KR20210001093A - Electrode assembly and manufacturing method thereof - Google Patents

Abstract

The present invention provides a method for manufacturing an electrode assembly, which is manufactured by winding a negative electrode, a separator, and a positive electrode around a winding core, includes: a negative electrode rotating step (S1) of fixing a starting terminal of a negative electrode to a winding core and rotating the winding core; a first separator introducing step (S2) of introducing a first separator to rotate together with the negative electrode after the negative electrode starts to rotate (S2); a second separator introducing step (S3) of introducing a second separator to rotate together with the first separator after the first separator starts to rotate; and a positive electrode inputting step (S4) of introducing a positive electrode between the first separator and the second separator such that the positive electrode rotates together after the second separator starts to rotate. According to the present invention, the electrode assembly, in which a negative electrode, a separator, and a positive electrode are wound while being stacked, includes: a negative electrode wound such that a starting terminal for starting winding is placed in the center; a first separator wound such that a starting terminal for starting winding is placed at an outer portion of the starting terminal of the negative electrode; a second separator wound such that a starting terminal for starting winding is placed at an outer portion of the starting terminal of the first separator; and a positive electrode wound such that a starting terminal for starting winding is interposed between the first separator and the second separator.

Description

Electrode assembly and manufacturing method thereof TECHNICAL FIELD

The present invention relates to an electrode assembly and a method of manufacturing the same, and more particularly, a negative electrode terminal can be formed at the center of the electrode assembly without separately providing a negative electrode tab on the outer circumferential surface of the electrode assembly. The present invention relates to a jelly roll type electrode assembly capable of solving a conventional problem (stress generation in a negative electrode) that may be caused by this, and a method of manufacturing the same.

Batteries that store electrical energy may generally be classified into primary batteries and secondary batteries. While the primary battery is a disposable consumable battery, the secondary battery is a rechargeable battery manufactured using a material capable of repeating oxidation and reduction processes between current and material. That is, when a reduction reaction is performed on the material by electric current, power is charged, and when an oxidation reaction is performed on the material, the power is discharged. Such charge-discharge can be repeatedly performed.

Among various types of secondary batteries, lithium secondary batteries are generally manufactured by mounting an electrode assembly in which a cathode, a separator, and an anode are stacked on a case, and lithium ions are obtained from the lithium metal oxide of the positive electrode. As the process of intercalation and deintercalation is repeated, charging and discharging of the lithium secondary battery proceeds.

Meanwhile, as a method of manufacturing the electrode assembly, a winding type manufactured by stacking and winding a separator between the cathode and the anode, cutting the cathode and anode by cutting to have a required width and length, and cutting the cathode and the anode, the cathode and the separator , A stacked type manufactured by stacking an anode repeatedly, and a stacked type manufactured by folding from one side after placing unit cells side by side on a folding separator are known.

Among them, the winding type (jelly roll type) electrode assembly is manufactured by connecting an anode, a separator, and a cathode to a core, and winding the anode, a separator, and a cathode along the periphery of the core by rotating the core.

At this time, as shown in Fig. 1A, which shows the state that the separators 1a and 1b are first inserted and fixed to the core according to the conventional manufacturing method, in the manufacturing method of the conventional electrode assembly, two sheets of separators 1a and 1b It is configured to rotate the core in a state where the start end (the end at which winding starts) of 1b) is overlapped and fixed to the core, and then the cathode 2 is inserted, and then the anode 3 is introduced at a time difference ( In Fig. 1b, it is shown that a space is provided inside while the cathode, the separator, and the anode are rotated, but this is intentionally separated from each other as lines become difficult to identify when attached to the drawing. During this process, the cathode, the separator, and the anode are wound in a tightly closed cylindrical shape).

Therefore, when the core is rotated by a predetermined number of rotations while the anode 3 is inserted, the separators 1a and 1b are located at the center as shown in FIG. 1B, which shows the shape of the conventional jelly roll type electrode assembly. The start end is located and the start end of the cathode 2 is located further outside the start end of the separation membrane 1a, 1b from the center, and the start end of the anode 3 is further outside the start end of the cathode 2 It has a structure in which it is located.

On the other hand, in the electrode assembly wound in a cylindrical shape as described above, the negative electrode tab (not shown) and the positive electrode tab (not shown) are pre-processed at the ends of each of the negative electrode 2 and the positive electrode 3 (the opposite end of the start). do. In addition, when the electrode assembly is inserted into the cylindrical can, the positive electrode tab is connected to a top cap coupled to an upper end of the can, and the negative electrode tab is connected to a bottom surface of the can.

However, processing the negative electrode tab and the positive electrode tab separately not only increases production time and production cost, but also has a problem that welding becomes difficult when welding to the top cap and the can, respectively, as the negative electrode tab and the positive electrode tab are disposed close to each other. Accordingly, there is a need to space the positive electrode tab and the negative electrode tab as far apart as possible.

In addition, when the cathode 2 is wound first, and then the anode 3 is wound next, the portion where the start end of the anode 3 is placed acts as an external pressure on the cathode 2. That is, when winding is performed in a state where a certain tension is applied, the thickness to be wound increases when the anode 3 is input, and the starting end of the anode 3 serving as the boundary acts as a stress on the cathode 2.

Accordingly, when the starting end of the anode 3 is input, there is a possibility that deformation may occur at a corresponding point where the stacking is performed at the cathode 2. Therefore, there is a need to alleviate the stress applied to the cathode 2 in this way.

Accordingly, the present invention maintains its original position (the end of the positive electrode) so that the positive electrode tab and the negative electrode tab can be relatively farther apart in order to solve the problems of the conventional structure, but the negative electrode tab is moved to the center of the electrode assembly. The main purpose is to provide an electrode assembly and a method of manufacturing the same that can be moved and positioned, and that stress applied to the negative electrode when the positive electrode is introduced can be minimized.

The method of manufacturing an electrode assembly according to the present invention for achieving the above object is a method of manufacturing a jelly roll-type electrode assembly manufactured by winding a cathode, a separator, and an anode from a winding core, wherein the starting end of the negative electrode is fixed to the winding core, and the Cathode rotation step (S1) of rotating the core; A first separation membrane input step (S2) of injecting a first separation membrane to rotate with the cathode after rotation of the cathode starts; A second separation membrane input step (S3) of injecting a second separation membrane to rotate with the first separation membrane after the rotation of the first separation membrane starts; And an anode injection step (S4) of introducing an anode between the first and second separators so that the anode rotates together after the rotation of the second separator starts.

In addition, before the anode injection step (S4), a protective tape is attached to a predetermined region of the first separator or the second separator so that lamination is performed at a portion where the start end of the anode will be located.

The protective tape is adhered such that the adhesive surface on which the adhesive component is applied is adhered to the first separator or the second separator, and the opposite surface is in contact with the anode.

In another embodiment, prior to the positive electrode insertion step (S4), a protective tape may be attached, but the protective tape may be attached to a predetermined region of the negative electrode so as to be laminated at a portion where the start end of the positive electrode will be located.

In another embodiment, a protective tape is attached to the starting end of the positive electrode before the positive electrode injection step (S4), and the positive electrode may be injected while the protective tape is attached. At this time, the protective tape may be attached to cover both surfaces of the starting end of the positive electrode.

Meanwhile, the protective tape is preferably made of a material having higher elasticity than that of the positive electrode.

In addition, when the first and second separators are introduced, the rotational speed of the core may be temporarily slowed, and when the anode is input, the rotational speed of the core may be temporarily slowed.

In addition, the present invention additionally provides an electrode assembly that can be manufactured through the manufacturing method as described above. The jelly roll-type electrode assembly according to the present invention includes: a negative electrode wound so that a start end at which the winding starts is placed in the center; A first separator wound so that a start end from which winding is started is disposed on an outer side of the cathode than the start end of the cathode; A second separator wound so that a start end from which winding is started is located on an outer side of the first separator; And an anode wound so that a start end from which winding is started is placed between the first separator and the second separator.

A protective tape is inserted in a predetermined area between the cathode and the second separator or between the anode and the first separator, and the protective tape is stacked from the inside (toward the center) or outside (the side away from the center) of the starting end of the anode. It is positioned so that it is done.

Alternatively, the protective tape may have a protective tape attached to the starting end of the positive electrode, but the protective tape may be attached to cover both surfaces of the starting end of the positive electrode.

The method of manufacturing an electrode assembly of the present invention having the above-described configuration can provide an electrode assembly in which a cathode is located in the center. Accordingly, since the negative electrode tab electrically connecting the negative electrode to the outside of the electrode assembly may be formed in the center of the electrode assembly, the distance to the positive electrode tab increases, so that welding can be performed more easily. In addition, in the conventional structure, the anode tab is welded at a position skewed toward one side from the center of the can, but in the structure of the present invention, the cathode tab is welded at the center of the can, thereby providing a more stable structure. In addition, the metal pin may be used as a negative electrode tab by inserting a metal pin or the like at the beginning of the negative electrode.

In addition, in the present invention, a protective tape is provided so as to be stacked at a position where the starting end of the anode is placed or to surround the starting end of the anode so as to relieve stress applied to the cathode.

The protective tape is composed of one (or both) of the adhesive surface, so that it can be easily attached, and it is made of a material having sufficient elasticity, so that the stress applied to the negative electrode can be relieved through elastic deformation of the material (ie, It is possible to increase the performance and safety of the electrode assembly by suppressing the decrease in tensile strength and elongation of the electrode current collector and suppressing the progress of deformation).

And, in the present invention, when the first separator and the second separator are inserted and when the anode is inserted, the rotational speed of the winding core is temporarily slowed, so that the injection can be made at a precise time point, and the impact generated by the starting end of the anode can be minimized. I can.

1A is a view showing a state in which a separator is first inserted and fixed to a winding core according to a conventional manufacturing method, and then a cathode and an anode are sequentially introduced.
FIG. 1B is a view showing a state of being manufactured as an electrode assembly by rotating the core in the state of FIG. 1A.
Figure 2 is a flow chart showing each step of the manufacturing method according to the present invention.
3 is a view showing a state in which a cathode, a first separator, a second separator, and an anode are introduced into the core in order according to the manufacturing method of the present invention.
4 is a view showing a state of being manufactured as an electrode assembly according to the first embodiment by rotating the core in the state of FIG. 3.
5 is a diagram illustrating a state in which a protective tape is stacked between a cathode and a first separator according to a second embodiment.
6 is a view showing a state in which a protective tape is stacked between an anode and a second separator according to a third embodiment.
7 is a view showing a state in which a protective tape is stacked between a cathode and a second separator according to a fourth embodiment.
8 is a view showing a state in which a protective tape is attached to cover both sides of a starting end of an anode according to a fifth embodiment.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art can easily implement the present invention. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein.

In order to clearly describe the present invention, parts irrelevant to the description have been omitted, and the same reference numerals are assigned to the same or similar components throughout the specification.

In addition, terms or words used in the present specification and claims should not be construed as being limited to their usual or dictionary meanings, and the inventor appropriately defines the concept of terms in order to describe his own invention in the best way. It should be interpreted as a meaning and concept consistent with the technical idea of the present invention based on the principle that it can be done.

In the present invention, a negative electrode tab can be placed in the center of the electrode assembly, and a method of manufacturing an electrode assembly capable of alleviating stress applied to the negative electrode by the starting end of the positive electrode and an electrode assembly that can be manufactured through the above manufacturing method. In the following, with reference to the accompanying drawings, the present invention will be described in more detail.

Method of manufacturing electrode assembly

The manufacturing method of the electrode assembly according to the present invention is a method of manufacturing a jelly roll type electrode assembly manufactured by winding the cathode 20, the separators 10: 10a, 10b, and the anode 30 in the winding core 50. Referring to FIG. 2 showing each step of the manufacturing method according to the present invention, in the present invention, the cathode rotation step (S1) in which the cathode 20 is first inserted and rotated, and the first separation membrane into which the first separation membrane 10a is introduced. It includes an input step (S2), a second separation membrane input step (S3) in which the second separator 10b is introduced, and an anode injection step (S4) in which the anode 30 is introduced.

In the cathode rotation step (S1), as shown in FIG. 3, a cathode 20, a first separator 10a, a second separator 10b, and an anode 30 are introduced into the winding core 50 in this order. Likewise, the cathode 20 is first fixed to the winding core 50, and the winding core 50 is rotated while the starting end of the cathode 20 is fixed. In addition, in the first separation membrane input step (S2), after the rotation of the cathode 20 is started at the winding core 50, the first separation layer 10a is introduced so that it rotates with the cathode 20, and then a predetermined parallax is adjusted. Then, the second separation membrane input step (S3) is performed. In the second separation membrane input step (S3), after the rotation of the first separation membrane 10a is started, the second separation membrane 10b is introduced at a predetermined time difference so as to rotate with the first separation membrane 10a.

In addition, after the second separation layer 10b is introduced, the anode injection step (S4) proceeds with a predetermined time difference. In the anode injection step (S4), after the rotation of the second separator 10b starts, the anode 30 is inserted between the first separator 10a and the second separator 10b so that the anode 30 rotates together. It is done.

As above, when the cathode 20, the first separator 10a, the second separator 10b, and the anode 30 are inserted at a time difference and then the core 50 is rotated by a predetermined number of rotations (or a predetermined rotation) When the number of rotations is made and the cut is made), as shown in FIG. 4, which shows a state of the winding core being rotated in the state of FIG. 3 to be manufactured as an electrode assembly, the electrode assembly has a circular shape as a whole, and the cathode 20 This starting end is in a wound state.

Further, from the start end of the cathode 20 located at the center to the outside, the first separation layer 10a is disposed in the order of the start end of the anode 30 and the second separation layer 10b. In this case, the starting end of the second separation layer 10b may have the same distance from the starting end of the cathode 20 toward the outer side according to the distance from the starting end of the anode 30. That is, in FIG. 4, the start end of the second separator 10b is shown to be spaced apart from the first separator 10a, but in reality, the first separator 10a is in front of the start end of the anode 30 (left side in the drawing). Becomes attached to. Accordingly, the distance from the start end of the cathode 20 to the outer side of the second separation layer 10b may be the same as the distance from the start end of the cathode 20 to the start end of the anode 30 toward the outer side. .

In addition, in the manufacturing method of the present invention, as shown in FIG. 2, the step of attaching the protective tape 40 may be optionally further added. The protective tape 40 is preferably made of a material having higher elasticity than the anode 30, and before the cathode rotation step (S1), the cathode 20, the separator 10: 10a, 10b, and the anode 30 are When each is manufactured, it may be attached to a predetermined position or may be attached to the anode 30 before the anode injection step (S4).

In the present invention, when the positive electrode 30 is additionally laminated, the protective tape 40 has a function of suppressing or alleviating the stress generated in the laminated portion of the negative electrode 20 caused by the starting end of the positive electrode 30. to provide.

That is, the protective tape 40 is attached to a predetermined region of the first separator 10a or the second separator 10b so that stacking is performed at a portion where the start end of the anode 30 will be located. At this time, the protective tape 40 may be adhered such that the adhesive surface on which the adhesive component is applied on one or both surfaces is adhered to the first separator 10a or the second separator 10b, and the opposite side is in contact with the anode 30. In addition, it may be attached at a preselected position while the first separation membrane 10a or the second separation membrane 10b is being manufactured, or while being supplied before the first separation membrane 10a or the second separation membrane 10b is wound. .

Alternatively, the protective tape 40 may be directly attached to a predetermined area of the cathode 20 so that lamination is performed at a portion where the start end of the anode 30 will be located. At this time, the protective tape 40 may be attached after the negative electrode 20 is manufactured before the negative electrode 20 is wound.

In addition, the positive electrode 30 may be injected while the protective tape 40 is attached to cover both surfaces of the starting end of the positive electrode 30. At this time, the attachment point of the protective tape 40 may be attached when the anode 30 is manufactured or immediately before the anode 30 is input, and the attachment length of the protective tape 40 according to the characteristics and specifications of the electrode assembly , The attachment position, etc. can be adjusted.

On the other hand, in the manufacturing method according to the present invention, when a thickness difference occurs during winding, the rotational speed of the winding core 50 is slowed to minimize impact and the injection can be made at an accurate position. That is, when the first separator 10a, the second separator 10b, and the anode 30 are respectively input, the rotational speed of the winding core 50 may be temporarily slowed down, and when the input is completed, it will be returned to its original speed. I can.

In addition, the present invention additionally provides an electrode assembly that can be manufactured through such a manufacturing method. Hereinafter, electrode assemblies according to embodiments of the present invention will be described with reference to FIGS. 4 to 8. For reference, in Figs. 4 to 8, it is shown that a space is provided in the central part where winding of the cathode, the first separator, the second separator, and the anode starts. However, this is intentionally because it becomes difficult to identify when lines are attached to the drawing. It is shown as being spaced apart from each other, and in reality, the cathode, the first separator, the second separator, and the anode are wound in a tightly closed cylindrical shape during rotation.

Embodiment 1

The starting end of the cathode 20 is wound at the center, and the starting ends of each of the first and second separators 10a and 10b are positioned toward the outer side thereof, and the first and second separators 10a and 10b ), the starting end of the anode 30 is shown in FIG. 4, the electrode assembly according to this embodiment includes a cathode 20, a first separator 10a, an anode 30, and a second The separator 10b maintains a stacked structure and has a wound structure.

In this embodiment, the cathode 20 starts winding first and the start end is placed in the center, and after the cathode 20 is rotated a predetermined number of times, along the longitudinal direction (continuous direction) of the cathode 20 The first separation membrane 10a is input at a distance. Accordingly, the first separation layer 10a is wound so that the start end is placed on the outer side of the cathode 20 than the start end. In addition, the second separation layer 10b is introduced at a distance along the length direction (continuous direction) of the first separation layer 10a. Accordingly, the second separation layer 10b is wound so that the start end is located on the outer side of the first separation layer 10a.

In addition, the anode 30 is introduced at a distance along the longitudinal direction (continuous direction) of the second separation layer 10b. At this time, the anode 30 is input so that the start end is positioned between the first separation layer 10a and the second separation layer 10b. Accordingly, the anode 30 has a starting end positioned between the first separation layer 10a and the second separation layer 10b.

Therefore, in the electrode assembly according to the first embodiment, the cathode 20 / first separator 10a / anode 30 / second separator 10b are stacked from one side, and the diameter expands radially in proportion to the number of winding rotations. It has a structure to be

Embodiment 2

5 shows a state in which a protective tape 40 is stacked between the cathode 20 and the first separator 10a according to the second embodiment. As shown, in this embodiment, a protective tape 40 is stacked on the inside of the starting end of the anode 30. That is, at least a portion of the protective tape 40 has a structure in which at least a portion of the anode 30 is stacked between the first separation layer 10a and the cathode 20 at the inside of the starting end of the anode 30.

In this case, the protective tape 40 may be configured to have a thinner thickness toward the end in consideration of the curvature when the portion to be bonded is wound. In this embodiment, the protective tape 40 does not directly contact the anode 30, but the applied stress can be alleviated by thickening the portion of the cathode 20 to be stacked at the beginning of the anode 30. have.

In addition, in this embodiment, the protective tape 40 is preferably formed in a direction in which the adhesive surface is adhered to the cathode 20. That is, it is preferable that the protective tape 40 is attached to a predetermined point of the negative electrode 20 before winding the negative electrode 20.

Third embodiment

6 shows a state in which a protective tape 40 is stacked between the anode 30 and the second separator 10b according to the third embodiment. As shown, in this embodiment, a protective tape 40 is stacked on the outside of the starting end of the anode 30. That is, it has a structure in which at least a portion of the protective tape 40 is stacked between the second separator 10b and the anode 30 so that at least a portion of the protective tape 40 is in contact with the start end of the anode 30.

Likewise in this embodiment, the protective tape 40 may be configured to have a thinner thickness toward the end in consideration of the curvature when the portion to be bonded is wound. In this embodiment, the protective tape 40 directly contacts the anode 30 and distributes the stress that can be started at the beginning of the anode 30 over a larger area, thereby suppressing and dispersing the concentration of stress applied to the cathode. I can make it.

In addition, in this embodiment, the protective tape 40 is preferably formed in a direction in which the second separation layer 10b is adhered. That is, it is preferable that the protective tape 40 is attached to a predetermined point of the second separation layer 10b.

Embodiment 4

7 shows a state in which a protective tape 40 is stacked between the cathode 20 and the second separation layer 10b according to the fourth embodiment. As shown, in this embodiment, a protective tape 40 is stacked on the outside of the starting end of the anode 30. That is, at least a portion of the protective tape 40 has a structure in which at least a portion of the positive electrode 30 is stacked between the second separator 10b and the negative electrode 20.

Likewise in this embodiment, the protective tape 40 may be configured to have a thinner thickness toward the end in consideration of the curvature when the portion to be bonded is wound. Even in this embodiment, the protective tape 40 does not directly contact the anode 30, but the applied stress can be alleviated by thickening the portion of the cathode 20 to be stacked at the beginning of the anode 30. have.

In addition, in this embodiment, the protective tape 40 is preferably formed in a direction in which the adhesive surface is adhered to the cathode 20. That is, it is preferable that the protective tape 40 is attached to a predetermined point of the negative electrode 20 before winding the negative electrode 20.

Embodiment 5

In FIG. 8, according to the fifth embodiment, a protective tape 40 is attached to cover both sides of the starting end of the anode 30. As shown, in this embodiment, a protective tape 40 is attached to cover both the inner side (the side facing the center) and the outer side (the opposite side of the side facing the center) of the starting end of the anode 30. This method has the effect of being able to attach the protective tape 40 more easily than the structure of the previous second to fourth embodiments, and it is not necessary to select the attachment position of the protective tape 40 in advance. Has.

Likewise in this embodiment, the protective tape 40 may be configured to have a thinner thickness toward the end in consideration of the curvature of the portion to be bonded.

In addition, in this embodiment, the protective tape 40 is preferably formed in a direction in which the adhesive surface is adhered to the anode 30. That is, it is preferable that the protective tape 40 is attached to cover the ends of the anode 30 before winding the anode 30.

For reference, in addition to the above embodiments, a configuration in which the protective tape 40 is positioned between the first separator 10a and the anode 30 may also be possible, and the second to fifth embodiments are combined to protect each of the plurality of positions. A configuration in which the tape 40 is disposed may also be possible.

The manufacturing method of the electrode assembly of the present invention having the configuration as described above can provide an electrode assembly in which the cathode 20 is located at the center. Accordingly, since the negative electrode tab can be formed in the center of the electrode assembly, the distance from the positive electrode tab is increased, so that welding can be performed more easily.In the conventional structure, the negative electrode tab is welded to a position inclined from the center of the can to one side. However, in the structure of the present invention, the cathode tab is welded at the center of the can, thereby providing a more stable structure. In addition, the metal pin may be used as a negative electrode tab by inserting a metal pin or the like at the beginning of the negative electrode 20.

In addition, in the present invention, a protective tape 40 is provided so as to be stacked at a position where the starting end of the anode 30 is placed or to surround the starting end of the anode 30 so as to relieve stress applied to the cathode.

The protective tape 40 has one side formed of an adhesive surface so that it can be easily attached, and is made of a material having sufficient elasticity, so that the stress applied to the cathode 20 through elastic deformation of the material can be relieved ( That is, it is possible to increase the performance and safety of the electrode assembly by suppressing the decrease in tensile strength and elongation of the electrode current collector and suppressing the progress of deformation).

In addition, in the present invention, when the first separator 10a and the second separator 10b are inserted and when the anode 30 is inserted, the rotational speed of the winding core 50 is temporarily slowed, so that the injection can be made at an accurate time. It is possible to minimize the impact generated by the starting end of the anode 30.

In the above, although the present invention has been described by limited embodiments and drawings, the present invention is not limited thereto, and the technical idea of the present invention and the following description by those of ordinary skill in the art to which the present invention pertains. Various implementations are possible within the equal range of the claims to be made.

10: separation membrane (10a: first separation membrane, 10b: second separation membrane)
20: cathode
30: anode
40: protective tape
50: Kwon Shim

Claims (13)

In the manufacturing method of an electrode assembly manufactured by winding a cathode, a separator, and an anode from a winding core,
A cathode rotation step (S1) of fixing the starting end of the cathode to the core and rotating the core;
A first separation membrane input step (S2) of injecting a first separation membrane to rotate with the cathode after rotation of the cathode starts;
A second separation membrane input step (S3) of injecting a second separation membrane to rotate with the first separation membrane after the rotation of the first separation membrane starts; And
A method of manufacturing an electrode assembly comprising: an anode injection step (S4) of inserting an anode between the first and second separators so that the anode rotates together after the rotation of the second separator begins.
The method of claim 1,
Prior to the anode injection step (S4), a protective tape is attached to a predetermined region of the first separator or the second separator so as to be stacked at a portion where the start end of the anode will be located. .
The method of claim 2,
The protective tape is a method of manufacturing an electrode assembly, characterized in that the adhesive surface on which the adhesive component is applied is adhered to the first separator or the second separator, and the opposite surface is adhered to abut the anode.
The method of claim 1,
Prior to the positive electrode insertion step (S4), a protective tape is attached, but the protective tape is attached to a predetermined area of the negative electrode so that lamination is performed at a portion where the starting end of the positive electrode will be located. .
The method of claim 1,
A method of manufacturing an electrode assembly, wherein a protective tape is attached to the starting end of the positive electrode before the positive electrode injection step (S4), and the positive electrode is injected while the protective tape is attached.
The method of claim 5,
The method of manufacturing an electrode assembly, wherein the protective tape is attached to cover both sides of the starting end of the positive electrode.
The method according to any one of claims 2 to 6,
The method of manufacturing an electrode assembly, wherein the protective tape is made of a material having higher elasticity than that of the positive electrode.
The method of claim 1,
The method of manufacturing an electrode assembly, characterized in that when the first separator and the second separator are added, the rotational speed of the winding core is temporarily slowed.
The method of claim 1,
When the anode is introduced, the method of manufacturing an electrode assembly, characterized in that the rotational speed of the core is temporarily slowed.
In the electrode assembly wound in a state in which a cathode, a separator, and an anode are stacked,
A cathode wound so that the start end from which the winding starts is placed in the center;
A first separator wound so that a start end from which winding is started is located on an outer side of the cathode than the start end of the cathode;
A second separator wound so that a start end from which winding is started is located on the outer side of the first separator; And
An electrode assembly comprising a; an anode wound so that a start end from which winding is started is placed between the first separator and the second separator.
The method of claim 10,
An electrode assembly, characterized in that a protective tape is inserted into a predetermined region between the cathode and the second separator or between the anode and the first separator, wherein the protective tape is positioned so as to be stacked inside or outside the starting end of the anode.
The method of claim 10,
The positive electrode assembly, characterized in that the protective tape is attached to the start end.
The method of claim 12,
The protective tape is an electrode assembly, characterized in that attached to cover both sides of the starting end of the positive electrode.

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