation steps may include:
Applying an electrode active material to a portion of the sheet roll forming the positive electrode and the negative electrode except for a predetermined range;
Forming a positive electrode or a negative electrode by forming a predetermined range in which the electrode active material is not applied in the electrode active material application step as a lead coupling region and cutting the sheet roll in accordance with the size of the positive electrode and the negative electrode to form a positive electrode or a negative electrode; And
An electrode lead bonding step of bonding the electrode leads to the respective lead bonding areas of the positive electrode or the negative electrode formed in the positive electrode or negative electrode forming step;
And forming a second electrode on the second electrode.
The method of claim 3,
The anode and cathode preparation steps may include:
Applying an electrode active material to an electrode active material on a sheet roll forming an anode and a cathode;
An electrode active material removing step of performing laser ablation on a part of an end of the sheet roll coated with the electrode active material in the electrode active material applying step;
Forming a positive electrode and a negative electrode by forming a portion of the end removed in the electrode active material removal step as a lead bonding region and cutting the sheet roll in accordance with the sizes of the positive electrode and the negative electrode to form the positive electrode and the negative electrode; And
An electrode lead bonding step of bonding the electrode leads to the respective lead coupling regions of the positive electrode and the negative electrode formed in the positive electrode and negative electrode formation steps;
And forming a second electrode on the second electrode.
In the pouch type secondary battery,
An electrode assembly in which a plurality of anode / cathode and separator coated with an electrode active material are laminated; And,
The positive electrode of the electrode assembly includes a positive electrode lead end to which the positive electrode lead is coupled, and the negative electrode of the electrode assembly includes a negative electrode lead end to which the negative electrode lead is coupled,
A part of the cathode lead end portion forms a cathode lead coupling region where the electrode active material is not applied and the cathode lead is in contact with the electrode lead portion and the electrode active material is applied to the remaining portion except for the cathode lead coupling region, Wherein the electrode active material is applied to the remaining portion except the negative electrode lead coupling region and the negative electrode lead coupling region where the electrode active material is not applied and the negative electrode lead is contacted and bonded.
A method of manufacturing a pouch type secondary battery,
Applying an electrode active material to an electrode active material on a sheet roll forming an anode and a cathode;
An electrode active material removing step of performing laser ablation on a central portion of the sheet roll coated with the electrode active material in the electrode active material applying step;
A positive electrode and a negative electrode forming step of forming a positive electrode and a negative electrode by forming a part of the electrode tab and the negative electrode tab removed in the step of removing the electrode active material and cutting the sheet roll according to the sizes of predetermined positive and negative electrodes; And
A pouch cell forming step of forming a pouch cell using the positive and negative electrodes formed in the positive and negative electrode forming steps;
And forming a second electrode on the second electrode.
The method of claim 7,
The pouch-cell forming step may include:
An electrode assembly manufacturing step of fabricating an electrode assembly by laminating a plurality of electrodes in the order of an anode, a separator, and a cathode; And
A lead welding step of welding the leads to the electrode assembly assembled in the electrode assembly manufacturing step;
And forming a second electrode on the second electrode.

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