Title of the invention: Hexagonal columnar battery cell and its manufacturing method, and battery module including the same
Technical field
[One]
The present invention relates to a battery cell having a hexagonal column shape, a manufacturing method thereof, and a battery module including the same. More specifically, the present invention provides an electrode assembly having a structure capable of preventing damage to the electrode active material at the corner of the hexagonal column by loading the electrode active material on the electrode current collector at a predetermined interval. It relates to a battery cell of a hexagonal column shape manufactured by using and a manufacturing method thereof, and a battery module including the same. This application is an application for claiming priority for Korean Patent Application No. 10-2018-0106083 filed on September 5, 2018, and all contents disclosed in the specification and drawings of the application are incorporated herein by reference.
Background
[2]
In manufacturing a battery module including a plurality of battery cells, when cylindrical battery cells are used, empty spaces formed between adjacent battery cells are inevitably increased, which is disadvantageous in terms of energy density.
[3]
In addition, in the case of using a cylindrical battery cell, even if a cooling plate is interposed between the battery cells for cooling, the contact area between the battery cell and the cooling plate is inevitably narrowed due to the shape of the side surface of the cylindrical battery cell, thereby reducing cooling efficiency. There is a problem.
[4]
Of course, if the bottom surfaces of the cylindrical battery cells and the cooling plate are in contact, the contact area can be increased, but in this case, it takes time for the heat generated from the center of the battery cell to be conducted to the bottom surface of the battery cell. Since it takes, efficient cooling is difficult.
[5]
When the shape of the battery cell is manufactured in a hexagonal column shape, there is an advantage of eliminating or minimizing empty spaces formed between battery cells. As described above, in order to manufacture a battery cell having a hexagonal column shape, it is preferable to accommodate an electrode assembly having a hexagonal column shape in a cell case having a hexagonal column shape in terms of energy density and improvement of cooling efficiency through the cell case.
[6]
However, when manufacturing an electrode assembly in the shape of a hexagonal column using a conventional electrode having a shape in which the electrode active material is continuously loaded on the electrode current collector, the electrode active material is also in the part where the electrode is bent, that is, at the corner of the hexagonal column. Since they are bent together, a phenomenon such as cracking or dropping of the electrode active material may occur, which may lead to deterioration of the quality of the battery cell and the battery module.
[7]
Therefore, in manufacturing a battery cell in a hexagonal column shape, it is required to develop a technology for preventing damage and/or dropping of the electrode active material.
Detailed description of the invention
Technical challenge
[8]
The present invention has been invented in consideration of the above-described problems, and in packing a plurality of battery cells for manufacturing a battery module, it is an object of the present invention to have a shape of the battery cell in a hexagonal column shape to increase energy density. To do.
[9]
In addition, the present invention is an electrode assembly structure that prevents damage and/or dropping of the electrode active material at the corners of the hexagonal column in manufacturing the electrode assembly of the hexagonal column applied for manufacturing the battery cell of the hexagonal column shape Its purpose is to provide.
[10]
However, the technical problem to be solved by the present invention is not limited to the above-described problems, and other problems that are not mentioned will be clearly understood by those skilled in the art from the description of the invention described below.
Means of solving the task
[11]
A battery cell according to an embodiment of the present invention for solving the above-described problems includes an electrode assembly having a hollow structure in which a hexagonal column-shaped hole is formed in a central portion, and an outer shape having a hexagonal column shape; And a cell case accommodating the electrode assembly and having a hexagonal column shape. Includes.
[12]
The electrode assembly may include: a first electrode including a first electrode current collector and a first electrode active material block discontinuously coated on the first electrode current collector at a predetermined interval; A second electrode including a second electrode current collector and a second electrode active material block discontinuously coated on the second electrode current collector at a predetermined interval; And a separator interposed between the first electrode and the second electrode. It may include.
[13]
The first electrode is bent in a first uncoated region formed between adjacent first electrode active material blocks, and the second electrode is bent in a second uncoated region formed between adjacent second electrode active material blocks Can be.
[14]
The first electrode active material block and the second electrode active material block may have a longer length as they are located farther from the center of the cross section of the electrode assembly.
[15]
A separator may be interposed between the outermost surface of the electrode assembly and the inner surface of the cell case.
[16]
On the other hand, the battery cell manufacturing method according to an embodiment of the present invention for solving the above-described problem, by discontinuously forming the first electrode active material block at a predetermined interval on at least one surface of the first electrode current collector Providing a first electrode; Forming a second electrode active material block discontinuously with a predetermined interval on at least one surface of the second electrode current collector to provide a second electrode; Forming a laminate comprising a first electrode, a second electrode, and a separator stacked such that a separator is interposed between the first electrode and the second electrode; Winding the stacked body so that the outer shape of the electrode assembly becomes a hexagonal column shape; And accommodating the electrode assembly on which winding is completed in a case. Includes.
[17]
When the first electrode active material is sequentially grouped by six from the point where the winding starts, the lengths of the first electrode active material blocks belonging to the same group are the same, The length of the 1 electrode active material block may be longer.
[18]
When the six second electrode active material blocks are sequentially grouped from the point where the winding starts, the lengths of the second electrode active material blocks belonging to the same group are the same, and the group is located further from the point where the winding starts. The length of the second electrode active material block belonging to the block may be longer.
[19]
The step of winding the laminate may include bending the laminate around a first uncoated region formed between discontinuously formed first electrode active material blocks and a second uncoated region formed between second electrode active material blocks. It may be a step to do.
[20]
A battery module according to an embodiment of the present invention for solving the above-described problems includes: a cell assembly including a plurality of battery cells according to an embodiment of the present invention; And a cooling plate interposed between opposite surfaces of adjacent battery cells. Includes.
Effects of the Invention
[21]
According to an aspect of the present invention, it is possible to increase the energy density of the battery module by manufacturing the battery module by packing the battery cells of the hexagonal column shape.
[22]
According to another aspect of the present invention, in manufacturing a hexagonal columnar electrode assembly applied for manufacturing a hexagonal columnar battery cell, it is possible to prevent a phenomenon in which the electrode active material is damaged and/or removed at the corners of the hexagonal column. do.
Brief description of the drawing
[23]
The following drawings attached to the present specification illustrate preferred embodiments of the present invention, and serve to further understand the technical idea of ​​the present invention together with the detailed description of the present invention, which will be described later. It is limited to and should not be interpreted.
[24]
1 is a plan view showing a battery module according to an embodiment of the present invention.
[25]
2 is a diagram illustrating a battery cell according to an embodiment of the present invention.
[26]
3 is a diagram illustrating an electrode assembly applied to a battery cell according to an embodiment of the present invention.
[27]
4 is a plan view illustrating the electrode assembly shown in FIG. 3.
[28]
5 is an enlarged view showing area E of FIG. 4.
[29]
6 is a diagram illustrating a manufacturing process of a battery cell according to an embodiment of the present invention.
[30]
7 is a view showing an unfolded state of a first electrode constituting an electrode assembly applied to the present invention.
[31]
8 is a view showing an unfolded state of a second electrode constituting an electrode assembly applied to the present invention.
[32]
9 is a diagram showing a step of winding up a layered product including a separation membrane, a first electrode, and a second electrode.
Mode for carrying out the invention
[33]
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as being limited to their usual or dictionary meanings, and the inventors appropriately explain the concept of terms in order to explain their own invention in the best way. Based on the principle that it can be defined, it should be interpreted as a meaning and concept consistent with the technical idea of ​​the present invention. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are only some of the most preferred embodiments of the present invention, and do not represent all the technical spirit of the present invention. It should be understood that there may be equivalents and variations.
[34]
First, a battery module and a battery cell 100 according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.
[35]
1 is a plan view showing a battery module according to an embodiment of the present invention, and FIG. 2 is a view showing a battery cell according to an embodiment of the present invention.
[36]
1 and 2, a battery module according to an exemplary embodiment of the present invention includes a plurality of battery cells 100 and at least one cooling plate 200.
[37]
The battery cell 100 has an approximately hexagonal column shape, and accordingly, the shape viewed from the top has an approximately regular hexagonal shape.
[38]
As described above, the battery cell 100 according to an embodiment of the present invention has a hexagonal column shape, thereby eliminating empty spaces formed between adjacent battery cells 100 when packing a plurality of battery cells 100 Can be minimized.
[39]
That is, each of the plurality of battery cells 100 constituting the battery module has six side surfaces, and when viewed from one battery cell 100, all of these six side surfaces face another battery cell 100 adjacent to each other. Packing is possible so as to do. Accordingly, when manufacturing a battery module using a battery cell having a hexagonal column shape, such as the battery cell 100 according to the present invention, it may be very advantageous in terms of energy density.
[40]
The cooling plate 200 is interposed between opposite surfaces of the battery cells 100 adjacent to each other, and may be made of a metal material to efficiently transfer heat. The cooling plate 200 may extend from one side of the battery module toward the other side, and may have a shape bent so that the planar shape corresponds to the shape of the battery cell 100 having a substantially regular hexagon.
[41]
That is, the cooling plate 200 is in contact with the side surface of the battery cell 100 and face-to-face, but has a shape bent at a position corresponding to the edge of the side surface of the battery cell 100, whereby the cooling plate 200 The contact area between the and the battery cell 100 can be maximized.
[42]
Next, referring to FIG. 3 along with FIG. 2, a schematic structure of a battery cell 100 according to an embodiment of the present invention will be described.
[43]
3 is a diagram illustrating an electrode assembly applied to a battery cell according to an embodiment of the present invention.
[44]
Referring to FIG. 3 along with FIG. 2, the battery cell 100 includes an electrode assembly 10 and a cell case 20 accommodating the electrode assembly 10.
[45]
As described above, since the battery cell 100 according to the present invention has an external shape of an approximately hexagonal column, the cell case 20 also has an external shape of an approximately hexagonal column shape to form such an external shape, and the electrode assembly 10 It has an empty space inside for accommodation. In addition, the electrode assembly 10 has a size corresponding to the size of the cell case 20, and the shape is also a substantially hexagonal column shape like the cell case 20.
[46]
As such, the battery cell 100 according to an embodiment of the present invention does not simply have a hexagonal column shape, but the electrode assembly 10 accommodated in the cell case 20 is also a hexagonal columnar shape. Has. As such, since the electrode assembly 10 has a hexagonal column shape, the volume of the electrode assembly 10 accommodated in the cell case 20 can be maximized, and accordingly, the energy density of the battery cell 100 can be maximized. You will be able to.
[47]
The electrode assembly 10 has a hollow structure including a hole H having a substantially hexagonal column shape penetrating from an upper surface to a lower surface thereof in the center. This hollow structure is formed by winding a stacked body including the first electrode 12 and the second electrode 13 stacked with the separator 11 interposed therebetween in a hexagonal column shape.
[48]
Meanwhile, the cell case 20 may be made of a metal material to maintain its appearance and secure rigidity, and in this case, the electrode 12 and 13 and the cell case 20 are in contact with each other at the outermost side of the electrode assembly 10. The separator 11 may be additionally wound to prevent the occurrence of a short circuit.
[49]
In the present invention, the first electrode 12 may be an anode, and the second electrode 13 may be a cathode. Conversely, the first electrode 12 is a cathode, and the second electrode 13 is an anode. May be.
[50]
Next, a specific structure of the electrode assembly 10 applied to the battery cell 100 according to an embodiment of the present invention and a method of manufacturing the same will be described with reference to FIGS. 4 and 5.
[51]
4 is a plan view illustrating the electrode assembly illustrated in FIG. 3, and FIG. 5 is an enlarged view illustrating region E of FIG. 4.
[52]
4 and 5, the electrode assembly 10 includes a first electrode 12, a second electrode 13, and a separator interposed between the first electrode 12 and the second electrode 13. It includes (11). In addition, as described above, the electrode assembly 10 may further include an additional separator 11 wound around the outermost portion thereof.
[53]
The electrode assembly 10 has an approximate cube shape when viewed from the top, based on a plan view, and such a cube shape has a stack formed by stacking the electrodes 12 and 13 and the separator 11 in the longitudinal direction. Accordingly, it is obtained by bending at predetermined intervals. That is, the electrode assembly 10 has a shape in which the laminate is bent at an angle of approximately 60 degrees toward the center C of the winding at predetermined intervals along the length direction thereof.
[54]
The first electrode 12 is a first electrode active material block 12b formed of a first electrode current collector 12a and a first electrode active material applied on at least one surface of the first electrode current collector 12a Includes. The first electrode active material block 12b is discontinuously coated at a predetermined interval along the length direction of the first electrode current collector 12a. Accordingly, a first uncoated region F1 to which the first electrode active material is not applied is formed between the adjacent first electrode active material blocks 12b.
[55]
This first uncoated region F1 corresponds to a region where bending is performed when the laminate is wound. That is, the first uncoated region F1 corresponds to a corner portion of the hexagonal column in the electrode assembly 10 having a hexagonal column shape.
[56]
Similarly, the second electrode 13 is a second electrode active material block formed of a second electrode active material applied on at least one surface of the second electrode current collector 13a and the second electrode current collector 13a ( 13b). The second electrode active material block 13b is discontinuously coated at a predetermined interval along the length direction of the second electrode current collector 13a. Accordingly, a second uncoated region F2 to which the second electrode active material is not applied is formed between the second electrode active material blocks 13b adjacent to each other.
[57]
This second uncoated region F2 corresponds to a region where bending is performed when the laminate is wound. That is, the second uncoated region F2 corresponds to a corner portion of the hexagonal column in the electrode assembly 10 having a hexagonal column shape.
[58]
As such, the electrode assembly 10 has a hexagonal column shape by having the uncoated regions F1 and F2 of the first electrode 12 and the second electrode 13 constituting the stacked body bent. , By preventing bending of the electrode active material blocks 12b and 13b, damage and dropping of the electrode active material may be prevented.
[59]
In the case of winding a laminate in which the first electrode/separator/second electrode is sequentially stacked in order to form the electrode assembly in a hexagonal column shape, bending occurs in the case of winding the stack by bending toward the center of the winding at predetermined interval When the electrode active material is present in the electrode active material, damage such as cracking may occur or at least a portion of the electrode active material may be removed.
[60]
However, as in the present invention, the electrode active material is not continuously applied on the electrode current collector, but is applied discontinuously so that the uncoated region is formed at predetermined intervals, and the uncoated region is applied so that the uncoated region becomes the corner of a hexagonal column. When the laminate is bent, such a problem can be prevented from occurring.
[61]
Meanwhile, the first electrode current collector 12a may be a positive electrode current collector and the second electrode current collector 13a may be a negative electrode current collector. Conversely, the first electrode current collector 12a is a negative electrode current collector and a second electrode The current collector 13a may be a positive current collector.
[62]
Similarly, the first electrode active material block 12b is a positive electrode active material block and the second electrode active material block 13b may be a negative active material block. Conversely, the first electrode active material block 12b is a negative active material block and a second electrode The active material block 13b may be a positive active material block.
[63]
Next, a method of manufacturing the battery cell 10 according to an embodiment of the present invention will be described with reference to FIGS. 6 to 9.
[64]
6 is a view showing a manufacturing process of the battery cell 10 according to an embodiment of the present invention. 7 is a view showing an unfolded state of a first electrode constituting an electrode assembly applied to the present invention, and FIG. 8 is a view showing an unfolded state of a second electrode constituting an electrode assembly applied to the present invention, 9 is a view showing a step of winding up a layered product including a separator, a first electrode, and a second electrode.
[65]
First, referring to FIG. 6, a method of manufacturing a battery cell according to an embodiment of the present invention includes: providing a first electrode 12; Providing a second electrode 13; Forming a laminate comprising a first electrode 12, a second electrode 13, and a separator 11 interposed therebetween; Winding up the laminate; And a casing step of accommodating the electrode assembly 10 in the case 20. Includes.
[66]
Referring to FIG. 7, in the step of preparing the first electrode, the first electrode active material is discontinuously coated on one or both surfaces of the first electrode current collector 12a, thereby forming a plurality of first electrode active material blocks. This is the step of forming (12b).
[67]
The plurality of first electrode active material blocks 12b may be sequentially grouped from one side in the length direction of the first electrode current collector 12a (a point where winding starts) toward the other side. In this case, the first electrode active material blocks 12b belonging to the same group are formed to have the same length. In addition, the length of the first electrode active material block 12b belonging to the group located farther from the starting point of winding is formed to have a longer length.
[68]
For example, when the first electrode active material block 12b is grouped into N groups, the second group G2 is less than the length A1 of the first electrode active material block 12b belonging to the first group G1. The length A2 of the first electrode active material block 12b belonging to it is formed to be longer, and the length AN of the first electrode active material block 12b belonging to the N-th group GN is formed to be the longest.
[69]
This is, in the electrode assembly 10, six first electrode active material blocks 12b forming a first group form an innermost hexagonal column, and six first electrode active material blocks forming a second group ( This is because the 12b) forms another hexagonal column surrounding the innermost hexagonal column, and the six first electrode active material blocks 12b forming the Nth group form the outermost hexagonal column.
[70]
Meanwhile, the distances D1, D2, and DN between the adjacent first electrode active material blocks 12b may be uniformly formed within the same group, and when different groups are compared, the first electrode active material blocks 12b The distance can be formed differently. That is, the wider the width of the uncoated area F1 may be formed in the group located farther from the point where the winding starts. For example, the first electrode active material block belonging to the second group G2 than the width D1 of the uncoated region F1 formed between the first electrode active material blocks 12b belonging to the first group G1 The width D2 of the uncoated region F1 formed between the 12b may be wider, and the uncoated region formed between the first electrode active material blocks 12b belonging to the Nth group GN The width DN of the region F1 may be the widest.
[71]
Referring to FIG. 8, in the step of preparing the second electrode, a second electrode active material is discontinuously coated on one or both surfaces of the second electrode current collector 13a, thereby forming a plurality of second electrode active material blocks. This is the step of forming (13b).
[72]
The plurality of second electrode active material blocks 13b may be sequentially grouped from one side in the length direction of the second electrode current collector 13a (the point where winding starts) toward the other side. In this case, the second electrode active material blocks 13b belonging to the same group are formed to have the same length. In addition, the length of the second electrode active material block 13b belonging to the group located farther from the starting point of winding is formed to have a longer length.
[73]
For example, when the second electrode active material block 13b is grouped into N groups, the second group (G The length (B2) of the second electrode active material block (13b) belonging to '2) is formed longer, and the length (BN) of the second electrode active material block (13b) belonging to the N-th group (G'N) is the longest. Is formed.
[74]
This is, in the electrode assembly 10, six second electrode active material blocks 13b forming a first group form an innermost hexagonal column, and six second electrode active material blocks forming a second group ( This is because the 13b) forms another hexagonal column surrounding the innermost hexagonal column, and the six second electrode active material blocks 13b forming the Nth group form the outermost hexagonal column.
[75]
Meanwhile, the distances D1, D2, and DN between the adjacent second electrode active material blocks 13b may be formed uniformly within the same group, and when comparing different groups, the second electrode active material blocks 13b The distance can be formed differently. That is, the wider the width of the uncoated area F2 may be formed in the group located farther from the point where the winding starts. For example, a second group (G'2) belonging to the second group (G'2) than the width (D1) of the uncoated region (F2) formed between the second electrode active material blocks (13b) belonging to the first group (G'1). The width D2 of the uncoated area F2 formed between the 2 electrode active material blocks 13b may be wider, and the second electrode active material blocks 13b belonging to the Nth group G'N The width DN of the uncoated area F2 formed therebetween may be the widest.
[76]
In the forming of the laminate, the first electrode 12 / the separator 11 / the second electrode 13 are sequentially stacked to form a separator 11 between the first electrode 12 and the second electrode 13. This is a step of forming a laminate in the form of interposing ).
[77]
The step of forming the laminate may further include disposing an additional separator 11 on the outer surface of the first electrode 12 and/or the outer surface of the second electrode 13. That is, in the stacked body prepared through the step of forming the stacked body, the separator 11 / the first electrode 12 / the separator 11 / the second electrode 13 / the separator 11 are sequentially stacked or The first electrode 12 / separator 11 / second electrode 13 / separator 11 are sequentially stacked or the separator 11 / first electrode 12 / separator 11 / second electrode (13) may have a sequentially stacked form.
[78]
Referring to FIG. 9, the step of winding the stacked body is a step of winding the stacked body in the direction of an arrow so that the first electrode 12 forms the innermost layer. Unlike shown in FIG. 9, if the separation membrane 11 is disposed on the outermost side of the stack, the step of winding the stack may include winding the stack in the direction of the arrow so that the separation membrane 11 forms the innermost layer. It corresponds to the stage.
[79]
In the winding step of the laminate, the laminate is wound in the direction of the arrow shown in FIG. 9, and the electrode current collectors 12a and 13a are bent in the uncoated regions F1 and F2 shown in FIGS. 7 and 8 This is a step of winding the electrode assembly 10 (refer to FIG. 3) to have a substantially hexagonal column shape.
[80]
The casing step is a step of accommodating the electrode assembly 10 (see Fig. 3) having a substantially hexagonal column shape in the cell case 20 (see Fig. 2) having a substantially hexagonal column shape through a winding step.
[81]
Meanwhile, between the winding step and the casing step, a step of winding the separator 11 on the outer surface of the electrode assembly 10 may be further included. That is, the layered body may or may not have the separation membrane 11 disposed on the outermost surface, as described above, but when the separation membrane 11 is not disposed on the outermost surface of the stacked body, When the electrode assembly 10 is completed by winding the sieve, the second electrode 13 is positioned on the outermost side thereof.
[82]
When the second electrode 13 is positioned at the outermost part of the electrode assembly 10 as described above, the second electrode 13 and the inner surface of the cell case 20 may contact each other, and thus, there is a risk of a short circuit. have. Therefore, in order to prevent the occurrence of such a short circuit, it is necessary to further include a step of winding the separator 11 on the outer surface of the electrode assembly 10.
[83]
As described above, in the battery cell 100 according to the embodiment of the present invention, both the electrode assembly 10 and the cell case 20 have a substantially hexagonal column shape (more specifically, the shape of the cross section). It has the shape of a hexagonal column forming an approximately regular hexagon), whereby energy density can be maximized in the case of making a battery module by packing a plurality of battery cells 100. In addition, the battery cell 100 according to an embodiment of the present invention has electrode active materials 12b and 13b in the corner regions of the hexagonal columns by forming uncoated regions F1 and F2 at each position corresponding to the corner of the hexagonal column. ) Can be prevented from being damaged or dropped out.
[84]
In the above, although the present invention has been described by a limited embodiment and drawings, the present invention is not limited thereto, and the technical idea of ​​the present invention and the following will be described by those of ordinary skill in the art to which the present invention pertains. It goes without saying that various modifications and variations are possible within the scope of the claims.
Claims
[Claim 1]
An electrode assembly having a hollow structure in which a hexagonal columnar hole is formed in the center, and having a hexagonal columnar shape; And a cell case accommodating the electrode assembly and having a hexagonal column shape. Battery cell comprising a.
[Claim 2]
The apparatus of claim 1, wherein the electrode assembly comprises: a first electrode including a first electrode current collector and a first electrode active material block discontinuously coated on the first electrode current collector at a predetermined interval; A second electrode including a second electrode current collector and a second electrode active material block discontinuously coated on the second electrode current collector at a predetermined interval; And a separator interposed between the first electrode and the second electrode. Battery cell comprising a.
[Claim 3]
The method of claim 2, wherein the first electrode is bent in a first uncoated region formed between adjacent first electrode active material blocks, and the second electrode is formed between adjacent second electrode active material blocks. 2 Battery cell characterized in that it is bent in the uncoated area.
[Claim 4]
The battery cell of claim 3, wherein the first electrode active material block and the second electrode active material block have a longer length as they are located farther from the center of the cross-section of the electrode assembly.
[Claim 5]
The battery cell of claim 2, wherein a separator is interposed between an outermost surface of the electrode assembly and an inner surface of the cell case.
[Claim 6]
Providing a first electrode by discontinuously forming a first electrode active material block on at least one surface of the first electrode current collector at a predetermined interval; Forming a second electrode active material block discontinuously with a predetermined interval on at least one surface of the second electrode current collector to provide a second electrode; Forming a laminate comprising a first electrode, a second electrode, and a separator stacked such that a separator is interposed between the first electrode and the second electrode; Winding the stacked body so that the outer shape of the electrode assembly becomes a hexagonal column shape; And accommodating the electrode assembly on which winding is completed in a case. Battery cell manufacturing method comprising a.
[Claim 7]
The method of claim 6, wherein when the first electrode active material is sequentially grouped by six from the point where the winding starts, the lengths of the first electrode active material blocks belonging to the same group are the same and farther from the point where the winding starts. A method of manufacturing a battery cell, characterized in that the longer the length of the first electrode active material block belonging to the positioned group is formed.
[Claim 8]
The method of claim 7, wherein when the six second electrode active material blocks are sequentially grouped from the point where the winding starts, the lengths of the second electrode active material blocks belonging to the same group are the same, and the point where the winding starts. The battery cell manufacturing method, characterized in that the length of the second electrode active material block belonging to the group located further away from the block is formed to be longer.
[Claim 9]
The method of claim 6, wherein the winding of the stack comprises a first uncoated region formed between discontinuously formed first electrode active material blocks and a second uncoated region formed between the second electrode active material blocks. Battery cell manufacturing method, characterized in that the step of bending the stacked body.
[Claim 10]
A cell assembly comprising a plurality of battery cells according to any one of claims 1 to 5; And a cooling plate interposed between opposite surfaces of adjacent battery cells. Battery module comprising a.