KR102196102B1 - Electrode assembly comprising bicells and lithium secondary battery comprising the same - Google Patents

Abstract

The present invention relates to an electrode assembly comprising a bi-cell, capable of increasing the stacking speed and, more specifically, to an electrode assembly comprising at least one of a first A type bi-cell formed in the order of a positive electrode/separator/negative electrode/separator/positive electrode or a first C type bi-cell formed in the order of a negative electrode/separator/positive electrode/separator/negative electrode, wherein the positive electrode and the negative electrode include an electrode current collector, an electrode active material applied to both surfaces of the electrode current collector, and a non-coated portion to which the electrode active material is not applied. In addition, the positive electrode and the negative electrode may be provided in a space formed by the separator and an insulating member provided between the separators to surround edges of the positive electrode and the negative electrode except for the un-coated portion.

Description

Electrode assembly including bi-cell and lithium secondary battery including same {ELECTRODE ASSEMBLY COMPRISING BICELLS AND LITHIUM SECONDARY BATTERY COMPRISING THE SAME}

The present invention relates to an electrode assembly including a bi-cell and a lithium secondary battery including the same, and more particularly, a bi-cell capable of increasing the stacking speed of the stacked electrode assembly and completely controlling the alignment of the anode and the cathode. It relates to an electrode assembly 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 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.

Here, in the case of manufacturing a lithium secondary battery having a stacked structure using a pocketing positive electrode, the pocketing positive electrode and the negative electrode must be alternately stacked. At this time, it is desirable to have a negative electrode at the bottom and top of the stacked structure, and the bottom and top negative electrodes are made of a negative electrode active material coated on the end face of the negative electrode collector (hereinafter referred to as "single-side negative electrode") and between them. The negative electrode stacked in is a negative electrode active material coated on both sides of the negative electrode current collector (hereinafter, referred to as "double-sided negative electrode"). However, in order to form an electrode assembly by stacking the existing pocketing anode, double-sided cathode, and single-sided cathode, the electrode body must be repeatedly stacked. For example, in order to form an electrode assembly in which the anode and the cathode face each other eight times, a single-sided cathode must be placed at the bottom and top, and four pocketing anodes and three double-sided cathodes must be alternately stacked between them. That is, nine electrode bodies must be stacked. As described above, in the case of the existing electrode assembly, there is a problem that the stacking process is cumbersome and time-consuming because the electrode body must be stacked several times as well as alignment work to match the edges of the stacked electrode body. . This means there is a limit to lowering the productivity of the lithium secondary battery.

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 in order to solve the above problems, and provides an electrode assembly including a bi-cell capable of improving the stacking efficiency of the electrode body or increasing the stacking speed, and a lithium secondary battery including the same.

The present invention provides an electrode assembly including a bi-cell capable of accurately aligning stacked electrode bodies and a lithium secondary battery including the same.

An electrode assembly comprising a bi-cell according to an embodiment of the present invention for achieving the above-described problem is a first type A bi-cell or a cathode/separator/ It includes at least one of a first C-type bi-cell formed in the order of a positive electrode/separator/cathode, and the positive electrode and the negative electrode are an electrode collector, an electrode active material applied to both surfaces of the electrode collector, and the electrode active material are not applied. The anode and the cathode may be provided in a space formed by the separator and an insulating member provided between the separator to surround the edges of the anode and the cathode except for the uncoated part, and the anode and the cathode may be provided.

At least two of the first A-type bicells provided up and down; A second cathode positioned between the first A-type bi-cell; And a third negative electrode positioned above and below the first A-type bi-cell to face the second negative electrode, wherein the second negative electrode includes a negative electrode current collector and a negative electrode active material coated on both surfaces of the negative electrode current collector Including, the third negative electrode may include a negative electrode current collector and a negative electrode active material coated on one surface of the negative electrode current collector facing the first type A bicell.

The second cathode and the third cathode may be formed to have a shape or size coincident with an edge of the first A-type bi-cell.

At least the two first C-type bi-cells provided up and down; A second anode positioned between the first C-type bi-cell; And a third positive electrode positioned above and below the first C-type bicell to face the second positive electrode, wherein the second positive electrode includes a positive electrode current collector and a positive electrode active material coated on both surfaces of the positive electrode current collector Including, the third positive electrode may include a positive electrode current collector and a positive electrode active material applied to one surface of the positive electrode current collector facing the first C-type bi-cell.

The second anode and the third anode may be formed in a shape or size smaller than the edge of the first C-type bi-cell, or may be formed in the same shape or size as the anode included in the first C-type bi-cell.

At least two second cathodes provided up and down; The first A-type bi-cell positioned between the second cathode; A second A-type bi-cell positioned above the second cathode to face the first A-type bi-cell; And a fourth positive electrode positioned under the second negative electrode so as to face the first A-type bicell, wherein the positive electrode positioned at the top of the second A-type bi-cell includes a positive electrode current collector and the first A It may include a positive electrode active material applied to one surface of the positive electrode current collector facing the type bi-cell.

The fourth positive electrode positioned under the second negative electrode so as to face the first A-type bicell includes a positive electrode current collector and a positive electrode active material applied to one surface of the positive electrode current collector facing the first A-type bi-cell. And the positive electrode current collector and the positive electrode in a space formed by the separator disposed on the upper and lower surfaces of the positive electrode current collector and the insulating member disposed between the separator so as to surround an edge of the positive electrode current collector. An active material may be prepared.

The first A-type bi-cell, the second A-type bi-cell, the second cathode, and the fourth anode may be formed in a shape or size with matching edges.

The first type A bicell; A second C-type bi-cell positioned above the first A-type bi-cell; And a second C-type bicell positioned below the first A-type bicell, wherein the cathode positioned at the top of the second C-type bicell positioned above the first A-type bicell is , A negative electrode current collector and a negative electrode active material applied to one surface of the negative electrode current collector facing the first A-type bi-cell, and the lowermost end of the second C-type bi-cell located under the first A-type bi-cell The negative electrode positioned at may include a negative electrode current collector and a negative electrode active material coated on one surface of the negative electrode current collector facing the first A-type bi-cell.

The first A-type bi-cell and the second C-type bi-cell may be formed in a shape or size with matching edges.

The first type C bicell; A second A-type bi-cell positioned above the first C-type bi-cell; And a second A-type bi-cell positioned below the first C-type bi-cell, wherein the anode positioned at the top of the second A-type bi-cell positioned above the first C-type bi-cell is The lowermost end of the second A-type bi-cell, which includes a positive electrode current collector and a positive electrode active material applied to one surface of the positive electrode current collector facing the first C-type bi-cell, and is located under the first C-type bi-cell The positive electrode positioned at may include a positive electrode current collector and a positive electrode active material applied to one surface of the positive electrode current collector facing the first C-type bi-cell.

The first C-type bi-cell and the second A-type bi-cell may be formed in a shape or size in which the edges match.

The insulating member provided to surround the edge of the anode may be formed to have a larger width than the insulating member provided to surround the edge of the cathode.

The negative electrode provided in the space formed by the insulating member and the separator may be formed to have a larger area than the positive electrode provided in the space formed by the insulating member and the separator.

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

The electrode assembly including the bi-cell according to the present invention and the lithium secondary battery including the same can improve the productivity of the electrode assembly because the electrode assembly can be obtained by first forming an A-type bi-cell or a C-type bi-cell and stacking them. have.

In the electrode assembly including the bi-cell according to the present invention and the lithium secondary battery including the same, since the A-type bi-cell or the C-type bi-cell and the anode or the anode are stacked, the stacking speed can be increased.

In the electrode assembly including the bi-cell according to the present invention and the lithium secondary battery including the same, only the edge of the bi-cell and the negative or positive electrode coincide with the edge of the A-type bi-cell or the C-type bi-cell. If so, the alignment of the entire electrode assembly can be ensured.

1 is a longitudinal sectional view of an electrode assembly including a bi-cell according to a first embodiment of the present invention.
2 is a plan view of the electrode assembly according to FIG. 1.
3 is a perspective view illustrating a pocketing anode included in the electrode assembly according to FIG. 1.
4 is a perspective view illustrating a double-sided cathode and an insulating member included in the electrode assembly according to FIG. 1.
5 is a partial exploded perspective view of the electrode assembly according to FIG. 1.
6 is a longitudinal sectional view of an electrode assembly including a bi-cell according to a second embodiment of the present invention.
7 is a perspective view illustrating a pocketing cathode included in the electrode assembly according to FIG. 6.
FIG. 8 is a perspective view showing an anode and an insulating member included in the electrode assembly according to FIG. 6.
9 is a partially exploded perspective view of the electrode assembly according to FIG. 6.
10 is a longitudinal sectional view of an electrode assembly including a bi-cell according to a third embodiment of the present invention.
11 is a longitudinal cross-sectional view of an electrode assembly including a bi-cell according to a fourth embodiment of the present invention.
12 is a longitudinal cross-sectional view of an electrode assembly including a bi-cell according to a fifth embodiment of the present invention.

Hereinafter, exemplary 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 bi-cell according to a first embodiment of the present invention, FIG. 2 is a plan view of the electrode assembly according to FIG. 1, and FIG. 3 is a pocketing anode included in the electrode assembly according to FIG. FIG. 4 is a perspective view showing a double-sided cathode and an insulating member included in the electrode assembly according to FIG. 1, FIG. 5 is a partially exploded perspective view of the electrode assembly according to FIG. 1, and FIG. 6 is a second embodiment of the present invention. A longitudinal sectional view of an electrode assembly including a bicell according to an example, FIG. 7 is a perspective view showing a pocketing cathode included in the electrode assembly according to FIG. 6, and FIG. 8 is a positive electrode and an insulating member included in the electrode assembly according to FIG. 6 FIG. 9 is a partially exploded perspective view of the electrode assembly according to FIG. 6, FIG. 10 is a longitudinal sectional view of an electrode assembly including a bi-cell according to a third embodiment of the present invention, and FIG. 11 is a fourth of the present invention. A longitudinal sectional view of an electrode assembly including a bi-cell according to an embodiment, and FIG. 12 is a longitudinal sectional view of an electrode assembly including a bi-cell according to a fifth embodiment of the present invention.

The electrode assembly including the bicell according to the present invention described below constitutes a lithium secondary battery, and includes a separator, a positive electrode collector and a positive electrode active material, a negative electrode collector and a negative electrode active material, an electrolyte, etc. Is the same as that 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 description thereof will be omitted.

The electrode assembly 100, 200, 300, 400, 500 according to the present invention described below is an electrode assembly including a bi-cell. That is, the electrode assembly (100,200,300,400,500) having a structure in which a plurality of electrode bodies are stacked is an A Type Bicell formed in the order of an anode/separator/cathode/separator/anode or a cathode/separator/anode/ It may include at least one of C Type Bicells formed in the order of a separator/cathode.

Here, a bicell is a type of unit cell, and a unit stack structure of anode/separator/cathode/separator/anode (type A bicell) and cathode/separator/anode/separator/cathode unit Like a stacked structure (C-type bi-cell), it refers to a cell in which the same electrode is located on both sides (topmost and bottommost) of the cell.

The electrode assembly (100, 200, 300, 400, 500) according to the present invention described below is not in a form in which pocketing anodes and cathodes are alternately stacked one by one, but at least one of the above-described A-type bi-cell or C-type bi-cell and anode or cathode are alternately It is characterized by being a stacked form. Accordingly, the electrode assembly according to the present invention is an electrode assembly 100, 200, 300, 400, 500 including a bi-cell. Hereinafter, an electrode assembly including a bi-cell according to the present invention will be described in detail with reference to the drawings.

First, in FIGS. 1 to 5, an electrode assembly 100 according to a first embodiment of the present invention is shown.

1 to 5, an electrode assembly 100 including a bi-cell according to the first embodiment of the present invention includes an anode 111 / a separator 102 / a cathode 121 / a separator 101 / It may include at least one first A-type bi-cell BC1 formed in the order of the anode 111. Referring to FIG. 1, an electrode assembly 100 including a bicell BC1 according to the first embodiment is provided between two first A-type bi-cells BC1 and a first A-type bi-cell BC1. It may include a second cathode 141 of the double-sided cathode positioned, and a third cathode 161 of the single-sided cathode disposed at the top and bottom ends, respectively. That is, the electrode assembly 100 including the bi-cell according to the first embodiment of the present invention, in order from the bottom, is the third cathode 161 of the single-sided cathode, the first A-type bi-cell BC1, and the double-sided cathode. It may be formed by stacking the second cathode 141, the first A-type bi-cell BC1, and the third cathode 161 of a single-sided cathode. In other words, when the five electrode bodies BC1, 141, 161 are stacked, an electrode assembly 100 in which the anode and the cathode face each other eight times can be obtained. In the conventional case, in order to obtain an electrode assembly in which the anode and the cathode face each other eight times, 9 electrode bodies must be stacked. Compared with the prior art, the electrode assembly 100 according to the first embodiment of the present invention reduces the number of stacking. Lamination speed can be increased.

Here, the positive electrode 111 and the negative electrode 121 included in the first A-type bi-cell BC1 are the electrode current collectors 112 and 122, the electrode active materials 113 and 123 applied to both surfaces of the electrode current collectors 112 and 122, and the electrode active material. An insulating member provided between the separation membranes 101 and 102 to surround the edges of the anode and cathode 111 and 121 except for the uncoated portions 119 and 129 (see FIG. 2) and the uncoated portions 113 and 123 are not applied ( The anode 111 and the cathode 121 may be provided in the space formed by the 115 and 125 and the separators 101 and 102.

Referring to FIG. 1, the first A-type bi-cell BC1 is, in order from the bottom, a separator 101, a double-sided anode 111, a separator 102, a double-sided cathode 121, a separator 101, and The anode 111 and the separator 102 are stacked to form one unit cell. Here, each of the double-sided anode 111 and the double-sided cathode 121 is provided between the separators 101 and 102 provided up and down, and the separators 101 and 102, but is provided along the edge of the anode 111 or the cathode 121 It is surrounded by members 115 and 125. That is, the anode 111 or the cathode 121 may be provided in the form of a pocketing anode 110 or a pocketing cathode surrounded by the separators 101 and 102 and the insulating members 115 and 125.

The first A-type bi-cell BC1 shown in FIG. 1 has a pocketing anode 110 as a basic structure when considering a stacked structure, and a double-sided cathode 121 and a double-sided cathode 121 on the pocketing anode 110 located at the bottom and It can be obtained by laminating the insulating member 125 and laminating the pocketing positive electrode 110 on the double-sided negative electrode 121 and the insulating member 125.

3 illustrates the pocketing anode 110 included in the first A-type bi-cell BC1. In the pocketing positive electrode 110, the positive electrode 111 coated with the positive electrode active material 113 on both sides of the positive electrode current collector 112 is surrounded by the separators 101 and 102 and the insulating member 115. That is, the electrode in the form of the anode 111 is positioned in the space formed by the upper and lower separators 101 and 102 and the insulating member 115 provided around the edge of the anode 111 is the pocketing anode 110 to be. However, the uncoated portion 119 of the anode 111 is not surrounded by the separators 101 and 102 and the insulating member 115 and is exposed to the outside. The pocketing anode 110 may also be referred to as an encapsulation positive electrode.

The manufacturing method of the pocketing positive electrode 110 or the characteristics of the positive electrode current collector 112, the positive electrode active material 113, the separators 101 and 102, and the insulating member 115 are described in Korean Patent No. 10-1168650 or Korean Patent No. 10. You can refer to the description in -1168651.

Referring to FIG. 3, it is preferable that a predetermined gap is formed between the edge of the anode 111 and the insulating member 115 surrounding the anode 111 in the pocketing anode 110. The insulating member 115 has a component that is bonded to the upper and lower separators 101 and 102, and may be provided in the form of an insulating polymer film.

The insulating member 115 is preferably provided to have a width W1 of a certain size along the periphery of the anode 111.

4 shows a cathode 120 including a double-sided cathode 121 and an insulating member 125 surrounding the cathode 121. The insulating member 125 is preferably formed of the same material as the insulating member 115 of the pocketing anode 110. Like the pocketing anode 110, it is preferable that a predetermined gap is formed between the double-sided cathode 121 and the insulating member 125. For convenience, an electrode body including the double-sided negative electrode 121 and the insulating member 125 is referred to as a first negative electrode 120. The insulating member 125 of the first negative electrode 120 is preferably provided to have a width W2 of a certain size along the circumference of the negative electrode 121.

Here, the edge of the pocketing anode 110 and the edge of the cathode 121, that is, the edge of the insulating member 125 forming the cathode 121 are identical. In other words, the pocketing anode 110 and the first cathode 120 have the same size. Referring to FIG. 1, it can be seen that the left and right ends of the pocketing anode 110 and the first cathode 120 in the first A-type bi-cell BC1 coincide with each other. However, the sizes of the anode 111 and the cathode 121 are not the same. The cathode 121 is larger than the anode 111.

As shown in FIG. 2, the pocketing anode 110 and the first cathode 120 must be stacked so that the edge of the anode 111 is located inside the edge of the cathode 121. To this end, it is preferable that the width W1 of the insulating member 115 forming the pocketing anode 110 is smaller than the width W2 of the insulating member 125 forming the first cathode 120. In addition, it is preferable that the edges of the separators 101 and 102 coincide with the edges of the pocketing anode 110 and the first cathode 120.

Referring to FIG. 1, the electrode assembly 100 according to the first embodiment of the present invention is positioned between at least two first A-type bi-cells BC1 and a first A-type bi-cell BC1 provided up and down. It may include a second cathode 141 and a third cathode 161 positioned above and below the first A-type bi-cell BC1 to face the second cathode 141 and the second cathode 141.

Here, the second negative electrode 141 is a double-sided negative electrode including the negative electrode current collector 142 and the negative electrode active material 143 coated on both surfaces of the negative electrode current collector 142, and the third negative electrode 161 is a negative electrode current collector ( 162 and a negative electrode active material 163 applied to one surface of the negative electrode current collector 162 facing the first A-type bi-cell BC1. The second cathode 141 and the third cathode 161 do not include an insulating member surrounding their edges.

The second negative electrode 141 is a double-sided negative electrode in which the negative electrode active material 143 is coated on both sides of the negative electrode current collector 142 because the pocketing positive electrode 110 of the first type A bi-cell BC1 is located above and below it. Should be. On the other hand, the third cathode 161 located at the top and bottom of the electrode assembly 100 is pocketing because the pocketing anode 110 of the 1 A-type bicell BC1 is located only on either side of the top and bottom. It is preferable to use a single-sided negative electrode on which the negative electrode active material 163 is applied only to one surface of the negative electrode current collector 162 facing the positive electrode 110.

Here, the second cathode 141 and the third cathode 161 may be formed in a shape or size that matches the edge of the first A-type bi-cell BC1. Accordingly, the electrode assembly 100 according to the first embodiment of the present invention includes a third cathode 161 as a single-sided cathode, a first A-type bicell BC1, a second cathode 141 as a double-sided cathode, and the first A. It may be formed by sequentially stacking the type bi-cell BC1 and the third cathode 161. At this time, since the edges of the electrode bodies BC1, 141 and 161 are coincident, alignment of the anode and the cathode can be ensured if the edges are aligned and stacked. If only the edges of the electrode bodies BC1, 141 and 161 match, the anode 111 is positioned inside the edges of the cathodes 121, 141 and 161, so that the alignment of the anode and the cathode can be ensured.

Therefore, since the electrode assembly 100 according to the first embodiment of the present invention does not need to stack an anode and a cathode one by one, the stacking speed can be increased, and alignment of the anode and the cathode can be achieved by matching only the edges of the electrode body. Because it can be secured, productivity can be increased.

Meanwhile, as shown in FIG. 5, it is preferable to stack the anode uncoated portion 119 and the cathode uncoated portion 129 so as not to overlap each other during lamination. As long as they do not overlap, the anode uncoated portion 119 and the cathode uncoated portion 129 may not be provided on the same side of the electrode assembly 100.

6 to 9 illustrate an electrode assembly 200 according to a second embodiment of the present invention.

6, the electrode assembly 200 according to the second embodiment of the present invention is formed in the order of a cathode 221 / a separator 102 / an anode 211 / a separator 101 / a cathode 221 It may include at least one first C-type bi-cell BC2.

Unlike the first A-type bi-cell BC1 of the electrode assembly 100 according to the first embodiment of the present invention, the first C-type bi-cell BC2 of the electrode assembly 200 according to the second embodiment of the present invention ), the cathode 221 is positioned at the top and bottom, respectively.

Referring to FIG. 6, an electrode assembly 200 including a bi-cell BC2 according to the second embodiment is provided between two first C-type bi-cells BC2 and a first C-type bi-cell BC2. It may include a second anode 231 of the double-sided anode positioned, and a third anode 251 of a single-sided anode disposed at the uppermost and lowermost ends, respectively. That is, the electrode assembly 200 including the bi-cell according to the second exemplary embodiment of the present invention comprises a third anode 251 of a single-sided anode, a first C-type bi-cell BC2, and a double-sided anode sequentially from the bottom. It may be formed by stacking the second anode 231, the first C-type bi-cell BC2, and the third anode 251 of a single-sided anode. In other words, when five electrode bodies BC2, 231 and 251 are stacked, an electrode assembly 200 in which the anode and the cathode face each other eight times can be obtained. In the conventional case, in order to obtain an electrode assembly in which the anode and the cathode face each other eight times, 9 electrode bodies must be stacked. Compared to the prior art, the electrode assembly 200 according to the second embodiment of the present invention reduces the number of stacking. Can speed up lamination

Here, the positive electrode 211 and the negative electrode 221 included in the first C-type bi-cell BC2 are electrode current collectors 212 and 222, electrode active materials 213 and 223 applied to both surfaces of the electrode current collectors 212 and 222, and electrode active materials. (213,223) includes uncoated portions (219,229, see Fig. 7), and is provided between the separation membranes 101 and 102 to surround the edges of the anode 211 and the cathode 221 except for the uncoated portions 219 and 229. An anode 211 and a cathode 221 may be provided in a space formed by the insulating members 215 and 225 and the separators 101 and 102.

Referring to Figure 6, the first C-type bi-cell (BC2), the separator 101, double-sided cathode 221, separator 102, double-sided anode 211, separator 101, double-sided in order from the bottom. The cathode 221 and the separator 102 are stacked to form one unit cell. Here, each of the double-sided cathode 221 and the double-sided anode 211 is provided between the separation membranes 101 and 102 provided up and down, and the separation membranes 101 and 102, but insulation provided along the edges of the cathode 221 or the anode 211 It is surrounded by members 225 and 215. That is, the cathode 221 or the anode 211 may be provided in the form of a pocketing cathode 220 or a pocketing anode surrounded by the separators 101 and 102 and the insulating members 225 and 215.

The first C-type bi-cell BC2 shown in FIG. 6 has a pocketing cathode 220 as a basic structure when considering a stacked structure, and a double-sided anode 211 on the pocketing cathode 220 positioned at the bottom. And the insulating member 215 is stacked, and a pocketing negative electrode 220 is stacked on the double-sided anode 211 and the insulating member 215. That is, the first A-type bicell BC1 of the electrode assembly 100 according to the first embodiment shown in FIG. 1 and the first C-type of the electrode assembly 200 according to the second embodiment shown in FIG. The bi-cell BC2 has an opposite stacking structure or order.

7 shows the pocketing cathode 220 included in the first C-type bi-cell BC2. In the pocketing negative electrode 220, the negative electrode 221 coated with the negative electrode active material 223 on both sides of the negative electrode current collector 222 is surrounded by the separators 101 and 102 and the insulating member 225. That is, an electrode in a shape in which the cathode 221 is located in the space formed by the upper and lower separators 101 and 102 and the insulating member 225 provided around the edge of the cathode 221 is the pocketing cathode 220 to be. However, the uncoated portion 229 of the cathode 221 is exposed to the outside without being surrounded by the separators 101 and 102 and the insulating member 225. The pocketing cathode 220 may be referred to as an encapsulation positive electrode.

However, as in the case of FIG. 1, the first C-type bi-cell BC2 may be obtained by laminating the cathode 221 on the lower and upper portions of the pocketing anode 210 as the basis of the pocketing anode 210. have.

On the other hand, referring to FIG. 7, it is preferable that a predetermined gap is formed between the insulating member 225 surrounding the cathode 221 and the edge of the cathode 221 in the pocketing cathode 220. The insulating member 225 has a component that adheres to the upper and lower separators 101 and 102, and may be provided in the form of an insulating polymer film.

It is preferable that the insulating member 225 is provided to have a width W4 of a certain size along the circumference of the negative electrode 221.

FIG. 8 shows an anode 210 including a double-sided anode 211 and an insulating member 215 surrounding the anode 211. The insulating member 215 is preferably formed of the same material as the insulating member 225 of the pocketing negative electrode 220. Like the pocketing cathode 220, it is preferable that a predetermined gap is formed between the double-sided anode 211 and the insulating member 215. For convenience, an electrode body including the double-sided anode 211 and the insulating member 215 is referred to as a first anode 210. The insulating member 215 of the first anode 210 is preferably provided to have a width W3 of a predetermined size along the periphery of the anode 211.

Here, the edge of the pocketing cathode 220 and the edge of the anode 211, that is, the edge of the insulating member 215 forming the anode 211 coincide. In other words, the pocketing cathode 220 and the first anode 210 have the same size. Referring to FIG. 6, it can be seen that the left and right ends of the pocketing cathode 220 and the first anode 210 in the first C-type bi-cell BC2 coincide with each other. However, the sizes of the cathode 221 and the anode 211 are not the same. The cathode 221 is larger than the anode 211. This is because the pocketing cathode 220 and the first anode 210 must be stacked so that the edge of the anode 211 is located inside the edge of the cathode 221. To this end, it is preferable that the width W4 of the insulating member 225 forming the pocketing cathode 220 is smaller than the width W3 of the insulating member 215 forming the first anode 210. In addition, it is preferable that the edges of the separators 101 and 102 coincide with the edges of the pocketing cathode 220 and the first anode 210.

Referring to FIG. 6, an electrode assembly 200 according to a second embodiment of the present invention is positioned between at least two first C-type bi-cells BC2 and a first C-type bi-cell BC2 provided vertically. It may include a second anode 231 and a third anode 251 positioned above and below the first C-type bi-cell BC2 to face the second anode 231 and the second anode 231.

Here, the second positive electrode 231 is a double-sided positive electrode including the positive electrode current collector 232 and the positive electrode active material 233 applied to both surfaces of the positive electrode current collector 232, and the third positive electrode 251 is a positive electrode current collector ( It is a single-sided positive electrode including a positive electrode active material 253 applied on one surface of the positive electrode current collector 252 facing the first C-type bi-cell BC2 and 252. The second anode 231 and the third anode 251 do not include an insulating member surrounding their edges.

The second positive electrode 231 is a double-sided positive electrode in which the positive electrode active material 233 is coated on both surfaces of the positive electrode current collector 232 because the pocketing negative electrode 220 of the first C-type bi-cell BC2 is located above and below it. Should be. On the other hand, the third anode 251 located at the top and bottom of the electrode assembly 200 is pocketing because the pocketing cathode 220 of the 1 C-type bicell BC2 is located only on either side of the top and bottom. It is preferable to use a single-sided positive electrode on which the positive electrode active material 253 is applied only to one surface of the positive electrode current collector 252 facing the negative electrode 220.

Here, the second anode 231 and the third anode 251 are formed in a shape or size smaller than the edge of the first C-type bi-cell BC2, or the anode included in the first C-type bi-cell BC2 ( 211) may be formed in the same shape or size. In the electrode assembly 200, the anodes 211, 231, and 251 must be smaller than the cathode 220 and must be aligned so as to be positioned inside the edge of the cathode 220 when stacked.

In the case of the electrode assembly 100 according to the first embodiment of the present invention, all the stacked electrode bodies have the same size or have the same edges, whereas the electrode assembly 200 according to the second embodiment of the present invention The second anode 231 positioned between the first C-type bi-cell BC2 and the third anode 251 positioned at the bottom are smaller in size than the first C-type bi-cell BC2 or the first C It must be aligned so that it is located inside the edge of the type bicell (BC2).

The electrode assembly 200 according to the second embodiment of the present invention may be more difficult to align the electrode body than the electrode assembly 100 according to the first embodiment of the present invention. This is because the second and third anodes 231 and 251 must be located inside the edge of the first C-type bi-cell BC2. However, when the electrode assembly 200 according to the second embodiment of the present invention is stacked, it is only necessary to align the edges of the anodes 231 and 251 inside the edge of the first C-type bi-cell BC2. Rather, it can be said that the alignment is accurate and easy.

Meanwhile, as shown in FIG. 9, it is preferable to stack the anode uncoated portion 219 and the cathode uncoated portion 229 so as not to overlap with each other during lamination. As long as they do not overlap, the anode uncoated portion 219 and the cathode uncoated portion 229 may not be provided on the same side of the electrode assembly 200.

10 shows an electrode assembly 300 according to a third embodiment of the present invention.

Referring to FIG. 10, the electrode assembly 300 according to the third embodiment of the present invention is formed in the order of an anode 111 / a separator 102 / a cathode 121 / a separator 101 / an anode 111 It may include at least one first A-type bi-cell BC1.

Referring to FIG. 10, an electrode assembly 300 according to a third embodiment of the present invention may include a double-sided cathode 141 positioned above and below at least one first A-type bi-cell BC1. That is, the electrode assembly 300 according to the third embodiment of the present invention includes a first A-type bi-cell BC1 positioned between at least two second cathodes 141 and second cathodes 141 provided vertically. , A second A-type bi-cell BC3 positioned above the second cathode 141 to face the first A-type bi-cell BC1, and a second cathode to face the first A-type bi-cell BC1 It may include a fourth anode 330 positioned under the 141.

Here, the first A-type bi-cell BC1 and the second cathode 141 are the first A-type bi-cell BC1 included in the electrode assembly 100 according to the first embodiment of the present invention shown in FIG. And the second cathode 141 has the same structure and stacked form, and thus, repeated and identical descriptions are omitted.

The second A-type bi-cell BC3 included in the electrode assembly 300 according to the third embodiment of the present invention is the first A-type bi-cell included in the electrode assembly 100 according to the first embodiment of the present invention. Like (BC1), the anode/separator/cathode/separator/anode are stacked in order, but the structure of the anode positioned at the top is different from that of the first type A bicell BC1. The pocketing positive electrode 110 positioned at the top of the first A-type bi-cell BC1 includes the positive electrode 111 coated with the positive electrode active material 113 on both surfaces of the positive electrode current collector 112, while the second The pocketing positive electrode 330 positioned at the top of the A-type bi-cell BC3 differs in that it includes the positive electrode 331 coated with the positive electrode active material 333 only on the end surface of the positive electrode current collector 332. That is, the positive electrode 331 included in the pocketing positive electrode 330 positioned at the top of the second A-type bi-cell BC3 is a positive electrode facing the positive electrode current collector 332 and the first A-type bi-cell BC1 A positive electrode active material 333 applied to one surface of the current collector 332 may be included.

In addition, at the lowermost end of the electrode assembly 300 according to the third embodiment of the present invention, the fourth anode 330 having the same structure or shape as the pocketing anode 330 positioned at the top of the second A-type bicell BC3. ) Can be located.

The fourth positive electrode 330 positioned below the second negative electrode 141 to face the first A-type bi-cell BC1 is a positive electrode facing the positive electrode current collector 332 and the first A-type bi-cell BC1 A separation film containing the positive electrode active material 333 applied to one surface of the current collector 332 and surrounding the edges of the positive electrode current collector 332 and the separators 101 and 102 positioned on the upper and lower surfaces of the positive electrode current collector 332 A positive electrode current collector 332 and a positive electrode active material 333 may be provided in the space formed by the insulating member 335 positioned between the 101 and 102.

As shown in FIG. 10, the electrode assembly 300 according to the third embodiment of the present invention includes a fourth anode 330 of a pocketing anode including a cross-section anode 331, and a first A-type bicell BC1. ), the second cathode 141 of the double-sided cathode and the second A-type bi-cell BC3 may be sequentially stacked from bottom to top.

In the electrode assembly 300 according to the third embodiment of the present invention, the first A-type bi-cell BC1, the second A-type bi-cell BC3, the second cathode 141 and the fourth anode 330 are It can be formed in a shape or size with matching edges. Accordingly, since the edges of the electrode bodies BC1, BC3, 141, and 330 coincide, alignment of the anode and the cathode can be ensured by simply stacking the electrode bodies BC1, BC3, 141 and 330 while matching the edges. If only the edges of the electrode bodies BC1, BC3, 141 and 330 are aligned, the anodes 111 and 331 are positioned inside the edges of the cathodes 121 and 141, so that the alignment of the anode and the cathode can be ensured.

11 shows an electrode assembly 400 according to a fourth embodiment of the present invention.

Referring to FIG. 11, the electrode assembly 400 according to the fourth embodiment of the present invention is formed in the order of an anode 111 / a separator 102 / a cathode 121 / a separator 101 / an anode 111 It may include at least one first A-type bi-cell BC1. Here, the first A-type bi-cell BC1 has the same structure and stacked form as the first A-type bi-cell BC1 included in the electrode assembly 100 according to the first embodiment of the present invention shown in FIG. Therefore, repeated and identical descriptions are omitted.

The electrode assembly 400 according to the fourth embodiment of the present invention illustrated in FIG. 11 includes a first A-type bi-cell BC1 and a second C-type bi-cell located above the first A-type bi-cell BC1. A second C-type bi-cell BC4 positioned below the cell BC4 and the first A-type bi-cell BC1 may be included.

The second C-type bi-cell BC4 included in the electrode assembly 400 according to the fourth embodiment of the present invention is the first C-type bi-cell included in the electrode assembly 200 according to the second embodiment of the present invention. Like (BC2), a cathode/separator/anode/separator/cathode is stacked in order, but the structure of the cathode positioned at the top is different from that of the first C-type bicell BC2. The pocketing negative electrode 220 positioned at the top of the first C-type bi-cell BC2 includes the negative electrode 221 coated with the negative electrode active material 223 on both sides of the negative electrode current collector 222, while the second The pocketing negative electrode 440 positioned at the top of the C-type bi-cell BC4 differs in that it includes the negative electrode 441 coated with the negative electrode active material 443 only on the end surface of the negative electrode current collector 442.

Referring to FIG. 11, a cathode 441 positioned at the top of a second C-type bi-cell BC4 positioned above the first A-type bi-cell BC1 is a negative electrode current collector 442 and a first A-type bi-cell BC1. A second C-type bi-cell BC4, which includes the negative active material 443 applied to one surface of the negative electrode current collector 442 facing the bi-cell BC1, and is located under the first A-type bi-cell BC1. The negative electrode 441 located at the bottom of the) may include a negative electrode current collector 442 and a negative electrode active material 443 coated on one surface of the negative electrode current collector 442 facing the first A-type bi-cell BC1. have. Here, the pocketing cathode 220 including the double-sided cathode 221 is located at the bottom of the second C-type bi-cell BC4, and the pocketing cathode 440 including the single-sided cathode 441 is located at the top.

The first anode 210 located in the middle of the second C-type bi-cell BC4 is the same as the first anode 210 included in the first C-type bi-cell BC2 according to the second embodiment of the present invention. .

The electrode assembly 400 according to the fourth embodiment of the present invention may be formed by alternately stacking one first A-type bi-cell BC1 and two second C-type bi-cells BC4. Here, the first A-type bi-cell BC1 and the second C-type bi-cell BC4 may be formed in a shape or size with matching edges. Accordingly, since the edges of the electrode bodies BC1 and BC4 coincide, alignment of the anode and the cathode can be ensured by simply stacking the electrode bodies BC1 and BC4 while matching the edges. If only the edges of the electrode bodies BC1 and BC4 coincide, the anodes 111 and 211 are positioned inside the edges of the cathodes 121, 221 and 441, so that the alignment of the anode and the cathode can be ensured.

Unlike the electrode assemblies 100, 200, and 300 according to the first to third embodiments of the present invention, the electrode assembly 400 according to the fourth embodiment of the present invention has a first A-type bi-cell BC1 and a second C-type bi-cell. Separators 101 and 102 are double (double-layered) stacked between the cells BC4. The anode 111 and the cathode 221 positioned above and below the two-layered separators 101 and 102 undergo an electrochemical reaction with each other, and the anodes 111 and 211 positioned above or below the single-layered separator. The reaction may be weaker than that the cathodes 121, 221, and 441 are electrochemically reacted with each other. This is because the two-layer separator may somewhat interfere with the electrochemical reaction. Accordingly, the electrode assembly 400 according to the fourth embodiment of the present invention has the size of the positive electrode 111 or the negative electrode 221 positioned above or below the two-layered separation membranes 101 and 102, or an active material coating area. It is possible to compensate for the weak reaction by forming a little larger.

12 shows an electrode assembly 500 according to a fifth embodiment of the present invention.

Referring to FIG. 12, the electrode assembly 500 according to the fifth embodiment of the present invention is formed in the order of a cathode 221 / a separator 102 / an anode 211 / a separator 101 / a cathode 221 It may include at least one first C-type bi-cell BC2. Here, the first C-type bi-cell BC2 has the same structure and stacked form as the first C-type bi-cell BC2 included in the electrode assembly 200 according to the second embodiment of the present invention shown in FIG. 6. Therefore, repeated and identical descriptions are omitted.

The electrode assembly 500 according to the fifth embodiment of the present invention illustrated in FIG. 12 includes a second A-type bi-cell located above the first C-type bi-cell BC2 and the first C-type bi-cell BC2. A second A-type bi-cell BC3 positioned below the cell BC3 and the first C-type bi-cell BC2 may be included.

Here, the second A-type bi-cell BC3 has the same structure and stacked form as the second A-type bi-cell BC3 included in the electrode assembly 300 according to the third embodiment of the present invention shown in FIG. Do. That is, the positive electrode 331 positioned at the top of the second A-type bi-cell BC3 positioned above the first C-type bi-cell BC2 is the positive electrode current collector 332 and the first C-type bi-cell BC2. ), including the positive electrode active material 333 applied to one surface of the positive electrode current collector 332 facing the second A-type bi-cell BC3, which is located under the first C-type bi-cell BC2. The positioned positive electrode 331 may include a positive electrode current collector 332 and a positive electrode active material 333 applied on one surface of the positive electrode current collector 332 facing the first C-type bi-cell BC2. Here, the pocketing anode 110 including the double-sided anode 111 is located at the bottom of the second A-type bi-cell BC3, and the pocketing anode 330 including the single-sided anode 331 is located at the top.

The electrode assembly 500 according to the fifth embodiment of the present invention may be formed by alternately stacking one first C-type bi-cell BC2 and two second A-type bi-cells BC3. Here, the first C-type bi-cell BC2 and the second A-type bi-cell BC3 may be formed in a shape or size with matching edges. Therefore, since the edges of the electrode bodies BC2 and BC3 coincide, alignment of the anode and the cathode can be ensured by simply stacking the electrode bodies BC2 and BC3 while matching the edges. If only the edges of the electrode bodies BC2 and BC3 match, the anodes 111, 211 and 331 are positioned inside the edges of the cathodes 121 and 221, so that the alignment of the anode and the cathode can be ensured.

Like the electrode assembly 400 according to the fourth embodiment of the present invention, the electrode assembly 500 according to the fifth embodiment of the present invention includes a first C-type bi-cell BC2 and a second A-type bi-cell BC3. ), the separators 101 and 102 are stacked in double (two layers). The anode 111 and the cathode 221 positioned above and below the two-layered separators 101 and 102 undergo an electrochemical reaction with each other, and the anodes 111, 211, and 331 positioned above or below the one-ply stacked separator. The reaction may be weaker than that of the cathodes 121 and 221 performing an electrochemical reaction with each other. This is because the two-layer separator may somewhat interfere with the electrochemical reaction. Accordingly, the electrode assembly 500 according to the fifth exemplary embodiment of the present invention has the size of the positive electrode 111 or the negative electrode 221 positioned above or below the two-layered separators 101 and 102, or the area of application of the active material. It is possible to compensate for the weak reaction by forming a little larger.

In the electrode assembly 100, 200, 300, 400, 500 including the bi-cell according to the present invention described above, the insulating member provided to surround the edge of the anode may be formed to have a larger width than the insulating member provided to surround the edge of the cathode. In addition, the cathode provided in the space formed by the insulating member and the separator may be formed to have a larger area than the anode provided in the space formed by the insulating member and the separator.

On the other hand, the present invention is a lithium secondary battery comprising an electrode assembly (100, 200, 300, 400, 500) including the bi-cell according to the present invention and a case (not shown) for sealing an electrolyte (not shown) together with the electrode assembly (100, 200, 300, 400, 500) Can provide knowledge. The electrode assembly 100, 200, 300, 400, 500 including the bi-cell according to the present invention becomes a lithium secondary battery when it is sealed and accommodated in a case (not shown) together with an electrolyte.

The electrode assemblies 100, 200, 300, 400, 500 including the bi-cell according to the present invention may be used not only for general lithium secondary batteries, but also for release cell type lithium secondary batteries. 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.

100,200,300,400,500: electrode assembly including bi-cell
101,102: separator
110,210,330: pocketing anode
111,211,231,251,331: anode
112,212,232,252,332: positive electrode current collector
113,213,233,253,333: cathode active material
115,125,215,225,335,445: insulation member
119,129,219,229: No branch
120: first cathode
121,141,161,221,441: cathode
122,142,162,222,442: negative electrode current collector
123,143,163,223,443: negative electrode active material
210: first anode
220,440: pocketing cathode
BC1: Type A bicell
BC2: Type C bicell
BC3: Type 2 A bicell
BC4: 2nd type C bicell

Claims (15)

Including at least one of a first A-type bi-cell formed in the order of an anode/separator/cathode/separator/anode or a first C-type bi-cell formed in the order of a cathode/separator/anode/separator/cathode,
The positive electrode and the negative electrode include an electrode current collector, an electrode active material applied to both surfaces of the electrode current collector, and a non-coated portion to which the electrode active material is not applied,
The anode and the cathode are provided in a space formed by the separator and an insulating member provided between the separator to surround edges of the anode and the cathode except for the uncoated part,
At least two of the first A-type bicells provided up and down;
A second cathode positioned between the first A-type bi-cell; And
Includes; a third cathode positioned above and below the first A-type bicell to face the second cathode, and
The second negative electrode includes a negative electrode current collector and a negative electrode active material coated on both surfaces of the negative electrode current collector,
The third negative electrode includes a negative electrode current collector and a negative electrode active material applied to one surface of the negative electrode current collector facing the first A-type bi-cell.
delete The method of claim 1,
The second cathode and the third cathode are electrode assembly comprising a bi-cell, characterized in that formed in a shape or size coinciding with an edge of the first A-type bi-cell.
Including at least one of a first A-type bi-cell formed in the order of an anode/separator/cathode/separator/anode or a first C-type bi-cell formed in the order of a cathode/separator/anode/separator/cathode,
The positive electrode and the negative electrode include an electrode current collector, an electrode active material applied to both surfaces of the electrode current collector, and a non-coated portion to which the electrode active material is not applied,
The anode and the cathode are provided in a space formed by the separator and an insulating member provided between the separator to surround edges of the anode and the cathode except for the uncoated part,
At least the two first C-type bi-cells provided up and down;
A second anode positioned between the first C-type bi-cell; And
Includes; a third anode positioned above and below the first C-type bi-cell to face the second anode,
The second positive electrode includes a positive electrode current collector and a positive electrode active material applied to both surfaces of the positive electrode current collector,
The third positive electrode includes a positive electrode current collector and a positive electrode active material applied to one surface of the positive electrode current collector facing the first C-type bi-cell.
The method of claim 4,
The second anode and the third anode are formed in a shape or size smaller than the edge of the first C-type bi-cell, or are formed in the same shape or size as the anode included in the first C-type bi-cell. An electrode assembly comprising a bi-cell.
Including at least one of a first A-type bi-cell formed in the order of an anode/separator/cathode/separator/anode or a first C-type bi-cell formed in the order of a cathode/separator/anode/separator/cathode,
The positive electrode and the negative electrode include an electrode current collector, an electrode active material applied to both surfaces of the electrode current collector, and a non-coated portion to which the electrode active material is not applied,
The anode and the cathode are provided in a space formed by the separator and an insulating member provided between the separator to surround edges of the anode and the cathode except for the uncoated part,
At least two second cathodes provided up and down;
The first A-type bi-cell positioned between the second cathode;
A second A-type bi-cell positioned above the second cathode to face the first A-type bi-cell; And
Includes; a fourth anode positioned under the second cathode so as to face the first A-type bi-cell,
The positive electrode positioned at the top of the second A-type bi-cell comprises a positive electrode current collector and a positive electrode active material applied to one surface of the positive electrode current collector facing the first A-type bi-cell. Electrode assembly.
The method of claim 6,
The fourth positive electrode positioned under the second negative electrode so as to face the first A-type bicell includes a positive electrode current collector and a positive electrode active material applied to one surface of the positive electrode current collector facing the first A-type bi-cell. Including,
The positive electrode current collector and the positive electrode active material are provided in a space formed by the separator positioned on the upper and lower surfaces of the positive electrode current collector and the insulating member positioned between the separator so as to surround the edge of the positive electrode current collector Electrode assembly comprising a bi-cell, characterized in that the.
The method of claim 7,
The first A-type bi-cell, the second A-type bi-cell, the second cathode, and the fourth anode are electrode assembly comprising a bi-cell, characterized in that formed in a shape or size with the same edge.
Including at least one of a first A-type bi-cell formed in the order of an anode/separator/cathode/separator/anode or a first C-type bi-cell formed in the order of a cathode/separator/anode/separator/cathode,
The positive electrode and the negative electrode include an electrode current collector, an electrode active material applied to both surfaces of the electrode current collector, and a non-coated portion to which the electrode active material is not applied,
The anode and the cathode are provided in a space formed by the separator and an insulating member provided between the separator to surround edges of the anode and the cathode except for the uncoated part,
The first type A bicell;
A second C-type bi-cell positioned above the first A-type bi-cell; And
Includes; a second C-type bi-cell located under the first A-type bi-cell,
The negative electrode positioned at the top of the second C-type bi-cell located on the first A-type bi-cell is a negative electrode current collector and a negative electrode applied to one surface of the negative electrode current collector facing the first A-type bi-cell Contains an active material,
The negative electrode located at the lowermost end of the second C-type bi-cell located under the first A-type bi-cell is a negative electrode current collector and a negative electrode coated on one surface of the negative electrode current collector facing the first A-type bi-cell Electrode assembly comprising a bi-cell, characterized in that it contains an active material.
The method of claim 9,
The electrode assembly comprising a bi-cell, characterized in that the first A-type bi-cell and the second C-type bi-cell are formed in a shape or size with matching edges.
Including at least one of a first A-type bi-cell formed in the order of an anode/separator/cathode/separator/anode or a first C-type bi-cell formed in the order of a cathode/separator/anode/separator/cathode,
The positive electrode and the negative electrode include an electrode current collector, an electrode active material applied to both surfaces of the electrode current collector, and a non-coated portion to which the electrode active material is not applied,
The anode and the cathode are provided in a space formed by the separator and an insulating member provided between the separator to surround edges of the anode and the cathode except for the uncoated part,
The first type C bicell;
A second A-type bi-cell positioned above the first C-type bi-cell; And
Includes; a second A-type bi-cell positioned under the first C-type bi-cell,
The positive electrode positioned at the top of the second A-type bi-cell located on the first C-type bi-cell is a positive electrode current collector and a positive electrode applied to one surface of the positive electrode current collector facing the first C-type bi-cell Contains an active material,
The positive electrode located at the bottom of the second A-type bi-cell located under the first C-type bi-cell is a positive electrode current collector and a positive electrode applied to one surface of the positive electrode current collector facing the first C-type bi-cell Electrode assembly comprising a bi-cell, characterized in that it contains an active material.
The method of claim 11,
The electrode assembly comprising a bi-cell, characterized in that the first C-type bi-cell and the second A-type bi-cell are formed in a shape or size with matching edges.
The method according to any one of claims 1 and 3 to 12,
The insulating member provided to surround the edge of the anode is formed to have a larger width than the insulating member provided to surround the edge of the negative electrode assembly comprising a bi-cell.
The method of claim 13,
The cathode provided in the space formed by the insulating member and the separator is formed to have a larger area than the anode provided in the space formed by the insulating member and the separator. Electrode assembly including a cell.
The electrode assembly according to any one of claims 1 and 3 to 12; And
A lithium secondary battery comprising a case for sealingly storing an electrolyte solution together with the electrode assembly.

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