Art
[1]
The present invention relates to an electrode assembly including an electrode lead coupled to the long side portions.
BACKGROUND
[2]
Recently, the prices of energy resources due to the depletion of fossil fuels, are amplified interest in environmental pollution, the demand for eco-friendly alternative sources of energy has become an indispensable factor for the future life. In nuclear power, solar power, and is continuing research for a variety of power generation technologies, such as wind power, tidal power, the power storage device to use the thus producing energy in a more efficient and also it leads a great interest.
[3]
In particular, the demand for batteries as an energy source has rapidly increased with the development of technology and demand for mobile devices increases, many studies have been made on batteries that can meet a variety of needs accordingly.
[4]
Typically, the shaped surface of the battery is high, the demand for prismatic secondary batteries or pouch type secondary battery which can be applied to products such as a mobile phone, a small thickness, the material surface in with the advantages of high energy density, discharge voltage, output stability the high demand for lithium secondary batteries such as lithium ion batteries, lithium ion polymer batteries.
[5]
Further, the secondary battery has a positive electrode, a negative electrode, and a bar, typically to be classified, depending on whether the membrane is made up of any structure, the electrode assembly of the stacked structure which is interposed between the positive electrode and the negative electrode is, of the long sheet-like positive and negative electrodes of the structure winding in a separator is interposed state jelly-roll type (wound type) electrode assembly, a stacked sequentially stacking a plurality of positive and negative one cut out in units of a predetermined size in a state of sandwiching the membrane-type (stack-type) electrode assembly and the like, in recent years, the jelly-to address the roll-type electrode assembly and a stacked-type electrode problem assembly having the jelly-as an electrode assembly of a step forward structure is mixed in the form of rolled and stacked, the predetermined unit stack structure in which the take-up sequentially in a state in which the position of a unit cell stacking the positive electrode and the negative electrode in a state of sandwiching the membrane on the separation film / folding type electrode Developed body lip.
[6]
Further, secondary batteries according to the shape of the battery case, the electrode assembly is a cylindrical battery and a prismatic battery that is embedded in a metallic can of cylindrical shape or square shape, the electrode assembly is an aluminum laminate sheet pouch case pouch-shaped battery that is embedded in the type of It is classified.
[7]
In particular, recently, a stack type or stacking / folding type electrode assembly or the like is a pouch-shaped cell having a structure built in a pouch-shaped battery case made of aluminum laminate sheet, and low manufacturing cost, small weight, easy deformation reasons, to collect interest and also its usage increase gradually.
[8]
Figure 1 shows an exploded perspective view showing the structure of a conventional pouch-type battery cell is illustrated schematically.
[9]
1, the pouch-shaped battery cell 100, an electrode which is welded to the electrode assembly 130, the electrode assembly extend from the electrode taps 131 and 132 with 130, the electrode tabs 131 and 132 It is configured to include a battery case 120 for receiving the leads 140 and 141, and the electrode assembly 130.
[10]
The electrode assembly 130 includes a battery element is a positive electrode and the negative electrode are sequentially stacked on a separator is interposed state, consists of a stack type or stacking / folding type structure of the electrode taps 131 and 132 are electrode assembly 130 the extend from each electrode plate, the electrode leads 140 and 141 is with a plurality of electrode tabs (131, 132) extending from each plate, for example, and are electrically connected by welding, a battery case ( 120) is partially exposed to the outside of the addition, the electrode leads 140 and 141 in some cases, to increase the sealing degree between the battery case 120, top and bottom insulation films (150 to ensure the electrical insulation at the same time) is attached It is.
[11]
A battery case 120 is made up of a case body 122 and that the main body 122, lid 121, which is connected integrally with the containing compartment (123) having a concave shape which can be mounted an electrode assembly 130, and, the number of coupling the contact area of ​​the two side portions 124 and the upper end 125 of the electrode assembly 130 to the housing 123 in a housed state by completing a cell. battery case 120 is a resin layer / barrier Property in consists of a metal layer / heat-meltable aluminum laminate structure of the resin sealant layer, mutually welding the two side portions 124 and the upper end 125 may applying heat and pressure to the part layers of the cover 121 and the body 122 to each other in contact by forms in which the sealing excess portion binding. two side portions 124 of it in contact directly, the same resin layers of the upper and lower battery case 120, it is possible to uniformly sealed by melting. on the other hand, the electrode leads upper end 125 ( 140, 141) it is a protruding electrode, so It leads 140 and 141 thickness, and the battery case 120 by considering the heterogeneity of the material of the electrode lead so as to ensure a high sealing property in a state of interposing the insulating film 150 between the 140 and 141 of heat thereby fusing.
[12]
Generally, the pouch-shaped battery cell having such a structure is made of the electrical connection to the external device via the connection part of the electrode taps and the electrode leads.
[13]
However, and can result in relatively sufficient advantage can not be a problem between the operation of the battery cells in accordance with such a structure because of the relatively spaced electrode assembly site is the mobility of electrons and ions lowers from the electrode tabs.
[14]
Further, this problem is the more cost as around a relatively long structure, the outer planar electrode tab of the electrode assembly are not projected, is in the region of the electrode assembly spaced away from the electrode tab structure, may be more deteriorated, the electrode assembly a non-uniform use of the by accelerate the degradation of the local electrode, reducing the life of the battery cell and, by generating a localized degradation, may act as a factor to lower the safety of the electrode assembly.
[15]
Thus, the higher the need for in possible to solve this technical problem situation.
Detailed Description of the Invention
SUMMARY
[16]
An object of the present invention is to solve the technical problem, which has been requested from the problems, and of the prior art.
[17]
The inventors of the present application are such that, combined in a long side of the relatively long length, one of the electrode leads to the electrode taps, forming at least two electrode tabs, respectively, as described later at the end of extensive research and various experiments in depth, configuration whereby, in contrast with the conventional electrode assembly for a utilization for the electrode assembly site remote from the electrode taps decreases, can be uniform utilization of all areas of the electrode assembly, and thus, the electrode assembly having the long length of and be able to avoid the problem of reduced life characteristic according to a non-uniform degradation, by solving the problem of safety deterioration in a localized deterioration, in spite of the electrode assembly having a longer length, it can exhibit a more excellent life characteristics and safety It confirmed that, thus completing the present invention.
Problem solving means
[18]
Tab compared to the case by a predetermined tension occurs, that is coupled to a surface in which the positive electrode tab and negative electrode tab located at the inner side of the positive electrode lead and negative electrode lead, may form a more stable combined structure.
[19]
On the other hand, the positive electrode tab and the negative electrode tab, which from the electrode tab coupled adjacent to the other surface of the positive electrode lead and negative electrode lead, toward the electrode tab coupled to the spaced-apart position, the length protruding from the long side continuously or decrease discontinuously the structure may be.
[20]
The more More specifically, in the case where the positive electrode tab and negative electrode tab coupled to the other surface of the positive electrode lead and negative electrode lead, from the positive electrode tabs and negative tabs, the combined adjacent to the other surface of the positive electrode lead and negative electrode lead electrode tab, and the engaging site may be a more spaced apart from the structure.
[21]
Thus, the positive electrode tab and the negative electrode tab, from the electrode tab coupled adjacent to the other surface of the positive electrode lead and negative electrode lead, toward the electrode tab coupled to the spaced-apart position, to the distance from the connecting portion decreases from the long side, and and thus, by way, toward the electrode tab coupled to a from the electrode tab coupled adjacent to the other surface of the positive electrode lead and negative electrode lead, spaced-apart position, the length protruding from the long side continuously or discontinuously reduced, of the electrode assembly it is possible to minimize the deformation of the electrode tab, which is generated between the one surface of the long side portion and the electrode leads, and therefore, it is possible to eliminate or minimize the problems that can occur due to damage of the electrode tabs, the long side and the electrode of the electrode assembly between one surface of the lid, there are superimposed to minimize the space caused by the position of the electrode tabs, wherein It is possible to minimize the size of the electrode assembly.
[22]
In one specific example, one face of the positive electrode lead and negative electrode lead positioned on the inner side facing the long sides of the electrode assembly, it may be a structure in which each of the additional insulating material.
[23]
Thus, the insulation improvement of the positive electrode lead and negative electrode lead being, the one surface of the positive electrode lead and negative electrode lead can be prevented in the long side portion of the electrode assembly, the cross-polar with two different internal short circuit which may occur by the cathode and respectively in contact with the positive electrode effectively .
[24]
In this case, the insulating material may be an insulating tape or an insulating coating layer, not necessarily that the insulating material is not limited thereto, and at the same time exhibiting a stable bond to the surface of the positive electrode lead and a negative lead, so long as it exhibits a sufficient insulating property, the material to which the structure is not greatly limited.
[25]
In addition, the positive electrode lead and negative electrode lead, the end portion can be protruded or extended, and the same short side direction, or respectively extended, and a protruding structure in different short side direction.
[26]
That is, being the positive electrode lead and negative electrode lead, in each coupled to the positive electrode tabs and negative electrode taps protrude to the long side part state, extending and projecting in the short side direction of the electrode assembly, and respectively form a positive terminal and a negative terminal, in which case on the positive electrode lead and negative electrode lead, thereby to each other, each extending and projecting in the same short side direction or a different short-side direction, or both the positive terminal and the negative terminal on the same short side forming, respectively, a positive terminal to the short side direction opposite to each other and it may be made of a structure in which a cathode terminal is formed.
[27]
Here, the positive electrode lead and negative electrode lead, according to the desired purpose and structure of the electrode assembly, whereby both extending and projecting in the positive electrode short-side direction, forming two positive electrode terminals and two negative terminals, or two positive terminal of the first that of the negative electrode terminal, may be made to the structure that forms the positive terminal and one negative terminal 2 as a matter of course.
[28]
On the other hand, the electrode assembly may be formed of a separator having a lamination structure that is interposed between the positive electrode, a negative electrode and the positive electrode and the negative electrode.
[29]
In addition, the electrode assembly may be composed of more than one unit cell is the laminated structure consisting of a layered structure separation membrane interposed between the positive electrode, a negative electrode and the positive electrode and the negative electrode.
[30]
In other words, the electrode assembly may be, more easily the projecting structure of the electrode tabs by a structure, which may be the electrode taps protrude to the more spaced apart from each other stones of the long side portion, made of an a stacked structure or a lamination and a stack-like structure It can be formed.
[31]
However, this is the electrode taps protruding from the two or more portions mutually spaced apart in the long side, there can be achieved a structure which can be coupled respectively to one electrode lead, not necessarily the structure of the electrode assembly is not limited thereto, and more particularly a is, or comprises a positive electrode sheet and negative electrode sheet with the separator sheet is wound in one direction from the through state-wrapping type structure between the plurality of unit cells are wound while positioned on a separator sheet, in one direction a stack and which may consist of a folding structure is a matter of course.
[32]
The present invention is a bar, the battery case to provide a battery cell in which the electrode assembly is housed in the battery case may be a pouch-shaped case comprises a rectangular casing or metal layer and a resin layer made of a metal can.
[33]
Since the remaining structure of the electrode assembly except for the configuration to structure are known in the art, detailed description thereof in this specification will be omitted.
Brief Description of the Drawings
[34]
Figure 1 is an exploded perspective view showing the structure of a conventional pouch-shaped battery cell, schematically;
[35]
Figure 2 is a schematic view schematically showing a structure of an electrode assembly according to an embodiment of the invention;
[36]
Figure 3 is a schematic view schematically showing a vertical sectional structure of the negative electrode lead of Figure 2;
[37]
Figure 4 is a schematic view showing, on an enlarged scale, a structure of the "A" part of Figure 3;
[38]
5 is a schematic view schematically showing a structure of an electrode assembly according to still another embodiment of the present invention.
Best Mode for Carrying Out the Invention
[39]
Or less, and more detail the present invention with reference to the drawings according to an embodiment of the present invention but is not the scope of the present invention is not limited by it.
[40]
Figure 2 shows a schematic view schematically showing a structure of an electrode assembly according to one embodiment of the invention.
[41]
2, the electrode assembly 200 consists of a rectangular structure that includes two long sides in a plane (201, 203) and two the two short sides (202, 204).
[42]
Positive electrode tabs (211, 212) has a first projecting in mutually spaced two places portions of the long side 201 and the negative electrode tabs (221, 222) has a second cross-spaced two places portions of the long side (203) It protrudes from the.
[43]
Positive electrode tabs (211, 212) and the negative electrode tabs 221 and 222 are respectively projected on the first long side 201 and the second long side portion at 203, which are opposed to each other.
[44]
The first long side 201 portion and a second long side 203 portion has the anode lead 231 and anode lead 232 are located, respectively, the positive electrode tabs 211 and 212 and the negative electrode tabs 221 and 222 are positive electrode lead It is coupled respectively to 231 and the anode lead 232.
[45]
The length of the long side (201, 203) is made into a size of about 270% for the length of the short sides 202,204.
[46]
A cathode lead 231 and anode lead 232 are respectively the one end (231a, 232a), a first short side (202) extending in a direction and the extrusion.
[47]
Thus, the electrode concentrated in assembly 200 includes a first short side 202 or second short side 204, a positive electrode tab and the negative electrode tab, the electrode tabs (211, 212, 221, 222) as compared with the conventional electrode assembly, formed at the It can be dispersed, and that the movement of electrons, and thus, the movement of the electron concentration can be prevented thereby effectively increases the resistance and the resulting problems and problems of stability reduction of the output degradation that may occur.
[48]
Figure 3 shows a schematic view schematically showing a vertical sectional structure of the negative electrode lead of Fig.
[49]
3, the negative electrode lead 232 is bent perpendicular to the coupling in the negative electrode tabs (222a, 222b) state, one face (232b) opposite to the second long side 203 of the electrode assembly 200.
[50]
A negative electrode tabs (222a, 222b) are each coupled to the other surface (232c) of the negative electrode lead 232 is located on the outer side opposite to the second long side 203 of the electrode assembly 200.
[51]
A negative electrode tabs (222a, 222b) is from the negative electrode tab (222a) coupled adjacent to the other surface (232c) of the negative electrode lead 232, goes into the negative electrode tab (222b) coupled to the spaced-apart position, the second long side 203, the length protruding from gradually decreases.
[52]
Thus, the second long side 203, it is possible to minimize the deformation of the negative electrode tabs (222a, 222b) which is generated between the part and a surface of a negative electrode lead (232), (232b), In this way, the negative electrode tabs of the electrode assembly 200 between (222a, 222b), damage to the second long side 203 and the one surface of the negative electrode lead (232), (232b), the result is possible to eliminate or minimize the problems that can occur, the electrode assembly 200, the superimposed position a negative electrode tabs (222a, 222b) that it is possible to minimize the amount of space that is caused, it is possible to minimize the size of the electrode assembly 200.
[53]
Width (T1) of the anode lead 232 to the thickness (T2) of the electrode assembly 200, it consists of a size of about 85%.
[54]
Thus, the close contact in the anode lead 232, cathode tabs second long side 203 of the (222a, 222b) at the same time providing enough space is combined, a negative electrode lead 232. The electrode assembly 200 in the sun prevented from protruding in the top and bottom direction of the electrode assembly 200, it is possible to form a more uniform outer surface.
[55]
Figure 4 shows a schematic view showing, on an enlarged scale, a structure of the "A" portion of FIG.
[56]
Referring to Figure 4 together with Figure 3, has a surface (232b) of the negative electrode lead 232 is positioned on the inner side facing the second long side 203 of the electrode assembly 200 is attached to the insulating tape 240.
[57]
Therefore, insulation is improved between the second long side 203 and the anode lead 232 of the electrode assembly 200, whereby the second long side 203 of the one surface (232b) of the negative electrode lead 232. The electrode assembly 200 in part, it is possible to effectively prevent an internal short circuit in the polarity can be generated by contact with a different cathode.
[58]
Here, the insulation tape 240 may be made of a double-sided insulating tape so as to improve the adhesion to the second long side 203 of the electrode assembly 200 as a matter of course.
[59]
5, there is shown a schematic diagram schematically showing a structure of an electrode assembly according to still another embodiment of the present invention.
[60]
5, the electrode assembly 500 includes a positive electrode tabs (511, 512, 513) the first and protrude in mutually spaced three locations part of the first long side 501, the negative electrode tabs (521, 522, 523 ) it is projected from mutually spaced areas of the three locations of the second long side 503.
[61]
Positive electrode tabs (511, 512, 513) and the negative electrode tabs (521, 522, 523) are respectively projected on the first long side 501 and a second long side (503), the portions which are opposed to each other.
[62]
A cathode lead 531 and anode lead 532, the electrode first long side 501 and the second long side 503 in a region, the positive electrode tabs (511, 512, 513) and the negative electrode tabs (521 of the assembly 500, 522, are coupled respectively to 523), and is one end (531a) and the other side end portion (532a) is extended and protruded respectively, a first short side 502 and the second short side 504 direction.
[63]
Since the remaining structure other than the above structure equal to the electrode assembly of Figure 2, detailed description thereof will be omitted.
Mode for the Invention
[64]
Further described the invention with reference to the embodiment of this invention, but is not the scope of the present invention is not limited by it.
[65]
Electrode assembly produced
[66]

[67]
By laminating with a separator is interposed state between an anode and a cathode, consisting of a planar rectangular structure, and a long side length consists of a size of 130% over the length of the short side, each other of the positive electrode tab and the negative tab is one short side, respectively were prepared, one electrode assembly is formed in the spacing region.
[68]

[69]
By laminating with a separator is interposed state between an anode and a cathode, the plane consists in a rectangular structure, and a long side length consists of a size of 270% over the length of the short side, the positive electrode tab and the negative electrode tab, the center of each of the two sides the long side respectively, were prepared, one electrode assembly is formed in part.
[70]

[71]
The positive electrode and by laminating with a separator is interposed between the cathode state, the plane consists in a rectangular structure, and a long side length consists of a size of 270% over the length of the short side, the positive electrode tab and negative electrode tab respectively opposite sides long side 3 is formed by one, and one cathode lead coupled to the anode tabs at the same time, to thereby prepare a structure in which a cathode lead coupled to the cathode at the same time taps electrode assembly.
[72]

[73]
Except that the positive electrode tab and the negative electrode tab is formed on one mutually spaced regions on one side and short side, respectively, was prepared an electrode assembly having the same capacity and size as in Example 1.
[74]
Cells producing
[75]
By sealing it was described in Example 1, and an electrode assembly prepared in Comparative Example 1 with the electrolytic solution impregnated in the pouch-shaped battery case, to prepare a pouch-shaped battery cell.
[76]

[77]
Resistance Analysis
[78]
Example 1 and Comparative Example 1 measured a capacity of the battery cells, a resistor, and the total area of ​​the anode prepared in each discharge area specific resistance and the results are shown in Table 1.
[79]
TABLE 1
See, for example, Comparative Example 1 Example 1 Example 2
Capacity (Ah, 0.33C) 45 95 95 95
Resistance R dis (mOhm, SOC50, 10s) 2.654 1.088 0.9 0.78
Anode total area (m 2 ) 0.740 2.665 2.665 2.665
Discharge area specific resistance (mOhm X m 2 , SOC50, 10s) 1.964 2.899 2.399 2.079

[80]
As seen in Table 1, the exemplary case where the long side length made of a size of 270% over the length of the short side, the electrode tabs are formed at the long side portion Example 1, the electrode tabs are compared to Comparative Example 1 formed on the short side portion , a capacitor and a positive electrode total area can be found that is less than the same, while the resistance and the discharge area specific resistance, which, carried out in the case of example 1, shortened as compared to the Comparative example 1, the distance up to the parts of the electrode assembly from the electrode tab Accordingly, it means that the resistance is decreased, and thus indicates that it is possible to prevent the output reduction in the battery cell including the electrode assembly.
[81]
In addition, it is possible to determine the respective three electrode tabs are formed of a second embodiment of the case, the long side length of the discharge area ratio represents the resistance similar to the Reference Example comprising a size of 130% over the length of the short sides on both sides of long side portion.
[82]
Accordingly, the long side length of the electrode assembly is at least 200% of the length of the short side, the electrode tab is a long side portion, and more particularly, by being formed in spaced apart two or more parts of the long side portions, leading to the parts of the electrode assembly as the distance is shortened relatively, to reduce the discharge area specific resistance it can be easily seen that to improve the output characteristics of the battery.
[83]

[84]
Capacity maintenance rate analysis
[85]
Example 1 and Comparative Example after the battery cell manufactured in the first charge and discharge for 500 cycles with CC / CV mode, the upper limit voltage is 4.25V at room temperature, 25 degrees Celsius, and measuring the capacity maintenance rate, the results shown in Table 2 It was.
[86]
TABLE 2
One cycle the remaining capacity (%) 500 cycles remaining capacity (%)
Example 1 99.9 87.2
Comparative Example 1 99.9 73.5

[87]
As seen in Table 2, in Example 1, compared to Comparative Example 1, it can be seen that enables a uniform utilization of all areas of the electrode assembly, even after 500-cycle capacity retention rate of at least 87.2%. On the other hand, Comparative for example, one may determine by the reduced leverage for the electrode assembly, the short side parts remote from the electrode tab portion is located, the partial degradation is accelerated, the capacity retention rate considerably low compared to the embodiment as 73.5%.
[88]
Accordingly, the long side length of the electrode assembly is at least 200% of the length of the short side, the electrode tab being formed on the long side portion, as becomes possible that a uniform utilization of all areas of the electrode assembly, to improve the life characteristics of the battery that the can be easily seen.
[89]
Has been described with above with reference to the drawings according to an embodiment and embodiment of the invention, those skilled in the art that the present invention, that various and modifications of the accompanying claims within the scope of the invention It will be possible.
Industrial Applicability
[90]
As described above, the electrode assembly according to the present invention, formation of a relatively long length, more than one electrode tab in the long side of, and configured such that one electrode lead is coupled to each of the electrode tabs being, away from the electrode tabs the contrast with the conventional electrode assembly for a utilization of the electrode assembly parts decreases, it can be uniform utilization of all areas of the electrode assembly, and, thus, life characteristics of the non-uniform degradation of the electrode assembly having the long length and can prevent a problem of deterioration, there is an effect that, by solving the problem of safety deterioration in a localized deterioration, in spite of the electrode assembly having a longer length, can exhibit a more excellent life characteristics and safety.

Claims
[Claim 1]
In a plane consisting of a rectangular structure comprising two long sides and two short sides; The two long sides in, the positive electrode tab protruding from the two or more portions of the first long side spaced apart from each other, and a contains a negative electrode tab protruding from the two or more portions of the two long sides spaced apart from each other, respectively; The positive electrode tab and the negative electrode tab, the electrode assembly is characterized in that coupled to each one of the positive electrode lead and negative electrode lead located in a first longitudinal portion and second longitudinal portion.
[Claim 2]
The method of claim 1, wherein the electrode assembly, characterized in that the length of the long side is at least 200% of the size for the length of the short side.
[Claim 3]
The method of claim 1, wherein the positive electrode tab and the negative electrode tab, the electrode assembly, characterized in that respectively protrude to the first long side and the second long side, of three or more places spaced from each other the same distance region.
[Claim 4]
The method of claim 1, wherein the electrode assembly in the positive electrode tab and negative electrode tab includes: a first long side and a second long side, characterized in that each projection is in the area facing each other.
[Claim 5]
The method of claim 1, wherein in the state coupled to the positive electrode lead and negative electrode lead, respectively, the positive electrode tab and the negative electrode tab, the electrode assembly, characterized in that it is perpendicularly bent to one side facing to the longer side of the electrode assembly.
[Claim 6]
The method of claim 5, wherein the electrode assembly of the positive electrode tab and width is characterized in that the amount of 50% to 100% of the thickness of the electrode assembly of the positive electrode lead and negative electrode lead corresponding to the protruding direction of the negative electrode tab.
[Claim 7]
The method of claim 5, wherein the positive electrode tab and the negative electrode tab, the electrode assembly is characterized in that coupled to each of the other surface of the positive electrode lead and negative electrode lead which is located on the outer side opposite to the long side of the electrode assembly.
[Claim 8]
The method of claim 5, wherein the positive electrode tab and the negative electrode tab, from the electrode tab coupled adjacent to the other surface of the positive electrode lead and negative electrode lead, toward the electrode tab coupled to the spaced-apart position, the length protruding from the long continuous or non- an electrode assembly which comprises continuously decreases.
[Claim 9]
The method of claim 5, wherein the electrode assembly is characterized in that each insulating material has a surface of positive electrode lead and negative electrode lead positioned on the inner side facing the long sides of the electrode assembly is added.
[Claim 10]
10. The method of claim 9, wherein said insulating material is an electrode assembly, characterized in that an insulating tape or an insulating coating layer.
[Claim 11]
The method of claim 1, wherein the positive electrode lead and negative electrode lead, or one end of the extending and projecting in the same direction of the short side, or the electrode assembly, characterized in that the respective extensions and protrude to different short-side direction.
[Claim 12]
The method of claim 1, wherein the electrode assembly comprises an electrode assembly, characterized in that a separator interposed between the positive electrode, a negative electrode and the positive electrode and the negative electrode made of a laminate structure.
[Claim 13]
The method of claim 1, wherein the electrode assembly comprises an electrode assembly, characterized in that two or more unit cells consisting of a stacked separator interposed between the positive electrode, a negative electrode and the positive electrode and the negative electrode composed of a lamination structure.
[Claim 14]
Cells, characterized in that the electrode assembly according to claim 1 is housed in a battery case.
[Claim 15]
15. The method of claim 14, wherein the battery case has a battery cell, characterized in that the pouch-shaped case comprises a rectangular casing or metal layer and a resin layer made of a metal can.