Electrode assembly structure, cylindrical battery including the same, battery pack, and automobile

Abstract

The present invention discloses an electrode assembly structure that facilitates the impregnation of an electrolytic solution and the discharge of gas, and reduces the risk of fire due to short circuit. An electrode assembly structure according to an aspect of the present invention includes a first electrode assembly wound around a winding shaft, and a second electrode assembly wound around the winding shaft, adjacent to the first electrode assembly, and located further outward in the radial direction.

Description

Technical Field

[0001] The present invention relates to an electrode assembly structure, a cylindrical battery including the same, a battery pack, and a vehicle. More specifically, the present invention relates to an electrode assembly structure that facilitates impregnation of an electrolytic solution and discharge of gas and reduces the risk of fire due to a short circuit, a cylindrical battery including the same, and a battery pack.

[0002] This application claims priority based on Korean Patent Application No. 10-2022-0089220 filed on July 19, 2022, and all of the contents disclosed in the specification and drawings of the application are incorporated into this application.

Background Art

[0003] In order to maximize the current collection efficiency in a cylindrical battery, it is possible to apply an electrode assembly in which a positive electrode tab and a negative electrode tab extend vertically along the height direction of the battery can. In a cylindrical battery to which an electrode assembly having such a structure is applied, a current collector plate may be used as an intermediate medium for connecting each of the positive electrode tab and the negative electrode tab to a cell terminal and the battery can, respectively.

[0004] In this case, for example, the positive current collector plate may be coupled to the positive electrode tab while covering one surface of the electrode assembly, and the negative current collector plate may be coupled to the negative electrode tab while covering the other surface of the electrode assembly. Also, the positive current collector plate may be electrically connected to the cell terminal, and the negative current collector plate may be electrically connected to the battery can.

[0005] However, according to a conventional cylindrical battery having such a structure, current concentrates on the strip-shaped electrode tabs that are coupled to the positive electrode non-coated portion and / or the negative electrode non-coated portion, resulting in high resistance, generation of a large amount of heat, and poor current collection efficiency.

[0006] Small cylindrical batteries with form factors of 1865 or 2170 are not regarded as major issues with high resistance and heat generation. However, when increasing the form factor for applying cylindrical batteries to electric vehicles, there may be a problem that the cylindrical battery catches fire while generating a large amount of heat around the electrode tab during the rapid charging process. Also, as the form factor increases, the diameter of the electrode assembly becomes larger. Compared with existing cylindrical batteries with a small form factor, the electrolyte cannot move to the center or outermost part of the electrode assembly by electrolyte injection. As a result, there is a problem of insufficient impregnation.

[0007] In addition, for cylindrical batteries with an increased form factor, if they are exposed to a high-temperature environment for a long time, the separator shrinks and a short circuit occurs between the electrodes, and there is a problem that the risk of fire increases due to the increased form factor.

[0008] In the cylindrical battery having the structure as described above, there has been an increasing desire to develop a cylindrical battery with a novel structure that can solve the above problems.

Summary of the Invention

Problems to be Solved by the Invention

[0009] The present invention has been made in view of the above problems, and its object is to facilitate the impregnation of the electrolyte and the discharge of gas, and to reduce the risk of fire due to short circuit.

[0010] However, the technical problems to be solved by the present invention are not limited to the above-mentioned problems, and other problems not mentioned should be clearly understood by those skilled in the art from the description of the invention described below.

Means for Solving the Problems

[0011] The electrode assembly structure according to an embodiment of the present invention includes a first electrode assembly wound around a winding axis, and a second electrode assembly wound around the winding axis, adjacent to the first electrode assembly, and located further outward in the radial direction defined as the direction away from the winding axis than the first electrode assembly. Each of the first electrode assembly and the second electrode assembly includes a first electrode including a first plain portion not coated with an active material layer along the winding direction, a second electrode including a second plain portion not coated with an active material layer along the winding direction, and a separator interposed between the first electrode and the second electrode. A laminate including these can form a core and an outer peripheral surface by being wound around the winding axis.

[0012] At least a part of the plain portion of the first electrode assembly and at least a part of the plain portion of the second electrode assembly may include a plurality of segmented pieces divided along the winding direction.

[0013] When winding, the first electrode assembly does not form the segmented pieces in a portion corresponding to the portion forming the core. When winding, the second electrode assembly may not form the segmented pieces in a portion corresponding to the portion forming the outer peripheral surface.

[0014] The second electrode assembly is located further outward in the radial direction than the first electrode assembly. The plain portion of the first electrode assembly and the plain portion of the second electrode assembly can be bent in the radial direction or in a direction opposite to the radial direction.

[0015] The plain portion of the first electrode assembly and the plain portion of the second electrode assembly can be bent in opposite directions.

[0016] The plain portion of the first electrode assembly is bent in a direction opposite to the radial direction. The plain portion of the second electrode assembly can be bent in the opposite direction.

[0017] The electrode assembly structure may include a separation member located between the first electrode assembly and the second electrode assembly.

[0018] The separation member may be configured to have a free space formed between the outer peripheral surface of the first electrode assembly and the inner peripheral surface of the second electrode assembly.

[0019] The separation member may have a discontinuous shape along the circumferential direction of the outer peripheral surface of the first electrode assembly.

[0020] The separation member may include a material having electrical insulation properties.

[0021] The separation member may include a heat conductive material.

[0022] The cylindrical battery according to an embodiment of the present invention includes the electrode assembly structure according to the present invention, a battery housing having an opening formed on one side and accommodating the electrode assembly structure through the opening and being electrically connected to the first electrode, a top cap covering the opening, a terminal protruding outside the battery housing through a closing portion located on the opposite side of the opening and being electrically connected to the second electrode, and a first current collector located on one surface of the electrode assembly structure and configured to electrically connect between the electrode assembly structure and the battery housing.

[0023] The first current collector may include a first tab coupling portion that couples to the first plain portion of each of the plurality of electrode assemblies, and a housing coupling portion that couples to the battery housing.

[0024] The battery pack according to the present invention may include the cylindrical battery according to the present invention.

[0025] The automobile according to the present invention may include the battery pack according to the present invention.

Advantages of the Invention

[0026] According to one aspect of the present invention, when the electrode assembly is exposed to high temperature for a long time and the separator shrinks to cause a short circuit between the electrodes, since the electrode assembly structure is composed of a plurality of electrode assemblies, the short-circuit current can be reduced as compared with the case where it is composed of a single electrode assembly. This is because the short-circuit current is not due to a short circuit that can occur in an electrode assembly composed of a single electrode assembly as a whole, but due to short circuits occurring in each of the plurality of electrode assemblies. Therefore, the risk of fire due to a short circuit can be reduced.

[0027] The electrode assembly structure can easily impregnate the electrolyte and discharge gas. This is because the electrolyte and gas can easily move through the space formed between the first electrode assembly and the second electrode assembly. In particular, the movement of the electrode assembly structure in the height direction can be smoothly performed through the space provided in the direction parallel to the winding shaft.

[0028] The electrode assembly structure can be easily produced. In particular, when the form factor increases, there is a high possibility of production defects such as misalignment occurring when winding a laminate including electrodes and separators multiple times to form one electrode assembly. However, when producing and joining a plurality of smaller electrode assemblies, since the number of winding times is reduced, the possibility of production defects can be reduced.

[0029] According to another aspect of the present invention, by forming a segmented piece (segment), the plain part can be easily bent. Further, by joining the current collector to the surface formed by the multiple overlapping of the bent segmented pieces instead of a separate tab, the connection between the electrode assembly structure and the current collector can be easily performed, the area where current can move becomes wider, and the resistance can be reduced.

[0030] According to still another aspect of the present invention, even if an electrolytic solution or gas moves into the space formed between the first electrode assembly and the second electrode assembly, it does not affect the plain portion, so that the possibility of the plain portion or the separator being torn and causing a short circuit between the electrodes can be reduced.

[0031] According to still another aspect of the present invention, it is possible to prevent a clearance from occurring in the space between the first electrode assembly and the second electrode assembly via a separation member. While preventing the clearance, the separation member is configured to include a free space formed between the outer peripheral surface of the first electrode assembly and the inner peripheral surface of the second electrode assembly, so that the electrolytic solution and gas can be easily moved.

Brief Description of the Drawings

[0032]

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Embodiments for Carrying Out the Invention

[0033] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The drawings attached to this specification illustrate preferred embodiments of the present invention and are for the purpose of further understanding the technical idea of the present invention together with the detailed description of the invention to be described later. Therefore, the present invention is not to be construed as being limited only to the matters described in such drawings. The same reference numerals refer to the same components. Also, in the drawings, the thickness, ratio, and dimensions of the components may be exaggerated for an effective explanation of the technical content.

[0034] The terms and words used in this specification and the claims are not to be construed as being limited to their ordinary or dictionary meanings. In accordance with the principle that the inventor can appropriately define the concept of the terms in order to explain the invention in the best way, they are to be construed in meanings and concepts corresponding to the technical idea of the present invention.

[0035] In this specification, terms indicating directions such as up, down, left, right, front, and back are used, but these terms are merely for convenience of explanation and it is self-evident to those skilled in the art of the present invention that they may vary depending on the position of the object and the position of the observer.

[0036] Therefore, it should be understood that the embodiments described in this specification and the configurations shown in the drawings are merely preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention. At the time of this application, there can be various equivalents and modified embodiments that can replace these.

[0037] FIG. 1 is a diagram showing the electrode assembly structure 10 according to the present invention. FIG. 2 is a diagram showing a cross section of the electrode assembly structure 10 according to the present invention. FIG. 3 is a diagram showing the laminate S according to the present invention.

[0038] Referring to FIGS. 1 to 3, the electrode assembly structure 10 according to the present invention may include a first electrode assembly 100 and a second electrode assembly 200.

[0039] The first electrode assembly 100 and the second electrode assembly 200 may be wound around a common winding axis. The first electrode assembly 100 and the second electrode assembly 200 may be adjacent to each other. The second electrode assembly 200 may be adjacent to the first electrode assembly 100 and may be located further outward in the radial direction defined as the direction away from the winding axis than the first electrode assembly 100.

[0040] The first electrode assembly 100 may be located closer to the winding axis than the second electrode assembly 200. The second electrode assembly 200 may be located further outward in the radial direction than the first electrode assembly 100.

[0041] There may be a clearance between the first electrode assembly 100 and the second electrode assembly 200. However, the first electrode assembly 100 and the second electrode assembly 200 may be stuck together without a clearance.

[0042] The outer diameter of the first electrode assembly 100 and the inner diameter of the second electrode assembly 200 may be substantially the same. The outer peripheral surface of the first electrode assembly 100 and the inner peripheral surface of the second electrode assembly 200 may face each other.

[0043] However, the first electrode assembly 100 and the second electrode assembly 200 are included in the electrode assembly structure 10 and show electrode assemblies adjacent to each other, and the electrode assembly structure 10 is not necessarily limited to being composed of only the first electrode assembly 100 and the second electrode assembly 200. That is, the electrode assembly structure 10 may include two or more electrode assemblies.

[0044] The first electrode assembly 100 includes a first electrode 110 including a first plain portion 111 not coated with an active material layer along the winding direction, a second electrode 120 including a second plain portion 121 not coated with an active material layer along the winding direction, and a separator M interposed therebetween. A laminate S can form a core and an outer peripheral surface by being wound around a common winding axis.

[0045] The second electrode assembly 200 includes a first electrode 210 including a first plain portion 211 not coated with an active material layer along the winding direction, a second electrode 220 including a second plain portion 221 not coated with an active material layer along the winding direction, and a separator M interposed therebetween. A laminate S can form a core and an outer peripheral surface by being wound around a common winding axis.

[0046] According to such a configuration of the present invention, for example, when the electrode assembly is exposed to a high temperature for a long time and the separator shrinks to cause a short circuit between the electrodes, the electrode assembly structure 10 is composed of a plurality of electrode assemblies 100 and 200. Therefore, the short-circuit current can be reduced compared to the case where it is composed of a single electrode assembly. This is because the short-circuit current is not a short circuit that can occur in an electrode assembly composed of a single electrode assembly as a whole, but is due to short circuits occurring in each of the plurality of electrode assemblies. Therefore, the risk of fire due to a short circuit can be reduced.

[0047] The electrode assembly structure 10 can facilitate the impregnation of the electrolytic solution and the discharge of gas. This is because the electrolytic solution and gas can easily move through the space formed between the first electrode assembly 100 and the second electrode assembly 200. In particular, the movement of the electrode assembly structure 10 in the height direction can be smoothly performed through the space provided in the direction parallel to the winding axis.

[0048] The electrode assembly structure 10 can be easily produced. In particular, when the form factor increases, there is a high possibility of production defects such as misalignment occurring when winding a laminate including electrodes and separators multiple times to form one electrode assembly. However, when producing and joining a plurality of smaller electrode assemblies, since the number of winding times is reduced, the possibility of production defects can be reduced.

[0049] FIG. 4 is a diagram showing the structures of the electrodes 110 and 120 of the first electrode assembly 100 included in the electrode assembly structure 10 according to the present invention. FIG. 5 is a diagram showing the structures of the electrodes 210 and 220 of the second electrode assembly 200 included in the electrode assembly structure 10 according to the present invention.

[0050] Returning to FIGS. 4 and 5, at least a part of the plain portions 111 and 121 of the first electrode assembly may include a plurality of segmented pieces A divided along the winding direction. At least a part of the plain portions 211 and 221 of the second electrode assembly may include a plurality of segmented pieces A divided along the winding direction.

[0051] The segmented piece A can be notched. The segmented piece A can be trapezoidal. However, the segmented piece A can be deformed into a quadrilateral, a parallelogram, a semi - circle, or a semi - ellipse, etc.

[0052] The height of the segmented piece A of the plain portions 111 and 121 of the first electrode assembly can gradually increase as it progresses from the core side to the outer peripheral side along the winding direction. The plain portions 111 and 121 of the first electrode assembly may not form the segmented piece A in the portion corresponding to the portion forming the core during winding.

[0053] The height of the segmented piece A of the plain portions 211 and 221 of the second electrode assembly can gradually decrease as it progresses from the core side to the outer peripheral side along the winding direction. The plain portions 211 and 221 of the second electrode assembly may not form the segmented piece A in the portion corresponding to the portion forming the outer peripheral surface during winding.

[0054] The segment piece A can be bent in the radial direction or the direction opposite to the radial direction. The segment piece A can be overlapped multiple times by the bending. The first current collector 20 and / or the second current collector 60 described later can be coupled to a region where a plurality of segment pieces A are overlapped multiple times.

[0055] According to such a structure of the present invention, by forming the segment piece A, the plain part can be easily bent. Further, by coupling the current collector to the surface formed by the bent segment pieces A overlapping multiple times instead of using a separate tab, the coupling between the electrode assembly structure 10 and the current collector can be easily performed, the area where current can move becomes wider, and the resistance can be reduced.

[0056] FIG. 6 is a diagram showing the coupling process of the electrode assembly structure 10 according to the present invention. FIG. 7 is a diagram showing the first electrode assembly 100 included in the electrode assembly structure 10 according to the present invention. FIG. 8 is a diagram showing the second electrode assembly 200 included in the electrode assembly structure 10 according to the present invention.

[0057] Referring to FIGS. 6 to 8, the plain parts 111 and 121 of the first electrode assembly can be bent in the radial direction or the direction opposite to the radial direction. The plain parts 211 and 221 of the second electrode assembly can be bent in the radial direction or the direction opposite to the radial direction.

[0058] The plain parts 111 and 121 of the first electrode assembly and the plain parts 211 and 221 of the second electrode assembly can be bent in opposite directions. For example, as shown in FIGS. 6 to 8, the plain parts 111 and 121 of the first electrode assembly are bent in the direction opposite to the radial direction, and the plain parts 211 and 221 of the second electrode assembly can be bent in the radial direction.

[0059] According to such a structure of the present invention, the holes formed in the core of the first electrode assembly 100 are not closed by the bent plain portions 111 and 121. The plain portions 211 and 221 bent on the outer peripheral surface of the second electrode assembly 200 do not protrude. Further, the space formed between the first electrode assembly 100 and the second electrode assembly 200 is not closed by the bent plain portions 111, 121, 211, and 221. This is because the plain portions 111 and 121 of the first electrode assembly are bent in a direction opposite to the radial direction, and the plain portions 211 and 221 of the second electrode assembly are bent in the radial direction. Therefore, even if the electrolyte or gas moves into the space formed between the first electrode assembly 100 and the second electrode assembly 200, it will not affect the plain portions, so the possibility of the plain portions or the separator being torn and causing a short circuit between the electrodes can be reduced.

[0060] FIG. 9 is a diagram showing the electrode assembly structure 10 according to the present invention. FIG. 10 is a diagram showing the bonding process of the separation member 300 included in the electrode assembly structure 10 according to the present invention.

[0061] Referring to FIGS. 9 and 10, the electrode assembly structure 10 may include a separation member 300.

[0062] The separation member 300 may be located between the first electrode assembly 100 and the second electrode assembly 200. The separation member 300 may be configured to have a free space formed between the outer peripheral surface of the first electrode assembly 100 and the inner peripheral surface of the second electrode assembly 200. The separation member 300 may have a discontinuous shape along the circumferential direction of the outer peripheral surface of the first electrode assembly 100. For example, the separation member 300 may include four members arranged radially at intervals of 90° on the outer peripheral surface of the first electrode assembly 100. Each of the four members has a certain width along the outer peripheral surface of the first electrode assembly 100 and a thickness corresponding to the interval between the outer peripheral surface of the first electrode assembly 100 and the inner peripheral surface of the second electrode assembly 200, and may have a shape extending along the height direction of the electrode assembly structure 10.

[0063] The separator member 300 may include a material having electrical insulation properties. The separator member 300 may include a thermally conductive material.

[0064] According to such a structure of the present invention, it is possible to prevent the occurrence of a clearance in the space between the first electrode assembly 100 and the second electrode assembly 200 via the separator member 300. While preventing the clearance, the separator member 300 is configured to have a free space formed between the outer peripheral surface of the first electrode assembly 100 and the inner peripheral surface of the second electrode assembly 200, so that the movement of the electrolytic solution and gas can be facilitated.

[0065] Since the separator member 300 includes a thermally conductive material, when heat is generated from the electrode assembly structure 10 or a fire occurs, heat can be discharged through the separator member.

[0066] FIG. 11 is a view showing a cylindrical battery 5 according to the present invention.

[0067] Referring to FIG. 11, the cylindrical battery 5 according to the present invention may include a battery housing 30, a top cap 40, a terminal 50, and a first current collector 20.

[0068] The battery housing 30 may accommodate the electrode assembly structure 10 through an opening formed on one side. The battery housing 30 is a substantially cylindrical container having an opening formed on one side, and may be made of a conductive metal material. The battery housing 30 may be electrically connected to the first electrodes 110 and 210. The battery housing 30 may be used as one external terminal. The battery housing 30 may also accommodate the electrolyte through the opening. However, the battery housing 30 of the present invention is not limited to such a form.

[0069] The top cap 40 may be configured to cover the opening portion. The top cap 40 may be configured not to have polarity. The top cap 40 may be made of a metallic material to ensure rigidity, but even in such a case, it may not have polarity. The top cap 40 may include an insulating material. However, the present invention is not limited to the top cap 40 not having polarity and may have the same polarity as the battery housing 30.

[0070] The top cap 40 may include a vent portion 41. The vent portion 41 may be configured to be weaker compared to the surrounding area. The vent portion 41 can be broken and gas can be discharged when the pressure inside the battery increases. The vent portion 41 may be formed by performing notching on either one side or both sides of the top cap 40 to partially reduce the thickness of the top cap 40.

[0071] The terminal 50 may protrude outside the battery housing 30 through a closing portion located on the opposite side of the opening portion. The terminal 50 may be electrically connected to the second electrodes 120 and 220. The terminal 50 may penetrate through the substantially central portion of the lower surface of the battery housing 30. The terminal 50 may be electrically connected to the electrode assembly structure 10 by being coupled to a second current collector 60 described later.

[0072] The first current collector 20 may be located on one surface of the electrode assembly structure 10. The first current collector 20 may be electrically connected to the first electrodes 110 and 210. The first current collector 20 may electrically connect between the electrode assembly structure 10 and the battery housing 30.

[0073] The first current collector 20 may include a first tab coupling portion 21 and a housing coupling portion 22. The first tab coupling portion 21 may be coupled to the plain portion 111 of the first electrode assembly and the plain portion 211 of the second electrode assembly. The first tab coupling portion 21 may be located on the separation member 300. For example, the first tab coupling portion 21 may extend from a support portion located on one surface of the first electrode assembly 100 to one surface of the second electrode assembly 200 and be located on the separation member 300. The housing coupling portion 22 may be coupled to the battery housing 30. The housing coupling portion 22 may be coupled to the inner surface of the battery housing 30.

[0074] According to such a structure of the present invention, the first tab coupling portion 21 of the first current collector is located on the separation member 300. As a result, when the first tab coupling portion 21 is coupled to the plain portion 111 of the first electrode assembly and the plain portion 211 of the second electrode assembly, it can be stably supported by the separation member 300.

[0075] Returning to FIG. 11, the cylindrical battery 5 according to the present invention may include a second current collector 60 and / or an insulator 80 and / or a first gasket G1 and / or a second gasket G2.

[0076] The second current collector 60 may be electrically coupled to the second electrodes 120, 220. The second current collector 60 may be electrically coupled to the terminal 50. The second current collector 60 may include a terminal coupling portion 61 that couples to the terminal 50 and a second tab coupling portion 62 that couples to the second electrodes 120, 220.

[0077] The insulator 80 may be located between the electrode assembly structure 10 and the battery housing 30 for insulation between the battery housing 30 and the second electrodes 120, 220. The insulator 80 may be interposed between the closed portion of the battery housing 30 and the second current collector 60. The insulator 80 may include, for example, a resin material having insulating properties. The insulator 80 may be provided with a hole substantially at the center so that the terminal 50 can be electrically connected to the second current collector 60.

[0078] The first gasket G1 can be disposed between the top cap 40 and the battery housing 30. The first gasket G1 prevents the top cap 40 and the battery housing 30 from contacting each other.

[0079] The second gasket G2 can be disposed between the terminal 50 and the battery housing 30. The second gasket G2 prevents the terminal 50 and the battery housing 30 from contacting each other.

[0080] The first gasket G1 and the second gasket G2 can be made of a resin material having insulation and elasticity.

[0081] FIG. 12 is a view showing the battery pack 3 according to the present invention.

[0082] Referring to FIG. 12, the battery pack 3 according to the present invention may include a cylindrical battery 5. In addition to the cylindrical battery 5, the battery pack 3 may further include various other components, such as components of a battery pack known at the time of filing of the present invention, such as a battery management system (BMS), a bus bar, a pack case, a relay, a current sensor, and the like.

[0083] FIG. 13 is a view showing the vehicle 1 according to the present invention.

[0084] Referring to FIG. 13, the vehicle 1 according to the present invention may include a battery pack 3. The vehicle 1 may be a hybrid vehicle or an electric vehicle. In addition to such a battery pack 3, the vehicle 1 according to the present invention may further include various other components included in the vehicle. For example, in addition to the battery pack 3 according to the present invention, the vehicle 1 according to the present invention may further include a vehicle body, a motor, a control device such as an electronic control unit (ECU), and the like.

[0085] As described above, the present invention has been described mainly with reference to the preferred embodiments with reference to the accompanying drawings. However, it is obvious to those skilled in the art that many diverse and obvious modifications can be made without departing from the scope of the present invention from such a description. Therefore, the scope of the present invention should be interpreted by the claims described to include such many modified embodiments.

Explanation of Signs

[0086] 1 Automobile 3 Battery pack 5 Cylindrical battery 10 Electrode assembly structure 100 First electrode assembly 110 First electrode 111 First plain part 120 Second electrode 121 Second plain part 200 Second electrode assembly 210 First electrode 211 First plain part 220 Second electrode 221 Second plain part 300 Separation member 20 First current collector 21 First tab connection part 22 Housing connection part 30 Battery housing 40 Top cap 41 Vent part 50 Terminal 60 Second current collector 61 Terminal connection part 62 Tab connection part 80 Insulator G1 First gasket G2 Second gasket M Separator A Segment piece

Claims

1. In an electrode assembly structure including a first electrode assembly wound around a winding shaft, and a second electrode assembly wound around the winding shaft, adjacent to the first electrode assembly, and located further outward in the radial direction defined as the direction away from the winding shaft than the first electrode assembly, each of the first electrode assembly and the second electrode assembly includes a first electrode including a first plain portion where an active material layer is not coated along the winding direction, a second electrode including a second plain portion where an active material layer is not coated along the winding direction, and a separator interposed between the first electrode and the second electrode, and a laminate including the above is wound around the winding shaft to form a core and an outer peripheral surface. Electrode assembly structure.

2. The electrode assembly structure according to claim 1, wherein at least a part of the plain portion of the first electrode assembly and at least a part of the plain portion of the second electrode assembly include a plurality of segmented pieces divided along the winding direction.

3. The first electrode assembly, During winding, no segmented piece is formed in the portion corresponding to the portion forming the core, The second electrode assembly, During winding, no segmented piece is formed in the portion corresponding to the portion forming the outer peripheral surface. The electrode assembly structure according to claim 2.

4. The electrode assembly structure according to claim 1, wherein the plain portion of the first electrode assembly and the plain portion of the second electrode assembly are bent in the radial direction or the direction opposite to the radial direction.

5. The electrode assembly structure according to claim 1, wherein the plain portion of the first electrode assembly and the plain portion of the second electrode assembly are bent in opposite directions.

6. The plain portion of the first electrode assembly is bent in the direction opposite to the radial direction, The plain portion of the second electrode assembly is bent in the opposite direction. The electrode assembly structure according to claim 1.

7. The electrode assembly structure according to claim 1, including a separation member located between the first electrode assembly and the second electrode assembly.

8. The separation member, The electrode assembly structure according to claim 7, which is configured to have a space formed between the outer peripheral surface of the first electrode assembly and the inner peripheral surface of the second electrode assembly.

9. The separation member, The electrode assembly structure according to claim 7, having a discontinuous shape along the circumferential direction of the outer peripheral surface of the first electrode assembly.

10. The separation member The electrode assembly structure according to claim 7, including a material having electrical insulation properties.

11. The separation member The electrode assembly structure according to claim 7, including a heat-conductive material.

12. The electrode assembly structure according to any one of claims 1 to 11, A battery housing having an opening formed on one side and accommodating the electrode assembly structure through the opening, and being electrically connected to the first electrode, A top cap covering the opening, A terminal protruding outside the battery housing through a closing portion located on the opposite side of the opening and being electrically connected to the second electrode, A first current collector located on one surface of the electrode assembly structure and configured to electrically connect between the electrode assembly structure and the battery housing, A cylindrical battery including the above.

13. The first current collector A first tab coupling portion that couples to the first plain portions of the first electrode assembly and the second electrode assembly respectively, A housing coupling portion that couples to the battery housing, The cylindrical battery according to claim 12, including the above.

14. A battery pack including the cylindrical battery according to claim 12.

15. An automobile including the battery pack according to claim 14.

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