KR102193741B1 - Electrode assembly comprising unit cells, method of manufacturing the same and lithium secondary battery comprising the same - Google Patents

Abstract

An electrode assembly including unit cells, according to one embodiment of the present invention, comprises: a first unit cell formed in the order of anode, separator, cathode, separator, and anode; and a second unit cell which is provided on and below the first unit cell, and which is formed in the order of anode, separator, and cathode or cathode, separator, and anode, wherein the cathode includes a cathode current collector, a cathode active material coated on both surfaces of the cathode current collector and a non-coated part on which the cathode active material is not coated, and the anode includes an anode current collector, an anode active material coated on one surface and/or the other surface of the anode current collector, and a non-coated part on which the anode active material is not coated, and the separator is provided on the top surface and the bottom surface of the cathode so as to encompass the cathode but not the non-coated part, and a cathode accommodation part in which a part of the separator is accommodated can be formed on the anode active material.

Description

Electrode assembly including a unit cell, a manufacturing method thereof, and a lithium secondary battery including the same TECHNICAL FIELD [ELECTRODE ASSEMBLY COMPRISING UNIT CELLS, METHOD OF MANUFACTURING THE SAME AND LITHIUM SECONDARY BATTERY COMPRISING THE SAME}

The present invention relates to an electrode assembly including a unit cell, a method of manufacturing the same, and a lithium secondary battery including the same, and more particularly, a positive electrode can be pocketed only with a separator without using an insulating polymer film, and the stacking efficiency of the electrode assembly The present invention relates to an electrode assembly including a unit cell capable of improving battery performance and improving battery performance, a method of manufacturing the same, and a lithium secondary battery including the same.

With the recent development of the high-tech electronics industry, the use of portable electronic devices and various types of mobile devices is increasing as electronic equipment can be reduced in size and weight. As the need for a battery having a high energy density increases as a power source for such portable electronic devices and mobile devices, research on lithium secondary batteries is being actively conducted.

In particular, the rapid thinning and miniaturization of electronic devices and mobile devices is rapidly expanding the demand for thin-walled lithium secondary batteries, while the structure and/or manufacturing method of the existing cylindrical or prismatic lithium secondary batteries has made the batteries thinner. There is a limit that it is not excellent in terms of energy density per volume according to Therefore, it is difficult to obtain a sufficient driving time when a thin battery having a thickness of 5 mm or less is generally employed in high-performance portable electronic devices such as mobile phones, camcorders, notebook computers, and mobile devices.

Specifically, the prismatic lithium secondary battery has poor efficiency of the battery compared to the volume due to the electrode body structure having a jelly roll shape, and the battery thickness is due to technical restrictions on reducing the wall thickness of the metal packaging material manufactured by low temperature stretching. Decreases, resulting in lower energy density. On the other hand, in the case of a lithium polymer battery assembled by sealing the stacked electrode assembly with an aluminum laminate packaging material, the waste of space generated by the jelly roll can be reduced, but an excessive amount of a polymer binder is used to increase the adhesion between the electrodes. -Since the adhesive layer must be applied to the electrolyte interface, there is a problem that the energy density and thus the battery performance are deteriorated.

In addition, due to the mechanical fragility of the aluminum laminate packaging material itself and the lack of adhesive strength of the adhesive surface made of the polymer inner skin layer and the metal tab, there are also problems in that the durability and safety of the battery are weak.

In order to solve this problem, the applicant developed and implemented a technology for manufacturing a lithium secondary battery by stacking the pocketing electrode body (anode) disclosed in Korean Patent No. 10-1168650 or Korean Patent No. 10-1168651. Is coming.

However, as shown in Fig. 3 of Korean Patent No. 10-1168650 or Korean Patent No. 10-1168651, in order to make a conventional pocketing electrode body (anode), the insulating polymer film has a shape similar to that of a positive electrode plate. It must be made or punched out by punching (perforating) the space. At this time, the insulating polymer film corresponding to the storage space, that is, the punched insulating polymer film cannot be reused and is discarded as it is, so there is a problem of wasting the insulating polymer film. In addition, there is a problem in that productivity is low because it is necessary to perform repeated punching processes in order to manufacture the pocketing electrode body (anode).

In order to solve this problem, a positive electrode plate thinner than the thickness of the insulating polymer film may be used.If a positive electrode plate thinner than the insulating polymer film is used, it is disadvantageous in terms of the energy density of the battery, and battery failure occurs when the electrode body is unstable. There is a problem that it is likely.

The present applicant has proposed the present invention in order to solve the above problems.

Korean Patent Registration No. 10-1168650 (Registration Notice 2012.07.25.) Korean Patent Registration No. 10-1168651 (Registration Notice 2012.07.26.)

The present invention has been proposed to solve the above problems, and since it forms a pocketing electrode body (anode) without using an insulating polymer film, an electrode assembly including a unit cell capable of reducing manufacturing cost, and manufacturing the same It provides a method and a lithium secondary battery including the same.

The present invention provides an electrode assembly including a unit cell capable of improving productivity because there is no need to perforate or punch an insulating polymer film, a method for manufacturing the same, and a lithium secondary battery including the same.

The present invention is an electrode assembly including a unit cell capable of increasing the contact area between the positive electrode, the separator and the negative electrode and improving the performance of the battery by simultaneously pressing the positive electrode and the negative electrode in the state of stacking the positive electrode and the negative electrode, and manufacturing the same. It provides a method and a lithium secondary battery including the same.

The present invention is an electrode assembly including a unit cell capable of reducing the time required for stacking an electrode body, a method of manufacturing the same, and lithium containing the same, because the electrode assembly is formed by stacking a pre-made unit cell by stacking a positive electrode and a negative electrode. Provides secondary batteries.

An electrode assembly including a unit cell according to an embodiment of the present invention for achieving the above-described problems includes: a first unit cell formed in the order of a cathode/separator/anode/separator/cathode; And a second unit cell provided above and below the first unit cell and formed in the order of a negative electrode/separator/anode or a positive electrode/separator/cathode, wherein the positive electrode includes a positive electrode current collector and a positive electrode current collector. A positive electrode active material coated on both sides and a non-coated portion to which the positive electrode active material is not applied, and the negative electrode includes a negative electrode current collector, a negative electrode active material applied to at least one of both surfaces of the negative electrode current collector, and a non-coated part to which the negative electrode active material is not applied. The separator may be provided on an upper surface and a lower surface of the anode so as to surround the anode except for the uncoated part, and an anode receiving portion for accommodating a part of the separator may be formed in the anode active material.

The first unit cell includes: a pocketing anode including the anode surrounded by the separator; And the negative electrode provided on the upper and lower surfaces of the pocketing positive electrode, wherein the negative electrode includes the negative electrode active material coated on both surfaces of the negative electrode current collector, and one surface of the negative electrode current collector facing the pocketing positive electrode On the surface of the negative electrode active material applied to the negative electrode active material, the positive electrode receiving portion may be formed in a recess or intaglio.

The second unit cell includes: a pocketing anode including the anode surrounded by the separator; And the negative electrode provided on either an upper surface or a lower surface of the pocketing positive electrode, wherein the negative electrode includes the negative electrode active material applied to one surface of the negative electrode current collector, and the positive electrode receiving part is on the surface of the negative electrode active material. It may be formed in a depression or intaglio.

A third unit cell provided between any one of the second unit cells and the first unit cell; And another first unit cell provided between the other one of the second unit cells and the third unit cell, wherein the third unit cell includes the negative electrode active material coated on both surfaces of the negative electrode current collector. The cathode; And a pocketing positive electrode provided on the upper and lower surfaces of the negative electrode and including the positive electrode surrounded by the separator, wherein the positive electrode receiving portion is formed indented on the surface of the negative electrode active material facing the pocketing positive electrode. It can be formed by engraving.

The negative electrode active material in which the positive electrode receiving part is formed may be provided so that the entire surface of the negative electrode active material is in contact with the separator, or the positive electrode receiving part may be formed to be smaller than the total area of the negative electrode active material.

The second unit cell, the first unit cell, the third unit cell, the first unit cell, and the second unit cell may be stacked in order.

The area or size of the anode receiving portion may be larger than the area or size of the anode.

The first unit cell may be a C-type bi-cell, the second unit cell may be a full cell, and the third unit cell may be an A-type bi-cell.

A contact area between the first unit cell and the second unit cell, and a contact area between the first unit cell and the third unit cell may be smaller than the total area of the cathode or may be formed equal to the area of the anode receiving portion. .

In addition, the present invention is the electrode assembly described above; And it is possible to provide a lithium secondary battery including a case for encapsulating an electrolyte solution together with the electrode assembly.

On the other hand, according to another field of the invention, the present invention provides a method for manufacturing the electrode assembly, providing the separation membrane; Providing the anode on the separator; Providing another separator on the anode; Pressing the separator and the anode; And punching or cutting the separator and the positive electrode; thereby forming the pocketing positive electrode, and providing the negative electrode coated with the negative electrode active material on both surfaces of the negative electrode current collector on the upper and lower surfaces of the pocketing positive electrode, It is possible to provide a method for manufacturing an electrode assembly including a unit cell, characterized in that the first unit cell is obtained by punching or cutting after pressing.

In addition, the present invention in the manufacturing method of the electrode assembly, the step of providing the separation membrane; Providing the anode on the separator; Providing another separator on the anode; Pressing the separator and the anode; And punching or cutting the separator and the positive electrode; thereby forming the pocketing positive electrode, providing the pocketing positive electrode on the upper surface of the negative electrode active material applied only to one surface of the negative electrode current collector, pressing, and then punching or It is possible to provide a method for manufacturing an electrode assembly including a unit cell, characterized in that the second unit cell is obtained by cutting.

In addition, the present invention in the manufacturing method of the electrode assembly, the step of providing the separation membrane; Providing the anode on the separator; Providing another separator on the anode; Pressing the separator and the anode; And punching or cutting the separator and the positive electrode; thereby forming the pocketing positive electrode, and providing the pocketing positive electrode on upper and lower surfaces of the negative electrode coated with the negative electrode active material on both surfaces of the negative electrode current collector, It is possible to provide a method of manufacturing an electrode assembly including a unit cell, characterized in that punching or cutting after pressing to obtain the third unit cell.

The electrode assembly including the unit cell according to the present invention, the method for manufacturing the same, and the lithium secondary battery including the same form a pocketing electrode body (anode) without using an insulating polymer film, so that manufacturing cost can be reduced.

The electrode assembly including the unit cell according to the present invention, the method for manufacturing the same, and the lithium secondary battery including the same can improve productivity because there is no need to perforate or punch an insulating polymer film.

The electrode assembly including the unit cell according to the present invention, the method of manufacturing the same, and the lithium secondary battery including the same, since the positive electrode and the negative electrode are simultaneously pressed while the positive electrode and the negative electrode are stacked, the contact area between the positive electrode, the separator and the negative electrode And improve battery performance.

The electrode assembly including the unit cell according to the present invention, the method of manufacturing the same, and the lithium secondary battery including the same are used to form an electrode assembly by stacking pre-made unit cells by stacking a positive electrode and a negative electrode, so the time required to stack the electrode body Can be reduced.

1 is a longitudinal cross-sectional view of an electrode assembly including a unit cell according to an embodiment of the present invention.
2 is an exploded perspective view of the electrode assembly according to FIG. 1.
3 is a cross-sectional view showing the structure and manufacturing process of the pocketing anode included in the electrode assembly according to FIG. 1.
4 is a perspective view showing a pocketing anode included in the electrode assembly according to FIG. 1.
5 is a cross-sectional view showing a structure and manufacturing process of a first unit cell included in the electrode assembly according to FIG. 1.
6 is a perspective view showing a first unit cell included in the electrode assembly according to FIG. 1.
7 is a cross-sectional view showing a structure and manufacturing process of a second unit cell included in the electrode assembly according to FIG. 1.
8 is a perspective view illustrating a second unit cell included in the electrode assembly according to FIG. 1.
9 is a cross-sectional view showing the structure and manufacturing process of a third unit cell included in the electrode assembly according to FIG. 1.
10 is a perspective view showing a third unit cell included in the electrode assembly according to FIG. 1.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited or limited by the embodiments. The same reference numerals in each drawing indicate the same members.

1 is a longitudinal sectional view of an electrode assembly including a unit cell according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the electrode assembly according to FIG. 1, and FIG. 3 is a pocketing anode included in the electrode assembly according to FIG. A cross-sectional view showing the structure and manufacturing process of, FIG. 4 is a perspective view showing a pocketing anode included in the electrode assembly according to FIG. 1, and FIG. 5 is a structure and manufacturing process of a first unit cell included in the electrode assembly according to FIG. 1. A cross-sectional view, FIG. 6 is a perspective view showing a first unit cell included in the electrode assembly according to FIG. 1, FIG. 7 is a cross-sectional view showing the structure and manufacturing process of the second unit cell included in the electrode assembly according to FIG. 1, and FIG. Is a perspective view showing a second unit cell included in the electrode assembly according to FIG. 1, FIG. 9 is a cross-sectional view showing the structure and manufacturing process of the third unit cell included in the electrode assembly according to FIG. 1, and FIG. It is a perspective view showing the third unit cell included in the electrode assembly.

An electrode assembly including a unit cell according to an embodiment of the present invention described below constitutes a lithium secondary battery, and comprises a separator, a positive electrode current collector and a positive electrode active material, a negative electrode current collector, and The negative electrode active material, electrolyte, etc. are the same as those used in the electrode assembly and lithium secondary battery disclosed in Korean Patent No. 10-1168650 or Korean Patent No. 10-1168651, and thus detailed descriptions thereof will be omitted.

The electrode assembly 100 according to an embodiment of the present invention described below is an electrode assembly including a unit cell. That is, the electrode assembly 100 having a structure in which a plurality of electrode bodies are stacked does not repeatedly stack an anode/separator/cathode one by one, but a plurality of pre-made unit cells by stacking an anode/separator/cathode. It is formed by stacking.

Hereinafter, an electrode assembly 100 including a unit cell according to an embodiment of the present invention will be described in detail with reference to the drawings.

1 is a longitudinal cross-sectional view of an electrode assembly 100 including a unit cell according to an embodiment of the present invention.

Referring to FIG. 1, an electrode assembly 100 including a unit cell according to an embodiment of the present invention includes a cathode 121 / a separator 101 / an anode 111 / a separator 102 / a cathode 121 It is provided on the upper and lower portions of the first unit cell UC1 and the first unit cell UC1 formed in the order of the cathode 161 / the separator 101 / the anode 111 or the anode 111 / the separator 101 It may include a second unit cell (UC2) formed in the order of the /cathode 161.

The electrode assembly 100 according to an embodiment of the present invention is not obtained by alternately stacking a plurality of anodes and cathodes, but is obtained by stacking a plurality of preformed unit cells UC1 and UC2 by stacking an anode and a cathode. Therefore, the electrode assembly 100 according to an embodiment of the present invention can increase the stacking speed. For example, in order to obtain the electrode assembly 100 shown in FIG. 1 by repeatedly stacking an anode and a cathode one by one, 7 cathodes and 6 anodes must be alternately stacked. On the other hand, the electrode assembly 100 according to an embodiment of the present invention can be obtained by stacking five unit cells UC1, 2, and 3.

In the electrode assembly 100 according to an embodiment of the present invention shown in FIG. 1, five unit cells are stacked, but even if at least three unit cells are stacked, an electrode assembly 100 capable of functioning a battery is obtained. I can. Therefore, the electrode assembly 100 according to an embodiment of the present invention includes a second unit cell UC2 positioned at the bottom, a first unit cell UC1 stacked thereon, and a first unit cell UC1. It may be configured to include another second unit cell (UC2) stacked on the top. Here, it is preferable that the second unit cells UC2 positioned above and below the first unit cell UC1 have a structure that is symmetrical to each other with respect to the first unit cell UC1.

Here, the anode 111 constituting the first unit cell UC1 and the anode 111 constituting the second unit cell UC2 may have the same shape or structure. The positive electrode 111 included in the first unit cell UC1 and the second unit cell UC2 includes a positive electrode current collector 112, a positive electrode active material 113 applied to both surfaces of the positive electrode current collector 112, and a positive electrode active material ( 113) may include an uncoated portion 119 (refer to FIG. 2).

On the other hand, the cathode 121 constituting the first unit cell UC1 and the cathode 161 constituting the second unit cell UC2 have different shapes. The negative electrodes 121 and 161 constituting the first unit cell UC1 or the second unit cell UC2 include negative electrode active materials 123 and 163 applied to at least one of both surfaces of the negative electrode current collectors 122 and 162 and the negative electrode current collectors 122 and 162, and A non-coated portion 129 (see FIG. 2) to which the negative electrode active materials 123 and 163 are not applied may be included. The negative electrode 121 constituting the first unit cell UC1 is coated with the negative electrode active material 123 on both sides of the negative electrode current collector 122, while the negative electrode 161 constituting the second unit cell UC2 The negative electrode active material 163 is applied only to one surface of the negative electrode current collector 162.

Here, the separator 101 provided on the upper and lower surfaces of the anode 111 constituting the first and second unit cells UC1 and UC2 is an anode to surround the anode 111 except for the uncoated portion 119. 111) may be provided on the upper and lower surfaces. In addition, the anode receiving portion 124 in which a portion of the separator 101 surrounding the anode 111 is accommodated in the anode active materials 123 and 163 of the cathodes 121 and 161 constituting the first and second unit cells UC1 and UC2. Can be formed.

Hereinafter, the first unit cell UC1 will be described with reference to FIGS. 1 to 6. Referring to FIG. 1, a first unit cell UC1 has a structure in which a cathode 121, a separator 101, an anode 111, a separator 101, and a cathode 121 are sequentially stacked up and down. The negative electrode 121 positioned above and below may include a negative electrode current collector 122 and a negative electrode active material 123 coated on both surfaces of the negative electrode current collector 122. The positive electrode 111 positioned between the two negative electrodes 121 may include a positive electrode current collector 112 and a positive electrode active material 123 coated on both surfaces of the positive electrode current collector 122.

In this case, unlike the cathode 121, the anode 111 has a shape surrounded by two separators 101 provided on the upper and lower surfaces of the anode 111. Accordingly, the anode 111 constituting the first unit cell UC1 is provided as a pocketing anode 110 surrounded by the separator 101 except for the uncoated portion 119. As such, the first unit cell UC1 includes a pocketing anode 110 including an anode 111 surrounded by the separator 101 and a cathode 121 provided on the upper and lower surfaces of the pocketing anode 110. ) Can be included.

The negative electrode 121 of the first unit cell UC1 is applied on one surface of the negative electrode current collector 122 facing the pocketing positive electrode 110 from among the negative electrode active materials 123 applied on both sides of the negative electrode current collector 122 On the surface of the negative electrode active material 123, an anode receiving portion 124 (refer to FIG. 5) may be recessed or formed in an intaglio.

3 shows the structure or manufacturing process (method) of the pocketing anode 110. First, as shown in (a) of FIG. 3, a plurality of anodes 111 may be supplied at regular intervals on a long strip-shaped separator 101 supplied in a roll-to-roll manner. Double-sided anodes 111 may be placed on the upper surface of the separation membrane 101 supplied from left to right or supplied from right to left in a roll-to-roll manner and supplied together with the separation membrane 101. The double-sided positive electrode 111 may also be manufactured by applying the positive electrode active material 113 to both surfaces of the long strip-shaped positive electrode current collector 112 supplied in a roll-to-roll manner, followed by pressing and punching.

In the next step, another separator 101 may be supplied in a roll-to-roll manner to cover the upper surface of the anode 111, as shown in FIG. 3B. In the step shown in (b) of FIG. 3, the separator 101 covering the anode 111 is placed on the anode 111.

In the next step, as shown in (c) of FIG. 3, in a state in which the anode 111 is provided between the two separators 101, the separator 101 is pressed to surround the anode 111 by pressing the separator ( 101) They are bonded together. In the process of pressing, the separator 101 may be heated so that the separator 101 may be bonded to each other along the edge of the anode 111. Alternatively, an adhesive component may be applied to the surface of the separator 101 that adheres to each other along the edge of the anode 111. After the pressing step, as shown in (c) of FIG. 3, the separation membranes 101 are adhered to each other at a portion where the anode 111 is not located. The separation membrane 101 has a height difference between a portion where the anode 111 is positioned and a portion where the anode 111 is not positioned. Finally, the pocketing anode 110 is obtained by cutting or punching the portions (refer to the dotted line in FIG. 3(c)) to which the separators 101 are adhered.

Referring to FIG. 4, the pocketing anode 110 has a shape in which the entire anode 111 except for the uncoated portion 119 is surrounded by the separator 101, and a portion of the separator 101 where the anode 111 is located. Has a shape protruding up and down.

Hereinafter, a process of manufacturing the first unit cell UC1 by using the pocketing anode 110 manufactured through the process shown in FIG. 3 will be described. First, a double-sided negative electrode 121 is supplied in a roll-to-roll manner as shown in FIG. 5A. The double-sided negative electrode 121 may be manufactured by applying the negative electrode active material 123 to both surfaces of the negative electrode current collector 122 in the shape of a long strip that is supplied in a roll-to-roll manner, followed by pressing and punching. Next, a positive electrode strip including a plurality of pocketing positive electrodes 110 on the upper surface of the double-sided negative electrode 121 supplied from left to right or supplied from right to left in a roll-to-roll method, that is, the surface of the negative electrode active material 123 By supplying the positive electrode together with the double-sided negative electrode 121 is supplied. Then, the other double-sided cathode 121 may be supplied in a roll-to-roll manner to cover the upper surface of the pocketing anode 110. As shown in (a) of FIG. 5, the double-sided cathode 121 covering the pocketing anode 110 is placed on the pocketing anode 110.

In the next step, as shown in (b) of FIG. 5, in a state in which the pocketing anode 110 is provided between the upper and lower double-sided cathodes 121, the upper and lower double-sided cathodes 121 are pressed to form the double-sided cathode 121 and The pocketing anode 110 is adhered or adhered to each other. Here, in the case of the double-sided negative electrode 121 positioned above and below the pocketing positive electrode 110, it is preferable that the negative electrode active material 123 applied to both sides of the negative electrode current collector 122 is not subjected to a pressing (pressing) process. . In general, after applying the negative electrode active material to the negative electrode current collector, a process of pressing (pressing) the negative electrode active material to the negative electrode current collector is performed.

By the way, in the case of the present invention, after placing the pocketing anode 110 between the double-sided cathode 121 in a state in which the anode active material 123 is not pressed, the double-sided cathode 121 is pressed. The negative electrode active material 123 may also be pressurized and pressed onto the negative electrode current collector 122. In addition, a portion of the positive electrode 111 of the pocketing positive electrode 110, that is, a protruding part, is pushed from the surface of the negative electrode active material 123 by a pressing process, or the portion where the separator 101 of the pocketing positive electrode 110 is adhered to each other, that is, , The negative active material 123 may fill the concave portion.

Figure 5 (a) shows a state before pressurization.Before pressurization, the surface of the negative electrode active material 123 in contact with the pocketing positive electrode 110 is all flat, and the portion where the separator 101 is adhered to each other and the negative electrode active material There is an empty space between (123). 5B shows a state after pressurization. After pressurization, the surface state of the negative electrode active material 123 in contact with the pocketing positive electrode 110 changes, and the portion where the separator 101 is adhered to each other is a negative electrode active material. (123) will be filled. Therefore, after pressing, the anode receiving portion 124 accommodating the protruding portion of the pocketing anode 110 is formed on the surface of the anode active material 123 facing the pocketing anode 110 or is formed in an intaglio. I can. As the anode receiving portion 124 is formed in a depression or intaglio on the surface of the anode active material 123, the double-sided cathode 121 and the pocketing anode 110 come into close contact with each other, as a result of which the anode 111 and the separator 101 And, since the contact area of the negative electrode 121 is increased, the performance of the battery may be improved.

As shown in (b) of FIG. 5, the double-sided cathode 121 / pocketing anode 110 / double-sided cathode 121 are in close contact with each other by a pressing process. In this state, the first unit cell UC1 as shown in (c) of FIG. 5 can be obtained by cutting or punching the portions (refer to the dotted line in FIG. 5(b)) to which the separation membranes 101 are adhered to each other.

Referring to FIG. 6, the upper and lower surfaces of the first unit cell UC1 are formed of an anode active material 123 and are preferably formed in a plane having the same size or area as the anode current collector 122.

A method of manufacturing the first unit cell UC1 constituting the electrode assembly 100 according to an embodiment of the present invention will be described with reference to FIGS. 3 and 5. In the method of manufacturing the electrode assembly 100 according to an embodiment of the present invention, the step of providing the separator 101 (Fig. 3(a)), the step of providing the anode 111 on the separator 101 (Fig. 3) (a)), providing another separator 101 on the anode 111 (Fig. 3(b)), pressing the separator 101 and the anode 111 (Fig. 3(c)), and the separator ( 101) and the positive electrode 111 by punching or cutting (FIG. 3(c)) to form a pocketing positive electrode 110, and the negative electrode active material 123 coated on both sides of the negative electrode current collector 122 The first unit cell UC1 can be obtained by providing 121 on the upper and lower surfaces of the pocketing anode 110 (Fig. 5(a)) and punching or cutting after pressing (Fig. 5(b)) ( Fig. 5(c)).

Hereinafter, a process of manufacturing the second unit cell UC2 using the pocketing anode 110 manufactured through the process shown in FIG. 3 will be described. First, as shown in Fig. 7 (a), the end face negative electrode 161 is supplied in a roll-to-roll method. The single-sided negative electrode 161 may be manufactured by applying the negative electrode active material 163 to only one surface of the negative electrode current collector 162 in a long strip shape supplied in a roll-to-roll method, followed by pressing and punching. Next, a positive electrode strip including a plurality of pocketing positive electrodes 110 on the top surface of the single-sided negative electrode 161 supplied from left to right or from right to left in a roll-to-roll method, that is, on the surface of the negative electrode active material 163 By supplying, the anode is supplied together with the cross-section cathode 161. As shown in (a) of FIG. 7, the pocketing anode 110 is placed on the cross-sectional cathode 161.

In the next step, as shown in (b) of FIG. 7, by pressing the single-sided cathode 161 and the pocketing anode 110, the single-sided cathode 161 and the pocketing anode 110 are bonded or adhered to each other. Here, in the case of the single-sided negative electrode 161 located under the pocketing positive electrode 110, it is preferable that the negative electrode active material 163 applied to one surface of the negative electrode current collector 162 is not subjected to a pressing (pressing) process. . In general, after applying the negative electrode active material to the negative electrode current collector, a process of pressing (pressing) the negative electrode active material to the negative electrode current collector is performed.

However, in the case of the present invention, after placing the pocketing anode 110 on the single-sided anode 161 in a state in which the anode active material 163 is not pressed, the single-sided cathode 161 is pressed. The active material 163 may also be pressurized and pressed onto the negative electrode current collector 162. In addition, a portion of the positive electrode 111 of the pocketing positive electrode 110, that is, a protruding part, is pushed from the surface of the negative electrode active material 163 by a pressing process, or the negative electrode active material 163 is applied to the separator 101 of the pocketing positive electrode 110. ) It may be in the form of filling the adhesive part, that is, the concave part.

Figure 7 (a) shows a state before pressurization.Before pressurization, the surface of the negative electrode active material 163 in contact with the pocketing positive electrode 110 is all flat, and the portion where the separator 101 is adhered to each other and the negative electrode active material There is an empty space between (163). 7(b) shows a state after pressurization. After pressurization, the surface state of the negative electrode active material 163 in contact with the pocketing positive electrode 110 changes, and the portion of the separation membrane 101 adhered to each other is a negative electrode active material. 163 will be filled. Therefore, after pressing, an anode receiving portion 164 (refer to FIG. 7) for receiving the protruding portion of the pocketing anode 110 is formed on the surface of the anode active material 163 facing the pocketing anode 110 or It is formed by engraving. As the anode receiving portion 164 is formed in a depression or intaglio on the surface of the anode active material 163, the cross-section cathode 161 and the pocketing anode 110 come into close contact with each other, as a result of which the anode 111 and the separator 101 And, since the contact area of the negative electrode 161 is increased, the performance of the battery may be improved.

As shown in (b) of FIG. 7, the pocketing anode 110 / the cross-sectional cathode 161 are in close contact with each other by a pressing process. In this state, the second unit cell UC2 as shown in (c) of FIG. 7 can be obtained by cutting or punching the portions (refer to the dotted line in FIG. 7(b)) to which the separation membranes 101 are adhered to each other.

The second unit cell UC2 constituting the electrode assembly 100 according to an embodiment of the present invention includes a pocketing anode 110 and a pocketing anode including an anode 111 surrounded by the separator 101 It includes a single-sided negative electrode 161 provided on either the upper or lower surface of (110), and the single-sided negative electrode 161 includes a negative electrode active material 163 applied to one surface of the negative electrode current collector 162, and a negative electrode active material On the surface of the 163, the anode receiving portion 164 may be recessed or formed in an intaglio.

Referring to FIG. 8, the upper surface of the second unit cell UC2 is formed of the separator 101 of the pocketing anode 110, but there is a step such as the protruding portion, and the lower surface of the second unit cell UC2 is It is formed of the negative active material 163 and may be formed in a plane having the same size or area as the negative electrode current collector 162.

A method of manufacturing the second unit cell UC2 constituting the electrode assembly 100 according to an embodiment of the present invention will be described with reference to FIGS. 3 and 7. In the method of manufacturing the electrode assembly 100 according to an embodiment of the present invention, the step of providing the separator 101 (Fig. 3(a)), the step of providing the anode 111 on the separator 101 (Fig. 3) (a)), providing another separator 101 on the anode 111 (Fig. 3(b)), pressing the separator 101 and the anode 111 (Fig. 3(c)), and the separator ( 101) and the positive electrode 111 by punching or cutting (FIG. 3(c)) to form the pocketing positive electrode 110, and the upper surface of the negative electrode active material 163 applied only to one surface of the negative electrode current collector 162 It is possible to obtain a second unit cell UC2 by providing a pocketing anode 110 (Fig. 7(a)) and punching or cutting after pressing (Fig. 7(b)) (Fig. 7(c)).

Meanwhile, the electrode assembly 100 according to an embodiment of the present invention may further include a third unit cell UC3 in addition to the first and second unit cells UC1 and UC2. As shown in FIGS. 1 and 2, the electrode assembly 100 according to an embodiment of the present invention includes a third electrode assembly provided between any one of the second unit cells UC2 and the first unit cell UC1. It may include another first unit cell UC1 provided between the third unit cell UC3 and the other one of the unit cell UC3 and the second unit cell UC2.

The electrode assembly 100 according to an embodiment of the present invention includes a second unit cell UC2, a first unit cell UC1, a third unit cell UC3, a first unit cell UC1 and It may include a second unit cell (UC2). That is, the electrode assembly 100 can be obtained by stacking five unit cells.

In the electrode assembly 100 according to an embodiment of the present invention, a first unit cell UC1 and a second unit cell UC2 are positioned above and below the third unit cell UC3, respectively, and a third unit cell ( It is symmetrical based on UC3). In addition, a second unit cell (UC2) is located at the lowermost and uppermost ends of the electrode assembly 100, and the lowermost and uppermost surfaces of the electrode assembly 100 are the cathode collection of the cathode 161 of the cross-section of the second unit cell UC2. The whole 162 is located.

Hereinafter, the third unit cell UC3 will be described with reference to FIGS. 1, 9 and 10. Referring to the drawings, the third unit cell UC3 has a structure in which a pocketing anode 110, a double-sided cathode 141, and a pocketing anode 110 are sequentially stacked up and down. Here, the pocketing anodes 110 positioned above and below are the same as those constituting the first unit cell UC1, and the single-sided cathode 141 positioned in the middle is the double-sided cathode 121 constituting the first unit cell UC1. ) Is the same.

The third unit cell UC3 is provided on the upper and lower surfaces of the double-sided negative electrode 141 and the double-sided negative electrode 141 including the negative electrode active material 143 coated on both surfaces of the negative electrode current collector 142, and a separator ( It may include a pocketing anode 110 including an anode 111 surrounded by 101). Here, the anode receiving portion 144 in which the protruding portion of the pocketing anode 110 is accommodated may be formed in a recess or intaglio on the surface of the anode active material 143 facing the pocketing anode 110. The pocketing anode 110 may be manufactured through the process shown in FIG. 3.

Hereinafter, a process of manufacturing the third unit cell UC3 using the pocketing anode 110 manufactured through the process shown in FIG. 3 will be described. First, as shown in Fig. 9 (a), the pocketing anode 110 is supplied in a roll-to-roll manner. The pocketing anode 110 may be supplied in a long strip shape by a roll-to-roll method. Next, a long strip-shaped double-sided negative electrode 141 is supplied to the upper surface of the pocketing positive electrode 110 supplied from left to right or from right to left in a roll-to-roll method, and the negative electrode together with the pocketing positive electrode 110 Will be supplied. Thereafter, the band of the other pocketing anode 110 may be supplied in a roll-to-roll manner to cover the upper surface of the double-sided cathode 141. As shown in (a) of FIG. 9, the pocketing anode 110 covering the double-sided cathode 141 is placed on the double-sided cathode 141.

In the next step, the double-sided cathode 141 is pressed by pressing the upper and lower pocketing anodes 110 while the double-sided cathode 141 is provided between the upper and lower pocketing anodes 110 as shown in FIG. 9B. And the pocketing anode 110 is adhered or closely attached. Here, in the case of the double-sided negative electrode 141 positioned between the pocketing positive electrode 110, it is preferable that the negative electrode active material 143 applied to both sides of the negative electrode current collector 142 is not subjected to a pressing (pressing) process. . In general, after applying the negative electrode active material to the negative electrode current collector, a process of pressing (pressing) the negative electrode active material to the negative electrode current collector is performed.

By the way, in the case of the present invention, after placing the double-sided negative electrode 141 between the pocketing positive electrode 110 in a state in which the negative electrode active material 143 is not pressed, the pocketing positive electrode 110 is pressed. As a result, the negative electrode active material 143 may also be pressurized and pressed onto the negative electrode current collector 142. In addition, a portion of the positive electrode 111 of the pocketing positive electrode 110, that is, a protruding part, is pushed from the surface of the negative electrode active material 143 by a pressing process, or the part where the separator 101 of the pocketing positive electrode 110 is adhered to each other, that is, , The negative active material 143 may fill the concave portion.

Figure 9 (a) shows a state before pressurization. Before pressurization, the surface of the negative electrode active material 143 in contact with the pocketing positive electrode 110 is all flat, and the portion where the separator 101 is adhered to each other and the negative electrode active material There is an empty space between (143). 9(b) shows a state after pressurization. After pressurization, the surface state of the negative electrode active material 143 in contact with the pocketing positive electrode 110 changes, and the portion of the separator 101 adhered to each other is (143) will be filled. Therefore, after pressing, the anode receiving portion 144 receiving the protruding portion of the pocketing anode 110 is formed on the surface of the anode active material 143 facing the pocketing anode 110 to be recessed or formed in an intaglio. I can. As the anode receiving portion 144 is formed in a depression or intaglio on the surface of the anode active material 143, the double-sided cathode 141 and the pocketing anode 110 come into close contact with each other, as a result of which the anode 111 and the separator 101 And, since the contact area of the negative electrode 141 is increased, the performance of the battery may be improved.

As shown in (b) of FIG. 9, the pocketing anode 110 / the double-sided cathode 141 / the pocketing anode 110 are in close contact with each other by a pressing process. In this state, the third unit cell UC3 as shown in (c) of FIG. 9 can be obtained by cutting or punching the portions (refer to the dotted line in FIG. 9(b)) to which the separation membranes 101 are adhered.

Referring to FIG. 10, the upper and lower surfaces of the third unit cell UC3 are formed of the separator 101 of the pocketing anode 110, but may be formed in a form in which a step such as a protruding portion exists.

A method of manufacturing the third unit cell UC3 constituting the electrode assembly 100 according to an embodiment of the present invention will be described with reference to FIGS. 3 and 9. In the method of manufacturing the electrode assembly 100 according to an embodiment of the present invention, the step of providing the separator 101 (Fig. 3(a)), the step of providing the anode 111 on the separator 101 (Fig. 3) (a)), providing another separator 101 on the anode 111 (Fig. 3(b)), pressing the separator 101 and the anode 111 (Fig. 3(c)), and the separator ( 101) and the positive electrode 111 by punching or cutting (FIG. 3(c)) to form the pocketing positive electrode 110, and both sides of the negative electrode current collector 142 coated with the negative electrode active material 143 A third unit cell UC3 can be obtained by providing a pocketing anode 110 on the upper and lower surfaces of the cathode 141 (Fig. 9(a)) and punching or cutting after pressing (Fig. 9(b)). (Fig. 9(c)).

In the first to third unit cells (UC1, UC2, UC3), the anode active materials 123, 163, and 143 in which the anode receiving portions 124, 164, and 144 are formed are provided so that the entire surface is in contact with the separator 101, and the anode receiving portions 124, 164, 144 The area may be formed smaller than the total area of the negative electrode active materials 123, 163, and 143.

In addition, in the first to third unit cells (UC1, UC2, UC3), the area or size of the anode receiving portions 124, 164, 144 formed on the anode active materials 123, 163, 143 of the anodes 121, 161 and 141 is the area or size of the anode 111 It can be formed larger. This is because the thickness of the separator 101 accommodated in the anode receiving portions 124, 164, and 144 must be considered.

Meanwhile, the first unit cell UC1 is a C Type Bicell, the second unit cell UC2 is a Fullcell, and the third unit cell UC3 is an A Type Bicell. Can be formed as

A type bicell is a unit cell of a structure stacked in the order of anode/separator/cathode/separator/anode, and C type bicell is a cathode/separator/anode/separator/cathode. It is a unit cell of a structure stacked in order. In addition, a full cell is a unit cell having a stacked structure of an anode/separator/cathode.

Referring to FIG. 1, the first unit cell UC1 is stacked in the order of a double-sided cathode 121, a pocketing anode 110, and a double-sided cathode 121. More specifically, the first unit cell UC1 Silver cathode 121 / separator 101 / anode 111 / separator 101 / cathode 121 has a structure in the order of stacked. Therefore, it can be said that the first unit cell UC1 having such a stacked structure is formed of a C-type bi-cell in which the cathode is located outside.

The second unit cell UC2 is stacked in the order of the pocketing anode 110 and the cross-section cathode 161. In more detail, the second unit cell UC2 has a structure in which a separator 101 / an anode 111 / a separator 101 / a cathode 161 are stacked in this order. Accordingly, the second unit cell UC2 having such a stacked structure can be said to be formed as a full cell having a stacked structure of an anode/separator/cathode.

The third unit cell UC3 is stacked in the order of the pocketing anode 110, the double-sided cathode 141, and the pocketing anode 110. More specifically, the third unit cell UC3 is the separator 101 / Anode 111 / separator 101 / cathode 121 / separator 101 / anode 111 / separator 101 in the order of stacked structure. Accordingly, it can be said that the third unit cell UC3 having such a stacked structure is formed of an A-type bi-cell with an anode positioned on the outside.

Meanwhile, referring to FIG. 1, an electrode assembly 100 including a unit cell according to an embodiment of the present invention includes a contact area between a first unit cell UC1 and a second unit cell UC2, and a first unit. The contact area between the cell UC1 and the third unit cell UC3 may be smaller than the total area of the cathodes 121, 161, and 141 or may be formed equal to the area of the anode receiving portions 124, 164, and 144.

In the case of the first unit cell UC1 and the second unit cell UC2, the protruding portion of the pocketing anode 110 of the second unit cell UC2 is in contact with the upper or lower surface of the first unit cell UC1. However, the area of the protruding portion of the pocketing anode 110 is smaller than the area of the upper or lower surface of the first unit cell UC1. When the first unit cell UC1 and the second unit cell UC2 are stacked while matching the edges, the protruding portion of the second unit cell UC2 is located inside the upper or lower edge of the first unit cell UC1. As a result, the positive electrode 111 and the negative electrode 121 and 161 are accurately aligned. Contact between the first unit cell UC1 and the third unit cell UC3 is the same.

The pocketing anode 110 described above has a shape surrounding the anode 111 by directly bonding the separators 101 to each other. That is, a pocketing anode is formed only with a separator and an anode without using a polymer insulating film.

On the other hand, the present invention is a lithium secondary battery including an electrode assembly 100 including a unit cell according to the present invention and a case (not shown) for sealingly receiving an electrolyte solution (not shown) together with the electrode assembly 100 Can provide knowledge. When the electrode assembly 100 including the unit cell according to the present invention is sealed and accommodated in a case (not shown) together with an electrolyte, it becomes a lithium secondary battery.

The electrode assembly 100 including the unit cell according to the present invention can be used not only for a general lithium secondary battery, but also for a release cell type lithium secondary battery. Here, the "release cell" refers to a battery whose shape is not determined or has various shapes.

As described above, in the embodiments of the present invention, specific matters such as specific components, etc., and limited embodiments and drawings have been described, but this is only provided to help a more general understanding of the present invention, and the present invention is limited to the above embodiments. It is not, and a person of ordinary skill in the field to which the present invention belongs can make various modifications and variations from this description. Accordingly, the spirit of the present invention is limited to the described embodiments and should not be defined, and all things equivalent or equivalent to the claims as well as the claims to be described later belong to the scope of the inventive concept.

100: electrode assembly including unit cells
101: separator
110: pocketing anode
111: anode
112: positive electrode current collector
113: cathode active material
119,129: no branch
121,141,161: cathode
122,142,162: negative electrode current collector
123,143,163: negative active material
124,144,164: anode receiving part
UC1: 1st unit cell
UC2: 2nd unit cell
UC3: 3rd unit cell

Claims (17)

delete delete delete delete delete delete delete delete delete delete A first unit cell formed in the order of a cathode/separator/anode/separator/cathode; And a second unit cell provided above and below the first unit cell and formed in the order of a negative electrode/separator/anode or a positive electrode/separator/cathode, wherein the positive electrode includes a positive electrode current collector and a positive electrode current collector. A positive electrode active material coated on both sides and a non-coated part to which the positive electrode active material is not applied, and the negative electrode includes a negative electrode current collector, a negative electrode active material applied to at least one of both surfaces of the negative electrode current collector, and a non-coated part to which the negative electrode active material is not applied. Including, the separator is provided on the upper and lower surfaces of the positive electrode to surround the positive electrode excluding the uncoated part, the negative electrode active material is formed with a positive electrode receiving portion accommodating a part of the separator,
The first unit cell includes: a pocketing anode including the anode surrounded by the separator; And the negative electrode provided on the upper and lower surfaces of the pocketing positive electrode, wherein the negative electrode includes the negative electrode active material coated on both surfaces of the negative electrode current collector, and one surface of the negative electrode current collector facing the pocketing positive electrode On the surface of the negative electrode active material applied to the positive electrode receiving portion is formed in a depression or intaglio,
A third unit cell provided between any one of the second unit cells and the first unit cell; And another first unit cell provided between the other one of the second unit cells and the third unit cell, and
The third unit cell may include: the negative electrode including the negative electrode active material coated on both surfaces of the negative electrode current collector; And a pocketing anode provided on the upper and lower surfaces of the negative electrode and including the positive electrode surrounded by the separator.
On the surface of the negative electrode active material facing the pocketing positive electrode, the positive electrode receiving portion is formed in a depression or intaglio, and the negative electrode active material having the positive electrode receiving portion is provided such that the entire surface is in contact with the separator, or the area of the positive electrode receiving portion is And a unit cell formed to be smaller than the total area of the negative electrode active material and formed by stacking the second unit cell, the first unit cell, the third unit cell, the first unit cell, and the second unit cell in this order. In the manufacturing method of the electrode assembly,
Providing the separation membrane;
Providing the anode on the separator;
Providing another separator on the anode;
Pressing the separator and the anode; And
Forming the pocketing anode by punching or cutting the separator and the anode,
A unit cell comprising a unit cell, characterized in that the negative electrode on which the negative electrode active material is coated on both sides of the negative electrode current collector is provided on the upper and lower surfaces of the pocketing positive electrode, pressed, and then punched or cut to obtain the first unit cell. Method of manufacturing an electrode assembly.
A first unit cell formed in the order of a cathode/separator/anode/separator/cathode; And a second unit cell provided above and below the first unit cell and formed in the order of a negative electrode/separator/anode or a positive electrode/separator/cathode, wherein the positive electrode includes a positive electrode current collector and a positive electrode current collector. A positive electrode active material coated on both sides and a non-coated part to which the positive electrode active material is not applied, and the negative electrode includes a negative electrode current collector, a negative electrode active material applied to at least one of both surfaces of the negative electrode current collector, and a non-coated part to which the negative electrode active material is not applied. Including, the separator is provided on the upper and lower surfaces of the positive electrode to surround the positive electrode excluding the uncoated part, the negative electrode active material is formed with a positive electrode receiving portion accommodating a part of the separator,
The first unit cell includes: a pocketing anode including the anode surrounded by the separator; And the negative electrode provided on the upper and lower surfaces of the pocketing positive electrode, wherein the negative electrode includes the negative electrode active material coated on both surfaces of the negative electrode current collector, and one surface of the negative electrode current collector facing the pocketing positive electrode On the surface of the negative electrode active material applied to the positive electrode receiving portion is formed in a depression or intaglio,
A third unit cell provided between any one of the second unit cells and the first unit cell; And another first unit cell provided between the other one of the second unit cells and the third unit cell, and
The third unit cell may include: the negative electrode including the negative electrode active material coated on both surfaces of the negative electrode current collector; And a pocketing anode provided on the upper and lower surfaces of the negative electrode and including the positive electrode surrounded by the separator.
On the surface of the negative electrode active material facing the pocketing positive electrode, the positive electrode receiving portion is formed in a depression or intaglio, and the negative electrode active material having the positive electrode receiving portion is provided such that the entire surface is in contact with the separator, or the area of the positive electrode receiving portion is And a unit cell formed to be smaller than the total area of the negative electrode active material and formed by stacking the second unit cell, the first unit cell, the third unit cell, the first unit cell, and the second unit cell in this order. In the manufacturing method of the electrode assembly,
Providing the separation membrane;
Providing the anode on the separator;
Providing another separator on the anode;
Pressing the separator and the anode; And
Forming the pocketing anode by punching or cutting the separator and the anode,
A method of manufacturing an electrode assembly including a unit cell, characterized in that the pocketing positive electrode is provided on the upper surface of the negative active material applied to only one surface of the negative electrode current collector, pressed, and then punched or cut to obtain the second unit cell .
A first unit cell formed in the order of a cathode/separator/anode/separator/cathode; And a second unit cell provided above and below the first unit cell and formed in the order of a negative electrode/separator/anode or a positive electrode/separator/cathode, wherein the positive electrode includes a positive electrode current collector and a positive electrode current collector. A positive electrode active material coated on both sides and a non-coated part to which the positive electrode active material is not applied, and the negative electrode includes a negative electrode current collector, a negative electrode active material applied to at least one of both surfaces of the negative electrode current collector, and a non-coated part to which the negative electrode active material is not applied. Including, the separator is provided on the upper and lower surfaces of the positive electrode to surround the positive electrode excluding the uncoated part, the negative electrode active material is formed with a positive electrode receiving portion accommodating a part of the separator,
The first unit cell includes: a pocketing anode including the anode surrounded by the separator; And the negative electrode provided on the upper and lower surfaces of the pocketing positive electrode, wherein the negative electrode includes the negative electrode active material coated on both surfaces of the negative electrode current collector, and one surface of the negative electrode current collector facing the pocketing positive electrode On the surface of the negative electrode active material applied to the positive electrode receiving portion is formed in a depression or intaglio,
A third unit cell provided between any one of the second unit cells and the first unit cell; And another first unit cell provided between the other one of the second unit cells and the third unit cell, and
The third unit cell may include: the negative electrode including the negative electrode active material coated on both surfaces of the negative electrode current collector; And a pocketing anode provided on the upper and lower surfaces of the negative electrode and including the positive electrode surrounded by the separator.
On the surface of the negative electrode active material facing the pocketing positive electrode, the positive electrode receiving portion is formed in a depression or intaglio, and the negative electrode active material having the positive electrode receiving portion is provided such that the entire surface is in contact with the separator, or the area of the positive electrode receiving portion is And a unit cell formed to be smaller than the total area of the negative electrode active material and formed by stacking the second unit cell, the first unit cell, the third unit cell, the first unit cell, and the second unit cell in this order. In the manufacturing method of the electrode assembly,
Providing the separation membrane;
Providing the anode on the separator;
Providing another separator on the anode;
Pressing the separator and the anode; And
Forming the pocketing anode by punching or cutting the separator and the anode,
Comprising a unit cell, characterized in that the pocketing positive electrode is provided on the upper and lower surfaces of the negative electrode on which the negative electrode active material is coated on both surfaces of the negative electrode current collector, pressed, and then punched or cut to obtain the third unit cell. Method of manufacturing an electrode assembly.
The method according to any one of claims 11 to 13,
The second unit cell,
A pocketing anode including the anode surrounded by the separator; And
Including the negative electrode provided on either the upper surface or the lower surface of the pocketing positive electrode,
The negative electrode includes the negative electrode active material coated on one surface of the negative electrode current collector,
The method of manufacturing an electrode assembly including a unit cell, characterized in that the positive electrode receiving portion is formed in a depression or intaglio on the surface of the negative electrode active material.
The method according to any one of claims 11 to 13,
The method of manufacturing an electrode assembly including a unit cell, characterized in that the area or size of the anode receiving portion is formed larger than the area or size of the anode.
The method according to any one of claims 11 to 13,
The first unit cell is a C-type bi-cell, the second unit cell is a full cell, and the third unit cell is formed of an A-type bi-cell.
The method according to any one of claims 11 to 13,
The contact area between the first unit cell and the second unit cell, and the contact area between the first unit cell and the third unit cell is smaller than the total area of the cathode or is formed equal to the area of the anode receiving part. Method for producing an electrode assembly comprising a unit cell of.

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