Negative electrode, electrode assembly and method for manufacturing the same, battery cell, battery pack, device including the same, and measuring method

Abstract

The present invention provides a negative electrode, an electrode assembly and a manufacturing method thereof, a battery cell, a battery pack, a device including the same, and a measurement method. An electrode assembly and a manufacturing method thereof are disclosed. The electrode assembly includes a negative electrode sheet and a negative electrode. When forming an electrode assembly including grooving, cutting, and laminating of a single electrode, it has improved lamination characteristics of the electrode based on shoulders, where the shoulders are thicker and more solid than conventional electrode joints and are applied with an active material without reflecting light.

Description

Technical Field

[0001] The present invention relates to an electrode assembly including a negative electrode plate and a negative electrode having an improved lamination characteristic of an electrode, and a method for manufacturing the same, and more particularly to such an electrode assembly and a method for manufacturing the same, the electrode assembly including a negative electrode sheet and a negative electrode, having an improved lamination characteristic of the electrode based on a shoulder when forming an electrode assembly including grooving, cutting, and laminating of a single electrode, wherein the shoulder is thicker and more solid than a conventional electrode joint and is applied with an active material without reflecting light. Background Art

[0002] Recently, rechargeable secondary batteries have been widely used as an energy source for wireless mobile devices. In addition, secondary batteries have also attracted considerable attention as an energy source for electric vehicles and hybrid vehicles, and the development of secondary batteries is to solve problems such as air pollution caused by existing gasoline and diesel vehicles using fossil fuels. Therefore, due to the advantages of secondary batteries, various applications using secondary batteries are also increasing, and it is expected that secondary batteries will be applied to more uses and products in the future than now.

[0003] Based on the configuration of the electrode and the electrolyte, secondary batteries can be classified into lithium-ion batteries, lithium-ion polymer batteries, or lithium polymer batteries. Among them, the application of lithium-ion polymer batteries is increasing because the possibility of electrolyte leakage of lithium-ion polymer batteries is small and they are easy to manufacture. Generally, based on the shape of the battery case, secondary batteries are classified into cylindrical batteries having an electrode assembly installed in a cylindrical metal can, prismatic batteries having an electrode assembly installed in a prismatic metal can, and pouch batteries having an electrode assembly installed in a pouch-shaped case made of an aluminum laminate.

[0004] The electrode assembly installed in the battery case is a power generation element configured to have a structure including a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode and capable of charging and discharging. The electrode assembly is classified into: a jelly roll type electrode assembly, which is configured to have a structure in which a long strip type positive electrode and a long strip type negative electrode applied with an active material are wound in a state where a separator is interposed between the positive electrode and the negative electrode; or a laminated type electrode assembly, which is configured to have a structure in which a plurality of positive electrodes having a predetermined size and a plurality of negative electrodes having a predetermined size are sequentially laminated in a state where separators are respectively disposed between the positive electrode and the negative electrode.

[0005] Figure 1 is a schematic view of a manufacturing process of a conventional laminated electrode assembly.

[0006] Reference Figure 1, the stacked electrode assembly 10 is configured to have a structure such that the electrode assembly 10 includes a positive electrode plate 1, a negative electrode plate 2, and a second separator laminated between unit cells, and the unit cells have a separator 5 interposed between the positive electrode plate 1 and the negative electrode plate 2. A positive electrode terminal 3 and a negative electrode terminal 4 protruding from the positive electrode plate 1 and the negative electrode plate 2 are electrically attached to one side of the positive electrode plate 1 and the negative electrode plate 2. The above structure is also applicable to a jelly roll type electrode assembly.

[0007] In the structure of a conventional stacked electrode assembly, it is difficult to increase the capacity of a secondary battery. Therefore, there is a drawback that the demand for a high-capacity secondary battery cannot be met due to the miniaturization or thinning of the device.

[0008] In addition, when an error occurs in the manufacturing process (for example, a slitting process of cutting out a plurality of electrodes from an electrode sheet coated with an electrode mixture layer on one or both sides of the electrode plate or an alignment process of the electrodes), not only the capacity of the battery is reduced, but also the life of the battery is shortened.

[0009] In particular, as Figure 1 shown, where a conventional negative electrode terminal is folded, since the electrode terminal formed by slitting is only formed of a metal foil, it may not be suitable as a reference line for subsequent processes due to problems such as folding and light reflection.

[0010] In a general slitting process or lamination process, cutting or lamination is performed based on the electrode terminal. However, since the electrode terminal is only made of a metal foil, the electrode terminal is thinner than the mixture layer coated with the electrode active material, resulting in low process efficiency and a high defect rate.

[0011] In addition, Figure 10 is a cross-sectional view of an electrode assembly according to the prior art. Referring to Figure 10 , the electrode assembly constituting the pouch-type battery cell has a structure in which a separator 5 is interposed between a positive electrode 10 and a negative electrode 20, and a positive electrode mixture layer 11 and a negative electrode mixture layer 21 including an electrode active material are coated on one or both surfaces of a negative electrode sheet 200 and a positive electrode sheet 400 as current collectors.

[0012] Figure 11 is a detailed view of an electrode current collector in which an electrode sheet coated with an electrode active material on both sides is laminated with a separator. Referring to Figure 11 , the positive electrode mixture layer 11 includes an electrode active material applied between positive electrode sheets as current collectors, and the positive electrode mixture layer 11 is configured to have: a positive electrode flat portion 111 in which the electrode active material is applied in a uniform thickness manner; and a positive electrode inclined portion 112 in which the electrode active material is applied at a certain inclination. Referring to Figure 11, the negative electrode mixture layer 21 includes an electrode active material applied between negative electrode sheets serving as current collectors, and the negative electrode mixture layer 21 is configured to have: a negative electrode flat portion 211 where the electrode active material is applied in a uniform thickness manner; and a negative electrode inclined portion 212 where the electrode active material is applied at a certain inclination.

[0013] When the thickness t of the negative electrode mixture layer N is formed to be thicker than the thickness t of the positive electrode mixture layer P the capacity characteristics of the battery are maintained, and the safety of the battery is also improved.

[0014] The positive electrode and the negative electrode can be current collectors with a positive electrode active material or a negative electrode active material coated on a sheet in the form of a metal foil. The positive electrode and the negative electrode can have a sliding portion where, due to physical and chemical properties such as viscosity and composition of the active material, a difference in the coating thickness appears at opposite ends of the coating portion.

[0015] The angle β of the negative electrode inclined portion is smaller than the angle α of the positive electrode inclined portion. The reason why the inclination of the negative electrode inclined portion is gentler than that of the positive electrode inclined portion is that the viscosity of the active material of the positive electrode is higher than that of the negative electrode. Therefore, the inclination of the negative electrode inclined portion is relatively gentle. The length L of the negative electrode inclined portion in the negative electrode direction N is greater than the length L of the positive electrode inclined portion in the positive electrode direction P .

[0016] Due to the formation characteristics of the mixture layer as described above, there is a negative - positive capacity reversal portion 500 where the negative - positive capacity ratio (N / P ratio) is reversed. The existence of such a negative - positive capacity reversal portion may result in a lack of space inside the negative electrode 20 for the insertion of lithium ions detached from the positive electrode 10 during repeated charge - discharge processes. Since lithium ions precipitate on the surface of the negative electrode in the form of metallic lithium, or metal - component impurities added during the battery manufacturing process are recrystallized, safety problems may occur due to internal short - circuits caused by the metal - component impurities passing through the separator and contacting the positive electrode.

[0017] Figure 12 Shows the experimental results of measuring the negative - positive capacity ratio at each position where the negative - positive capacity reversal portion appears. This experiment was conducted using a thin - film thickness measuring device (rotary caliper, MAYSUN of Japan, RC - 1W - 1000). In the experiment, after inserting the drive electrode into the roller and completing calibration after cleaning, the electrode whose thin - film thickness is to be measured is inserted between the electrode - inserting rollers, and the electrode is moved to measure the thickness. The positive - electrode active - material coating portion including the positive - electrode flat portion and the positive - electrode inclined portion and the negative - electrode active - material coating portion including the negative - electrode flat portion and the negative - electrode inclined portion can be observed. The negative - positive capacity reversal portion 500 can be observed in a predetermined portion of the positive - electrode inclined portion and the negative - electrode inclined portion.

[0018] In order to suppress the negative-positive capacity reversal part as much as possible, the following method is adopted: at the position where the negative electrode and the positive electrode face each other and a separator is interposed therebetween, the cross-sectional capacity of the negative electrode is greater than that of the positive electrode. However, regarding the improvement of energy density, research on the control of the cross-sectional capacity applied or coated on the electrode edge has been carried out, but there are difficulties in the control process.

[0019] Therefore, it is necessary to conduct technological development on an electrode assembly including a negative electrode sheet and a negative electrode and its manufacturing method, wherein, based on the shoulder, the lamination performance of the electrode is improved (the shoulder is firm because it is thicker than the conventional electrode joint and does not reflect light due to the application of the active material), so as to change the cutting standard of the electrode during the lamination process, improve the alignment accuracy during the lamination process, and improve the effect of ACOH (negative-positive electrode suspension) gap detection.

[0020] (Prior art documents)

[0021] (Patent Document 1) Japanese Patent Application Publication No. 2009-123752

[0022] (Patent Document 2) Korean Patent Application Publication No. 2015-0033933

[0023] (Patent Document 3) Japanese Patent Application Publication No. 2010-086813 Summary of the Invention

[0024] Technical Problem

[0025] The present invention is made to solve the above problems and other technical problems that have not been solved.

[0026] In particular, an object of the present invention is to provide an electrode assembly including a negative electrode sheet and a negative electrode and its manufacturing method, wherein, based on the shoulder, the lamination performance of the electrode is improved (the shoulder is firm because it is thicker than the conventional electrode joint and does not reflect light due to the application of the active material), so as to change the cutting standard of the electrode in the lamination process, improve the alignment accuracy during the lamination process, and improve the effect of positive-negative electrode gap detection.

[0027] Technical Solution

[0028] According to one aspect of the present invention, the above and other objects of the present invention can be achieved by providing a method for manufacturing a negative electrode that ensures an ACOH (Anode-Cathode Overhang) gap, the method comprising: a first step of manufacturing a negative electrode roll having an active material coating portion and a non-coating portion formed in a longitudinal direction (Y-axis direction); a second step of grooving at a predetermined interval (A) in a full width direction (X-axis direction) of the negative electrode roll to form a negative electrode joint including the active material coating portion and the non-coating portion and a shoulder portion including the active material coating portion; and a third step of cutting at a predetermined interval (B) in the full width direction (X-axis direction) based on the shoulder portion.

[0029] In addition, a center line of the shoulder portion in the full width direction may be formed at a level aligned with a center line of a positive electrode joint of a positive electrode in the full width direction.

[0030] In addition, a height of the shoulder portion based on an outer peripheral end of the negative electrode in the longitudinal direction may be equal to or lower than a height of the active material coating portion of the negative electrode joint.

[0031] In addition, a full width (W6) of the shoulder portion may include a full width of the positive electrode joint and an ACOH gap on both sides of the positive electrode joint.

[0032] In addition, a full length (L61) of the shoulder portion may be from 0.1 mm to 3 mm or more starting from one outer end of the negative electrode.

[0033] In addition, an R value of the shoulder portion may be from 0.1R to 3R.

[0034] According to another aspect of the present invention, a negative electrode may be provided that includes, at a predetermined interval (A): a negative electrode joint including an active material coating portion and a non-coating portion; and a shoulder portion including the active material coating portion, wherein when laminated with a positive electrode, the shoulder portion is formed at a position facing the positive electrode joint.

[0035] In addition, a full width (W6) of the shoulder portion may include a full width of the positive electrode joint and an ACOH gap, and a full length (L61) of the shoulder portion may include a length of the active material coating portion of the positive electrode joint and an ACOH gap.

[0036] In addition, a negative electrode-positive electrode capacity reversal portion may not be provided, in which a cross-sectional capacity of a negative electrode inclined portion of the active material coating portion of the shoulder portion is higher than a cross-sectional capacity of a positive electrode inclined portion of the active material coating portion of the positive electrode joint.

[0037] In addition, a height (H) from a negative electrode end (215) to a negative electrode joint neck (214) NTN2) from the starting point of the shoulder formed at the negative extreme to the height (H of the active material coating portion NS ) of the negative electrode height ratio (H NTN2 / H NS ) is from 5.0 to 1.

[0038] According to another aspect of the present invention, an electrode assembly can be provided, which includes: a positive electrode, where a positive electrode terminal protrudes from one outer end, and a positive electrode mixture layer including a positive electrode active material is applied to the lower part of the positive electrode terminal and the current collector; a negative electrode, where a negative electrode terminal protrudes from one outer end, and a negative electrode mixture layer including a negative electrode active material is applied to the lower part of the negative electrode terminal and the current collector; and a separator interposed between the positive electrode and the negative electrode. Wherein, the negative electrode includes, at a predetermined interval (A) in the full-width direction (X-axis direction): a negative electrode terminal including an active material coating portion and a non-coating portion; and a shoulder including the active material coating portion, and when laminated with the positive electrode, the shoulder is formed at a position facing the positive electrode terminal.

[0039] In addition, the negative electrode terminal and the shoulder of the negative electrode can be formed together at one end in the entire length direction (Y-axis direction) of the negative electrode, or formed at opposite ends in the entire length direction (Y-axis direction) of the negative electrode.

[0040] According to another aspect of the present invention, a method for manufacturing an electrode assembly for ensuring an ACOH (negative electrode and positive electrode suspended) gap can be provided, the method including: visually sensing the shoulder of the negative electrode; and performing lamination such that the positive electrode terminal of the positive electrode is positioned based on the full width or the entire length of the shoulder, wherein the ACOH gap between the laminated positive electrode terminal and the shoulder is measured to prevent misalignment of the lamination of the electrode assembly. The negative electrode is formed at a predetermined interval (A) in the full-width direction (X-axis direction) with: a negative electrode terminal including an active material coating portion and a non-coating portion; and a shoulder including only the active material coating portion, and the full width of the shoulder includes the full width of the positive electrode terminal and the ACOH gaps on both sides of the positive electrode terminal.

[0041] The method can further include: performing lamination such that the positive electrode terminal of the positive electrode is positioned based on the full width or the entire length of the shoulder; and visually sensing the shoulder of the negative electrode laminated below the positive electrode terminal of the positive electrode, wherein the interval between one end of the laminated positive electrode and one end of the laminated negative electrode in the entire length direction (Y-axis direction) is measured, and the ACOH gap between the laminated positive electrode terminal and the shoulder is measured to define the gap between the positive electrode and the negative electrode.

[0042] In addition, the electrode assembly can have a laminated type, a zigzag type, a jelly roll type, or a laminated / folded type structure.

[0043] In addition, the electrode assembly may include a single electrode plate and unit battery cells, and the unit battery cells include double battery cells having electrode plates with the same polarity on two outer surfaces or full battery cells having electrode plates with different polarities on two outer surfaces.

[0044] In addition, the positive electrode terminal and the negative electrode terminal may be formed in the same direction or opposite directions based on the full length direction (Y-axis direction).

[0045] In addition, the present invention may provide a battery cell in which the electrode assembly manufactured by the above method is accommodated in a battery case together with an electrolytic solution.

[0046] In addition, the present invention may provide a battery pack including one or more battery cells.

[0047] In addition, the present invention may provide a device including the battery pack.

[0048] The present invention may provide a method for measuring the thickness of an electrode mixture layer, the method including:

[0049] a first step of preparing an electrode sheet including an electrode mixture layer;

[0050] a second step of inserting the electrode sheet into at least a pair of electrode insertion rollers;

[0051] a third step of moving the electrode sheet in one direction while a pair of electrode insertion rollers rotate; and

[0052] a fourth step of obtaining measured values including a thickness ratio of a negative electrode, a thickness ratio of a positive electrode, and a negative electrode-positive electrode capacity ratio by measuring the thickness of the electrode mixture layer formed on the electrode sheet while the electrode sheet moves,

[0053] wherein a negative electrode sheet of the electrode sheet is formed at a predetermined interval (A) with: a negative electrode terminal including an active material coated portion and a non-coated portion; and a shoulder including the active material coated portion.

[0054] The device may be selected from a computer, a mobile phone, a wearable electronic device, a power tool, an electric vehicle (EV), a hybrid vehicle, an electric two-wheeler, an electric golf cart, or an energy storage system.

[0055] The structure and manufacturing method of the device are well known in the technical field to which the present invention pertains, and a detailed description thereof is omitted herein.

[0056] Advantageous Effects

[0057] As described above, the negative electrode having improved lamination characteristics of an electrode according to the present invention, an electrode assembly including the negative electrode, and a method of manufacturing the same have an effect of reducing error occurrence by changing the cutting of the electrode based on the shoulder portion of the negative electrode in a lamination process.

[0058] In addition, when laminating to form an electrode assembly, there is an effect of reducing errors generated due to misalignment during lamination at the corner portions of the electrodes.

[0059] In addition, when laminating to form an electrode assembly, there is an effect of improving the fairness and accuracy of ACOH gap measurement by measuring the shoulder portion.

[0060] In addition, there is an effect of increasing the capacity of the electrode assembly by effectively applying an electrode mixture layer including an electrode active material over a larger area without increasing the volume of the electrode plate.

[0061] In addition, when forming an electrode assembly, there is an effect of preventing the occurrence of a negative-positive capacity reversal portion caused by the thinning of the electrode mixture layer including the electrode active material toward both ends of the positive electrode and the negative electrode.

[0062] Therefore, there is an effect of improving the stability and capacity of the secondary battery and extending its lifespan. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 is a schematic diagram showing the folding phenomenon of a conventional laminated unidirectional electrode assembly and its electrode joints.

[0064] Figure 2 is a schematic diagram showing a comparison between a bidirectional electrode plate according to an embodiment of the present invention and a conventional bidirectional electrode plate.

[0065] Figure 3 is a schematic diagram showing a comparison between a unidirectional electrode plate according to an embodiment of the present invention and a conventional unidirectional electrode plate.

[0066] Figure 4 is a schematic diagram showing a bidirectional electrode plate according to an embodiment of the present invention, the bidirectional electrode plate including a negative electrode having a shoulder portion.

[0067] Figure 5 is a schematic diagram showing a step of grooving a negative electrode based on the shoulder portion by means of a press having a mold formed thereon according to an embodiment of the present invention.

[0068] Figure 6 is a cross-sectional view showing a step of grooving a negative electrode based on the shoulder portion by means of a press according to an embodiment of the present invention.

[0069] Figure 7It is a schematic diagram showing that, compared with the problems in laminating traditional unidirectional electrodes, the accuracy is improved by laminating unidirectional electrodes based on shoulders according to an embodiment of the present invention.

[0070] Figure 8 It is a schematic diagram showing that, according to an embodiment of the present invention, compared with the problems in laminating traditional unidirectional electrodes, the measurement accuracy of the gap between the positive electrode and the negative electrode is improved.

[0071] Figure 9 It is a schematic diagram of a bidirectional electrode assembly formed with shoulders according to an embodiment of the present invention.

[0072] Figure 10 It is a cross-sectional view of a traditional electrode assembly.

[0073] Figure 11 It is an enlarged cross-sectional view showing the existence of the negative-positive capacity reversal part of a traditional electrode assembly.

[0074] Figure 12 It shows the experimental results confirming the existence of the negative-positive capacity reversal part according to the negative-positive capacity ratio of a traditional electrode assembly.

[0075] Figure 13 It is a comparison between the plan view of a traditional electrode assembly with a negative-positive capacity reversal part and the plan view of an electrode assembly formed with shoulders in which the negative-positive capacity reversal part is removed in a unidirectional electrode assembly according to an embodiment of the present invention.

[0076] (Explanation of reference numerals)

[0077] 1: Positive electrode plate

[0078] 10: Positive electrode

[0079] 11: Positive electrode mixture layer

[0080] 111: Positive electrode flat part

[0081] 112: Positive electrode inclined part

[0082] 113: Positive electrode non-coated part

[0083] 114: Positive electrode joint neck

[0084] 2: Negative electrode plate

[0085] 20: Negative electrode

[0086] 21: Negative electrode mixture layer

[0087] 211: Negative electrode flat part

[0088] 212: Negative electrode inclined part

[0089] 213: Negative electrode non-coated part

[0090] 214: Negative electrode connection neck

[0091] 3: Positive electrode connection

[0092] 31: Lower part of the positive electrode connection

[0093] 4: Negative electrode connection

[0094] 41: Lower part of the negative electrode connection

[0095] 5: Diaphragm

[0096] 6: Shoulder

[0097] 100: Press

[0098] 110: Lower press

[0099] 200: Negative electrode sheet

[0100] 210: Mold

[0101] 220: Mold part of the negative electrode connection

[0102] 230: Mold part of the shoulder

[0103] 300: Feeder

[0104] 400: Positive electrode plate

[0105] 500: Negative - positive capacity reversal part Detailed implementation manners

[0106] In the following, according to the embodiments of the present invention, the present invention will be described in detail with reference to the accompanying drawings. However, this is for the convenience of understanding the present invention, and the scope of the present invention is not limited by this description.

[0107] ACOH (negative - positive electrode suspended) refers to the gap between the negative electrode and the positive electrode required for the battery stability of the negative electrode and the positive electrode when constructing a secondary battery.

[0108] The electrode connection neck refers to the coated area of the electrode connection formed on the electrode sheet by grooving. The electrode connection neck may include an inclined part and a flat part coated with the active material.

[0109] The electrode sheet is a unit electrode that is grooved and cut in the electrode roll.

[0110] The electrode assembly refers to a unit battery cell in which the negative electrode, the diaphragm, and the positive electrode are laminated.

[0111] In the present invention, the bipolar electrode assembly refers to the electrode assembly applied to medium - sized or large - sized batteries such as electric vehicles, and the unipolar electrode assembly refers to the electrode assembly applied to small - sized batteries such as mobile devices.

[0112] The electrode assembly of the present invention may have a stacked type, a zigzag type (refer to KR 10-1634772B1), or a laminated / folded type structure.

[0113] An electrode roll is a unit obtained by generally slitting a sheet having a plurality of active material coating portions and a plurality of non-coating portions and rolling up an electrode sheet having a single active material coating portion and a non-coating portion.

[0114] The shoulder of the present invention is configured to be formed on a part of the negative electrode when forming the electrode assembly, and a part of the positive electrode joint forming the positive electrode overlaps with the said part of the negative electrode.

[0115] When forming the negative electrode sheet, the shoulder is formed to include the active material coating portion of the negative electrode roll.

[0116] When the shoulder overlaps with the positive electrode joint by lamination, it has ACOH in the full width direction and the full length direction.

[0117] The numerical values or reference values proposed in the present invention are design values, and process errors are naturally expected to exist when applying actual processes.

[0118] Figure 1 It is a schematic diagram showing the folding phenomenon of a conventional laminated unidirectional electrode assembly and its electrode joint.

[0119] Figure 2 It is a schematic diagram showing a comparison between a bidirectional electrode plate according to an embodiment of the present invention and a conventional bidirectional electrode plate.

[0120] Figure 3 It is a schematic diagram showing a comparison between a unidirectional electrode plate according to an embodiment of the present invention and a conventional unidirectional electrode plate.

[0121] Reference Figures 1 to 3 , the electrode assembly according to the present invention is configured to have a structure in which a separator 5 is interposed between a positive electrode plate 1 and a negative electrode plate 2, and the electrode assembly includes a positive electrode plate 1, a negative electrode plate 2, and a separator 5.

[0122] The configurations of the conventional electrode plates 1 and 2 are arranged on the Figure 2 and Figure 3 left side, and the configurations of the electrode plates according to the embodiments of the present invention are arranged on the Figure 2 and Figure 3 right side. The electrode plate of the present invention has a square shape in a plan view, and Figure 4 is a partial enlarged view of the electrode plate of the present invention.

[0123] In the positive electrode plate 1, the positive electrode terminal 3 protrudes from one outer peripheral end in the longitudinal direction (Y-axis direction), and a positive electrode mixture layer 11 including a positive electrode active material is applied to the lower part 31 of the positive electrode terminal protruding from the positive electrode plate 1 and the positive electrode current collector.

[0124] In the negative electrode plate 2, the negative electrode terminal 4 protrudes from one outer peripheral end in the longitudinal direction (Y-axis direction), and a negative electrode mixture layer 21 including a negative electrode active material is applied to the lower part 41 of the negative electrode terminal protruding from the negative electrode plate 2 and the negative electrode current collector.

[0125] The area of the negative electrode plate 2 is relatively larger than the area of the positive electrode plate 1, and the positive electrode terminal 3 and the negative electrode terminal 4 are formed in the same direction (Y-axis direction) so as to have protruding ends of the same length.

[0126] The length L1 of the negative electrode plate is the sum of the length L2 of the positive electrode plate, the length L11 of the upper end of the negative electrode plate, and the length L12 of the lower end of the negative electrode plate, where the length L11 of the upper end of the negative electrode plate and the length L12 of the lower end of the negative electrode plate extend longer than the outer peripheral end of the positive electrode plate.

[0127] The negative electrode plate and the positive electrode plate are configured to have a structure in which the negative electrode plate and the positive electrode plate are laminated in a state where the negative electrode plate and the positive electrode plate are aligned based on the center line C-C' so that the centers of the negative electrode plate and the positive electrode plate are aligned with each other.

[0128] The length L11 of the upper end of the negative electrode plate can be extended by 0.1 mm or more than the upper end of the positive electrode plate. If it is less than the above value, a short circuit may occur due to process errors during the formation of the electrode assembly by the lamination and stacking processes.

[0129] The outer peripheral end of each side of the square shape of the negative electrode plate extends 0.1 mm longer than the outer peripheral end of each side of the positive electrode plate, and this range includes the process error range of the manufacturing process.

[0130] This means that the values of L11, L12, W11, and W12 are 0.1 mm or more. General international standards require values of 0.1 mm or more. If it is less than the above value, a short circuit may occur due to process errors during the formation of the electrode assembly by the lamination and stacking processes.

[0131] The length UNIDI-L11 extending from the upper end (the direction of forming the electrode terminal) of the conventional unidirectional negative electrode plate and being longer than the upper end of the conventional unidirectional positive electrode plate is greater than the length UNIDI-L12 extending from the lower end (the direction of not forming the electrode terminal) of the conventional unidirectional negative electrode plate and being longer than the lower end of the conventional unidirectional positive electrode plate. That is, UNIDI-L11 > UNIDI-L12.

[0132] When comparing the length of the unidirectional positive electrode plate according to the present invention with the length of the conventional unidirectional positive electrode plate, the length of the unidirectional positive electrode plate according to the present invention is longer than that of the conventional unidirectional positive electrode plate, thereby creating a difference in length, and an effect of increasing the capacity due to this difference can be exhibited.

[0133] The length BIDI-L12, which extends from the lower end of the conventional bidirectional negative electrode plate (the direction where the negative electrode connection is not formed) and is longer than the upper end of the conventional bidirectional positive electrode plate, is equal to or less than the length BIDI-L11, which extends from the lower end of the conventional bidirectional negative electrode plate and is longer than the lower end of the conventional bidirectional positive electrode plate. Obviously, the difference in the length values is caused by process errors that occur during the actual process application of the design values during slitting, grooving, and cutting.

[0134] When comparing the length L22 of the bidirectional positive electrode plate according to the present invention with the length L2 of the conventional bidirectional positive electrode plate, the length L22 of the bidirectional positive electrode plate according to the present invention is longer than the length L2 of the conventional bidirectional positive electrode plate, thereby creating a difference of L22 - L2, and an effect of increasing the capacity due to this difference can be exhibited.

[0135] The length L12 by which the lower end of the bidirectional negative electrode plate according to the present invention extends longer than the lower end of the bidirectional positive electrode plate according to the present invention is shorter than the extension length BIDI-L12 of the corresponding conventional bidirectional negative electrode plate. The length L11 by which it extends longer than the upper end of the bidirectional positive electrode plate according to the present invention is equal to the extension length BIDI-L11 of the corresponding conventional bidirectional negative electrode plate.

[0136] Figure 4 is a schematic diagram showing a bidirectional electrode plate according to an embodiment of the present invention, the bidirectional electrode plate including a negative electrode, and the negative electrode including a shoulder.

[0137] The shoulder 6 has a flat rectangular shape, and the protruding length L6 of the shoulder 6 is longer than the lower part 31 of the positive electrode connection to which the positive electrode mixture layer 11 is applied.

[0138] The shoulder 6 is formed on the negative electrode plate facing the positive electrode connection, and a negative electrode mixture layer is applied to a part of the negative electrode plate corresponding to the lower part 31 of the positive electrode connection to which the positive electrode mixture layer is applied.

[0139] The area of the shoulder 6 is relatively larger than the area of the lower part 31 of the positive electrode connection to which the positive electrode mixture layer is applied.

[0140] The outer peripheral end of the shoulder 6 may have the overall length L61 of the shoulder and the overall width W6 of the shoulder. The overall length L61 of the shoulder and the overall width W6 of the shoulder extend more than 0.1 mm from the outer peripheral end of the positive electrode connection to which the positive electrode mixture layer is applied in the overall width direction and the overall length direction. If the above numerical range is not satisfied, problems such as short circuits may occur when forming the electrode assembly through the lamination process.

[0141] The overall length L61 of the shoulder portion 6 extends to be relatively longer than the region of the lower portion of the positive electrode terminal, and the overall width W6 of the shoulder portion 6 is formed to be relatively larger than the width W31 of the lower portion of the positive electrode terminal.

[0142] The region of the negative electrode mixture layer to which the negative electrode plate is applied, including the lower portion 41 of the negative electrode terminal and the shoulder portion 6, is larger than the region of the positive electrode mixture layer to which the positive electrode plate is applied.

[0143] In a general grooving process or lamination process, cutting or lamination is performed based on the electrode terminal. However, since the electrode terminal is made only of a metal foil, the electrode terminal is thinner than the mixture layer on which the electrode active material is applied, resulting in low process efficiency and a high defect rate.

[0144] Therefore, a method for manufacturing an electrode and an electrode assembly based on a shoulder (since the shoulder is solid because it is thicker than a conventional electrode terminal and does not reflect light because the active material is applied) is provided to change the cutting standard of the electrode in the lamination process, improve the alignment accuracy during the lamination process, and improve the efficiency of ACOH (negative electrode positive electrode overhang) gap detection.

[0145] Figure 5 It is a schematic diagram showing the step of grooving the negative electrode based on the shoulder by means of a press on which a mold is formed according to an embodiment of the present invention.

[0146] Generally, a roll pressing process is performed such that heating rolls are placed on the upper surface and the lower surface of an electrode processed body on which an electrode paste including an electrode active material is applied, and the heating rolls press the electrode paste in the direction of the electrode processed body. In the roll pressing process, the solvent remaining in the electrode paste is evaporated, and the electrode paste is compressed and solidified on the electrode to form an electrode mixture layer with an improved energy density. Thereafter, a processing process for processing the external shape of the set electrode is performed.

[0147] In the process of slitting the roll-pressed electrode processed body, a cutter is used to slit an electrode current collector made of a metal sheet elongated in one direction and coated with an electrode mixture, and the electrode current collector is divided into a plurality of electrode strips. In particular, the Y direction is the overall length direction of the metal foil, and the X direction is the longitudinal direction of the metal foil, and this X direction is the overall width direction.

[0148] As a method for manufacturing a negative electrode that ensures an ACOH (negative electrode positive electrode suspended) gap, a method including the following steps can be provided: a first step of manufacturing a negative electrode roll having an active material coating portion and a non-coating portion formed in the longitudinal direction (Y-axis direction); a second step of grooving, at a predetermined interval (A) in the entire width direction (X-axis direction) of the negative electrode sheet, a negative electrode joint including the active material coating portion and the non-coating portion and a shoulder portion including only the active material coating portion; and a third step of cutting at a predetermined interval (B) in the entire width direction (X-axis direction) based on the shoulder portion.

[0149] There may be such a negative electrode plate in which the negative electrode joint protrudes from one outer peripheral end, and a negative electrode mixture layer including a negative electrode active material is applied to the lower portion of the negative electrode joint and the current collector.

[0150] The negative electrode joint protrudes from one outer peripheral end in the longitudinal direction (Y-axis direction) in the negative electrode plate, and a negative electrode mixture layer including a negative electrode active material is applied to the lower portion of the negative electrode joint protruding from the negative electrode plate and the negative electrode current collector.

[0151] The predetermined interval A may be the entire width of a single negative electrode.

[0152] The entire width of the negative electrode may be 1 to 500 mm, preferably 10 to 200 mm. At this time, obviously, the predetermined interval A can be changed according to the design capacity of the battery.

[0153] The predetermined interval B may be the distance from one end of the shoulder portion to the boundary line cut in the entire width direction to form a single negative electrode.

[0154] The predetermined interval B may be 1 to 300 mm, preferably 5 to 100 mm. At this time, obviously, the predetermined interval B can be changed according to the design capacity of the battery.

[0155] Figure 6 It is a cross-sectional view showing the step of grooving the negative electrode based on the shoulder portion by a press according to an embodiment of the present invention.

[0156] Reference Figure 5 and Figure 6 , a grooving process is performed on the electrode workpiece manufactured by the slitting process, in which the shape of the electrode joint is formed using a mold or laser. Specifically, the electrode workpiece is cut using a mold to process the shape of the electrode joint and the shape of the coating portion coated with the electrode mixture.

[0157] In addition, the shape of the shoulder portion including the negative electrode mixture layer of the present invention can be processed.

[0158] This grooving process with a continuous feeding method is a method of simultaneously transporting and pressing electrode sheets by a press. It is characterized in that the pressed electrode sheets are continuously fed without stopping. Describe this continuous feeding method, which includes a press 100 for pressing the negative electrode sheet 200 into a predetermined shape and a feeder 300 for feeding the negative electrode sheet to the press, and the press also serves as a feeder. That is, the press presses the negative electrode sheet while transporting half of the transport length, and the standby feeder continuously transports the negative electrode sheet while the feeder transports the remaining transport length. The negative electrode sheet is continuously transported at a predetermined speed.

[0159] Figure 7 is a schematic diagram showing that, compared with the problem of laminating traditional unidirectional electrodes, the accuracy is improved by laminating unidirectional electrodes based on shoulders according to an embodiment of the present invention.

[0160] In order to improve the accuracy of laminating electrodes to form Figure 7 the traditional unidirectional electrode assembly on the left, X, Y, and Θ are adjusted by scanning the edges of the electrodes. However, as Figure 7 shown, as the lamination progresses, X is distorted into X' and X", Y is distorted into Y' and Y", and the values also change. By scanning the laminated part of the shoulders and the positive electrode joints of the present invention, X, Y, and Θ are adjusted. As a result, the lamination accuracy is improved.

[0161] Figure 8 is a schematic diagram showing that, compared with the problems in laminating traditional unidirectional electrodes, the measurement accuracy of the gap between the positive electrode and the negative electrode is improved according to an embodiment of the present invention.

[0162] When laminating to form Figure 8 the traditional unidirectional electrode assembly on the left, the accuracy of the lamination process is measured by measuring the gap between the positive electrode and the negative electrode. At this time, the gap between the positive electrode and the negative electrode must be measured by measuring at least two edges of the laminated electrodes.

[0163] In the case of the present invention, the gap between the positive electrode and the negative electrode is measured by only scanning the part where the shoulders and the positive electrode joints are formed, thereby enabling the improvement of the accuracy of the lamination process.

[0164] The center line of the shoulder in the full-width direction can be aligned with the center line of the positive electrode joint of the positive electrode in the full-width direction.

[0165] Obviously, the alignment of the center line of the shoulder in the full-width direction with the center line of the positive electrode joint of the positive electrode in the full-width direction is a design standard and can correspond to the central value of the process change in the actual mass production process. Therefore, the formation of such a negative electrode plate can be fully expected, that is, the negative electrode plate is formed with shoulders whose alignment partially deviates from the center line.

[0166] In the positive electrode plate, the positive electrode terminal projects from one outer peripheral end in the longitudinal direction (Y-axis direction), and a positive electrode mixture layer including a positive electrode active material is coated on the lower part of the positive electrode terminal protruding from the positive electrode plate and the positive electrode current collector.

[0167] The height of the outer peripheral end of the shoulder based on the negative electrode plate in the longitudinal direction can be equal to or lower than the height of the active material coating portion of the negative electrode terminal.

[0168] The height of the outer peripheral end of the shoulder based on the negative electrode plate in the longitudinal direction can be higher than the height of the active material coating portion of the positive electrode terminal.

[0169] The overall width of the shoulder can include the overall width of the positive electrode terminal and the ACOH gaps on both sides of the positive electrode terminal.

[0170] If the above values cannot be ensured, improvement in mass productivity and processability of the product cannot be expected. In addition, when welding the electrode terminals, the defective rate may increase.

[0171] The overall length L61 of the shoulder can be from 0.1 mm to 3 mm starting from one outer end of the negative electrode for reference when stacking the electrode assembly. When exceeding the lower limit, safety problems may occur. The overall length of the shoulder should be greater than or equal to the lower limit to ensure the ACOH gap and for reference when stacking the electrodes. If exceeding the upper limit, the coating portion may exceed the separator, and unnecessary electrode loss may occur.

[0172] The R value of the shoulder can be from 0.1R to 3R for connecting between the electrodes. When the R value of the shoulder exceeds this range, the electrode quality may deteriorate.

[0173] A negative electrode can be provided, which is formed with a negative electrode terminal including an active material coating portion and a non-coating portion and a shoulder including only an active material coating portion at a predetermined interval A in the overall width direction (X-axis direction), wherein the center line of the shoulder in the overall width direction is aligned with the center line of the positive electrode terminal in the overall width direction, and the overall width of the shoulder includes the overall width of the positive electrode terminal and the ACOH gaps on both sides of the positive electrode terminal.

[0174] The negative electrode terminal and the shoulder can be formed together at one end in the longitudinal direction (Y-axis direction) of the negative electrode, or can be formed at opposite ends in the longitudinal direction (Y-axis direction) of the negative electrode.

[0175] There can be a method of manufacturing an electrode assembly, the method including: visually sensing a shoulder of a negative electrode; and performing lamination such that a positive electrode terminal of a positive electrode plate is positioned based on the full width or full length of the shoulder, wherein an ACOH gap between the laminated positive electrode terminal and the shoulder is measured to prevent misalignment of the lamination of the electrode assembly. The negative electrode is formed with, at a predetermined interval (A) in the full width direction (X-axis direction): a negative electrode terminal including an active material coated portion and an uncoated portion; and a shoulder including only the active material coated portion, and the full width of the shoulder includes the full width of the positive electrode terminal and the ACOH gaps on both sides of the positive electrode terminal.

[0176] There can be a method of manufacturing an electrode assembly, the method including: performing lamination such that a positive electrode terminal of a positive electrode is positioned based on the full width or full length of a shoulder; and visually sensing the shoulder of the negative electrode laminated below the positive electrode terminal of the positive electrode, wherein an interval between one end of the laminated positive electrode and one end of the laminated negative electrode in the full length direction (Y-axis direction) is measured, and an ACOH gap between the laminated positive electrode terminal and the shoulder is measured to define a gap between the positive electrode and the negative electrode.

[0177] In a method of manufacturing an electrode assembly, the electrode assembly can have a laminated type or a laminated / folded type structure.

[0178] In a method of manufacturing an electrode assembly, the electrode assembly can include a single electrode plate and a unit cell, and the unit cell includes a dual cell having electrode plates with the same polarity on two outer surfaces or a full cell having electrode plates with different polarities on two outer surfaces.

[0179] In a method of manufacturing an electrode assembly, the positive electrode terminal and the negative electrode terminal can be formed in the same direction or in opposite directions based on the full length direction (Y-axis direction).

[0180] A battery cell including an electrode assembly manufactured by a method for manufacturing an electrode assembly can be provided, and the electrode assembly is embedded in a battery case together with an electrolytic solution.

[0181] A battery pack including one or more battery cells can be provided.

[0182] A device including the battery pack can be provided.

[0183] Furthermore, the sectional capacity of the negative electrode inclined portion of the active material coated portion of the shoulder can be higher than the sectional capacity of the positive electrode inclined portion of the active material coated portion of the positive electrode terminal.

[0184] Furthermore, the height H from the neck 214 of the negative electrode terminal as a starting point to the active material coated portion of the negative electrode terminal NTN2 and the height H from the starting point of forming the shoulder to the active material coated portion NS of the negative electrode height ratio H NTN2 / HNS is from 5.0 to 1.

[0185] That is, the negative electrode sheet including the shoulder can be grooved by moving upward or downward in the longitudinal direction at the input position of the notch formed in the conventional negative electrode sheet of the negative electrode sheet. The grooving condition can be carried out at 0.1 to 1.5 mm, which is higher than the existing condition.

[0186] Through these improvements, the stability evaluation, process capability and ACOH gap of the electrode assembly can be improved.

[0187] When the negative electrode with a shoulder formed and the positive electrode are stacked, the shoulder can contact the positive electrode joint neck, and the shoulder can overlap with the coating part, which is the active material coating part of the positive electrode.

[0188] The shoulder formed on the negative electrode should be formed on the coating part.

[0189] In addition, the shoulder formed on the negative electrode should be larger than the positive electrode joint neck.

[0190] Therefore, the height of the shoulder cannot be greater than the lower limit of the negative electrode joint neck. This is because to prevent short circuits caused by contact between the foils of the metal sheets that make up the electrode, and there is a high risk of fire due to short circuits caused by contact between the non-coated parts of the positive electrode active material and the negative electrode active material.

[0191] Figure 13 is Figure 11 The plan views before and after applying the present invention. Figure 13 The upper side of is before applying the present invention Figure 11 The plan view of the negative electrode and the positive electrode of, it can be seen that there is a height H from the negative electrode joint neck 214 to the active material coating part NTN1 and the negative-positive capacity reversal part 500.

[0192] In the Figure 13 lower side after applying the present invention, it can be seen that a height H from the starting point of forming the shoulder 6 on the negative electrode to the active material coating part is formed in the negative electrode flat part to the negative electrode inclined part NS .

[0193] Before applying the present invention, the height H from the negative electrode joint neck 214 to the active material coating part NTN1 is less than that after applying the present invention, the height H from the negative electrode joint neck 214 to the active material coating part NTN2 . Therefore, the formation of the negative-positive capacity reversal part can be eliminated.

[0194] The negative electrode after applying the present invention can move more in the longitudinal direction (Y-axis direction) than the negative electrode before applying the present invention to form a shoulder.

[0195] When the negative electrode exceeds this range, a negative electrode - positive electrode capacity reversal part may occur, leading to battery safety problems.

[0196] In addition, a method for measuring the thickness of the electrode mixture layer is provided, which includes:

[0197] The first step, preparing an electrode sheet including the electrode mixture layer;

[0198] The second step, inserting the electrode sheet into at least a pair of electrode insertion rollers;

[0199] The third step, when the paired electrode insertion rollers rotate, moving the electrode sheet in one direction; and

[0200] The fourth step, while the electrode sheet is moving, obtaining measurement values including the thickness ratio of the negative electrode, the thickness ratio of the positive electrode, and the negative electrode - positive electrode capacity ratio by measuring the thickness of the electrode mixture layer formed on the electrode sheet,

[0201] wherein, the negative electrode sheet of the electrode sheet is formed with a negative electrode joint at a predetermined interval (A), which includes an active material coating part and a non - coating part; and a shoulder, which includes the active material coating part.

[0202] Those skilled in the art of the technical field to which the present invention pertains will understand that various applications and modifications based on the above description are possible without departing from the scope of the present invention.

[0203] Industrial Applicability

[0204] As described above, the negative electrode having improved lamination characteristics of the electrode according to the present invention, the electrode assembly including the negative electrode, and its manufacturing method have the effect of reducing error occurrence by changing the cutting of the electrode based on the shoulder of the negative electrode in the lamination process.

[0205] In addition, when laminating to form an electrode assembly, it has the effect of reducing errors caused by misalignment during lamination at the corners of the electrode.

[0206] In addition, when laminating to form an electrode assembly, it has the effect of improving the fairness and accuracy of ACOH gap measurement by measuring the shoulder.

[0207] In addition, it provides the effect of increasing the capacity of the electrode assembly by effectively applying the electrode mixture layer including the electrode active material over a larger area without increasing the volume of the electrode plate.

[0208] In addition, when forming the electrode assembly, it has the effect of preventing the occurrence of a negative-positive capacity reversal part, which is caused by the thinning of the electrode mixture layer including the electrode active material toward both ends of the positive electrode and the negative electrode.

[0209] Therefore, it has the effects of improving the stability and capacity of the secondary battery and extending its lifespan.

[0210] This application claims the priority of Korean Patent Application No. 10-2020-0102132 filed on August 14, 2020, and Korean Patent Application No. 10-2020-0175841 filed on December 15, 2020, the disclosures of which are hereby incorporated herein by reference in their entirety.

Claims

1. A method for manufacturing a negative electrode while ensuring a gap between the negative electrode and the positive electrode in the suspension space, the method comprises: a first step of manufacturing a negative electrode roll having an active material coated portion and an uncoated portion formed in the overall length direction; a second step of grooving to form a negative electrode joint including the active material coated portion and the uncoated portion and a shoulder including the active material coated portion at a predetermined interval A in the overall width direction of the negative electrode roll; and a third step of cutting at a predetermined interval B in the overall width direction based on the shoulder.

2. The method according to claim 1, wherein, the center line of the shoulder in the overall width direction is formed at a level aligned with the center line of the positive electrode joint of the positive electrode in the overall width direction.

3. The method according to claim 1, wherein, the height of the shoulder based on the outer peripheral edge of the negative electrode in the overall length direction is equal to or lower than the height of the active material coated portion of the negative electrode joint.

4. The method according to claim 2, wherein, the overall width (W6) of the shoulder includes the overall width of the positive electrode joint and the negative electrode - positive electrode suspension space gaps on both sides of the positive electrode joint.

5. The method according to claim 2, wherein, the overall length (L61) of the shoulder is 0.1 mm to 3 mm starting from one outer end of the negative electrode.

6. The method according to claim 2, wherein, the R value of the shoulder is 0.1R to 3R.

7. A negative electrode, the negative electrode at a predetermined interval A comprises: a negative electrode joint including an active material coated portion and an uncoated portion; and a shoulder including the active material coated portion, wherein the shoulder is formed at a position facing the positive electrode joint when laminated with the positive electrode, and the center line of the shoulder in the overall width direction is formed at a position aligned with the center line of the positive electrode joint of the positive electrode in the overall width direction.

8. The negative electrode according to claim 7, wherein, the negative electrode does not have a negative - positive electrode capacity reversal portion in which the cross - sectional capacity of the negative inclined portion of the active material coated portion of the shoulder is higher than the cross - sectional capacity of the positive inclined portion of the active material coated portion of the positive electrode joint.

9. The negative electrode according to claim 7, wherein, The height (H NTN2 ) from the negative electrode terminal (215) to the neck portion (214) of the negative electrode connection and the height (H NS ) from the starting point of forming the shoulder at the negative electrode terminal to the active material coating portion, the negative electrode height ratio (H NTN2 / H NS ) is 5.0 to 1.

10. An electrode assembly, the electrode assembly comprises: a positive electrode in which a positive electrode joint extends from one outer end, and a positive electrode mixture layer including a positive electrode active material is applied on the lower portion of the positive electrode joint and the current collector; a negative electrode in which a negative electrode joint protrudes from one outer end, and a negative electrode mixture layer including a negative electrode active material is applied on the lower portion of the negative electrode joint and the current collector; and a separator interposed between the positive electrode and the negative electrode, wherein the negative electrode is formed at a predetermined interval A with: a negative electrode joint including an active material coated portion and an uncoated portion; and a shoulder including the active material coated portion, and Wherein, the shoulder is formed at a position facing the positive electrode terminal when stacked with the positive electrode, and the center line of the shoulder in the overall width direction is formed at a position aligned with the center line of the positive electrode terminal of the positive electrode in the overall width direction.

11. The electrode assembly according to claim 10, Wherein, the negative electrode terminal of the negative electrode and the shoulder are formed together at one end in the overall length direction of the negative electrode, or formed at opposite ends in the overall length direction of the negative electrode.

12. A method for manufacturing an electrode assembly, the method comprises: visually sensing the shoulder of the negative electrode; and performing stacking such that the positive electrode terminal of the positive electrode is positioned based on the overall width or overall length of the shoulder, wherein, measuring the negative-positive overhang gap between the stacked positive electrode terminal and the shoulder to prevent misalignment of the stacking of the electrode assembly, the negative electrode is formed with, at a predetermined interval A in the overall width direction: a negative electrode terminal including an active material coated portion and a non-coated portion; and a shoulder including only an active material coated portion, and the overall width of the shoulder includes the overall width of the positive electrode terminal and the negative-positive overhang gaps on both sides of the positive electrode terminal.

13. The method according to claim 12, the method further comprises: performing stacking such that the positive electrode terminal of the positive electrode is positioned based on the overall width or overall length of the shoulder; and visually sensing the shoulder of the negative electrode stacked below the positive electrode terminal of the positive electrode, wherein, measuring the interval between one end of the stacked positive electrode and one end of the stacked negative electrode in the overall length direction, and measuring the negative-positive overhang gap between the stacked positive electrode terminal and the shoulder to define the gap between the positive electrode and the negative electrode.

14. The method according to claim 12, Wherein, the electrode assembly has a stacked type, zigzag type, jelly roll type or stacked / folded type structure.

15. The method according to claim 12, Wherein, the electrode assembly includes a single electrode plate and a unit cell, and the unit cell includes a dual cell having electrode plates with the same polarity on two outer surfaces or a full cell having electrode plates with different polarities on two outer surfaces.

16. The method according to claim 12, Wherein, the positive electrode terminal and the negative electrode terminal are formed in the same direction or opposite directions based on the overall length direction.

17. A battery cell, the battery cell includes an electrode assembly manufactured by the method according to any one of claims 12 to 16, and the electrode assembly is accommodated in a battery case together with an electrolyte.

18. A battery pack, the battery pack includes one or more battery cells according to claim 17.

19. An apparatus including the battery pack according to claim 18.

20. A method for measuring the thickness of an electrode mixture layer, the method comprises: a first step of preparing an electrode sheet including an electrode mixture layer; a second step of inserting the electrode sheet into at least a pair of electrode insertion rollers; In the third step, while the paired electrodes are inserted and rotated, move the electrode sheet in one direction; and In the fourth step, while the electrode sheet is being moved, obtain measurement values including a thickness ratio of the negative electrode, a thickness ratio of the positive electrode, and a negative electrode - positive electrode capacity ratio by measuring the thickness of the electrode mixture layer formed on the electrode sheet. Wherein, the negative electrode sheet of the electrode sheet is formed at a predetermined interval A with: a negative electrode terminal including an active material coating portion and a non - coating portion; and a shoulder including the active material coating portion.

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