Electrode groove forming device and secondary battery formed thereby

Abstract

An electrode groove forming device according to the present invention comprises: a roller body which forms an electrode groove in an electrode and is formed to be rotatable; a stage which supports the electrode; and protrusions protruding from extension start points on the roller body, wherein the protrusions each have a portion having a certain angle with respect to a virtual line extending from the center of the roller body toward the extension start point.

Description

Electrode groove forming device, secondary battery formed thereby

[0001] Cross-citation with related applications

[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2024-0141631 filed October 16, 2024 and Korean Patent Application No. 10-2025-0143509 filed October 1, 2025, and all contents disclosed in the documents of said Korean patent applications are incorporated herein as part of this specification.

[0003] Technology field

[0004] The present invention relates to a roller, an electrode groove forming device including the same, and a secondary battery formed by the same.

[0005] A secondary battery for generating electricity comprises a battery case, an electrode assembly housed in the battery case, and an electrolyte. The electrode assembly may include a plurality of electrodes and a plurality of separators repeatedly stacked between the electrodes. When manufacturing the plurality of electrodes and separators by stacking, pressure must be increased to enhance the adhesion between the electrodes and separators; however, problems such as damage to the electrodes and separators may occur during this process, necessitating improvements in the manufacturing process.

[0006] The present invention provides a secondary battery or a roller for manufacturing a secondary battery and an electrode groove forming device including the same, for increasing the adhesion between the electrode and the separator and preventing gas from being trapped between the electrode and the separator.

[0007] The technical problems to be solved in this document are not limited to those mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art to which this disclosure belongs from the description below.

[0008] An electrode groove forming device according to one embodiment of the present invention comprises a roller body configured to form an electrode groove in an electrode and configured to rotate, a stage configured to support the electrode, and a projection protruding from an extension starting point on the roller body, wherein the projection includes a portion having a predetermined angle with respect to an imaginary line extending from the center of the roller body toward the extension starting point.

[0009] The above protrusion can form a curve.

[0010] The above-mentioned protrusions are provided in multiple numbers, and the multiple protrusions can be bent in the same direction with respect to an imaginary line.

[0011] The above projection may include a first projection portion extending from an extension starting point and a second projection portion extending from the first projection portion by being bent at a bending portion at a predetermined angle with respect to the first projection portion.

[0012] The above-mentioned bent portion can be configured to form an electrode groove.

[0013] The roller body may be configured to rotate in a forward direction, which is the direction in which the extension direction forming a predetermined angle moves toward the electrode, or in a reverse direction, which is the opposite direction of the forward direction.

[0014] The above-mentioned protrusion may be configured such that the depth of the electrode groove formed while the roller body is rotated in the reverse direction is shallower than the depth of the electrode groove formed while the roller body is rotated in the forward direction.

[0015] The above protrusion can be configured to be deformable.

[0016] The above protrusions may have a fabric material.

[0017] The above stage is configured to slide, and the projection may be configured to come into contact with the electrode and form the electrode groove as the stage slides and moves the electrode.

[0018] The above stage may be configured to slide along the length of the electrode.

[0019] The extension direction forming a predetermined angle of the above-mentioned projection may be included within the same plane as the sliding movement direction of the above-mentioned stage.

[0020] The above roller body can be configured so that the rotational speed is adjustable.

[0021] The roller body can be configured so that the gap between it and the stage can be adjusted.

[0022] The roller body and the projection are defined as rollers, and the rollers may be configured to roll electrodes.

[0023] A roller according to one embodiment of the present invention comprises a roller body configured to rotate and a plurality of protrusions protruding from an extension starting point on the roller body, wherein the plurality of protrusions include a portion having a predetermined angle with respect to an imaginary line extending from the center of the roller body toward the extension starting point.

[0024] The above plurality of protrusions can form a curve.

[0025] The above plurality of protrusions can be bent in the same direction with respect to an imaginary line.

[0026] The above plurality of protrusions may include a first part extending from an extension starting point and a second part extending by being bent at a bending portion at a predetermined angle with respect to the first part.

[0027] A secondary battery according to one embodiment of the present invention includes a plurality of electrodes having a plurality of electrode grooves formed therein and arranged therein to be stacked, a separator that is alternately stacked with the plurality of electrodes, and a battery case that accommodates the electrodes and the separator, wherein the plurality of electrode grooves are formed parallel to each other on the electrodes.

[0028] An electrode assembly manufactured by a roller and groove forming device for manufacturing a secondary battery according to one embodiment of the present invention increases the adhesion between the electrode and the separator and prevents or alleviates gas being trapped between the electrode and the separator. In addition, a secondary battery manufactured with such an electrode assembly has improved durability and safety.

[0029] The effects obtainable from the present invention are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art to which the present disclosure belongs from the description below.

[0030] The following drawings attached to this specification illustrate embodiments of the present invention and serve to further enhance understanding of the technical concept of the present invention together with the detailed description of the invention provided below; therefore, the present invention should not be interpreted as being limited only to the matters described in such drawings.

[0031] FIG. 1 is an assembly diagram of a secondary battery according to a first embodiment of the present invention.

[0032] FIG. 2 is a perspective view illustrating a roller for manufacturing the electrode shown in FIG. 1 and the electrode manufactured thereby.

[0033] Figure 3 is a cross-sectional view showing the roller shown in Figure 2 cut by a plane perpendicular to the longitudinal direction.

[0034] Figure 4 is an enlarged cross-sectional view of the part relating to the protrusion shown in Figure 3.

[0035] FIG. 5 is a conceptual diagram illustrating that when the roller shown in FIG. 3 rotates in the forward direction, an electrode groove is formed on the electrode.

[0036] FIG. 6 is a conceptual diagram illustrating that when the roller shown in FIG. 3 rotates in the reverse direction, an electrode groove is formed on the electrode.

[0037] FIG. 7 is an enlarged cross-sectional view illustrating a portion relating to a protrusion according to a second embodiment of the present invention.

[0038] FIG. 8 is an enlarged cross-sectional view illustrating a portion relating to a protrusion according to a third embodiment of the present invention.

[0039] FIG. 9 is a conceptual diagram illustrating that when a roller according to the fourth embodiment of the present invention rotates in the forward direction, an electrode groove is formed in the electrode.

[0040] FIG. 10 is an assembly drawing illustrating a secondary battery according to the fifth embodiment of the present invention.

[0041] In parts of the attached drawings, corresponding components are given the same reference numerals. Those skilled in the art understand that the drawings are intended to illustrate elements simply and clearly and are not necessarily drawn to scale. For example, to aid in understanding various embodiments, the dimensions of some elements depicted in the drawings may be exaggerated compared to others. Additionally, elements of known technology that are useful or essential in commercially viable embodiments may often be omitted so as not to hinder the spirit of the various embodiments of the present invention.

[0042] Hereinafter, embodiments of the present invention are described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. However, the present invention may be embodied in various different forms and is not limited or restricted by the following embodiments.

[0043] In order to clearly explain the present invention, detailed descriptions of related prior art that are irrelevant to the explanation or that may unnecessarily obscure the essence of the invention have been omitted. Furthermore, when assigning reference numerals to the components of each drawing in this specification, identical or similar reference numerals are assigned to identical or similar components throughout the entire specification.

[0044] Furthermore, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted in a meaning and concept consistent with the technical spirit of the invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention.

[0045] The various embodiments of this document and the terms used therein are not intended to limit the technical features described in this document to specific embodiments, and should be understood to include various modifications, equivalents, or substitutions of said embodiments.

[0046] In relation to the description of the drawings, similar reference numerals may be used for similar or related components.

[0047] The singular form of the noun corresponding to the item may include one or multiple items, unless the relevant context clearly indicates otherwise.

[0048] In this document, each of the phrases such as "A or B", "at least one of A and B", "at least one of A or B", "A, B or C", "at least one of A, B and C", and "at least one of A, B, or C" may include any one of the items listed together in the corresponding phrase, or all possible combinations thereof.

[0049] The term "and / or" includes a combination of multiple related described components or any of the multiple related described components.

[0050] Terms such as “first,” “second,” or “first” or “second” may be used simply to distinguish one component from another and do not limit the components in other aspects (130a-1) (e.g., importance or order).

[0051] Where any (e.g., 1st) component is referred to as "coupled" or "connected" to another (e.g., 2nd) component, with or without the terms "functionally" or "communicationly," it means that said any component may be connected to said other component directly (e.g., via a wire), wirelessly, or through a third component.

[0052] Terms such as "include" or "have" are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in this document, and do not preclude the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0053] When it is said that a component is "connected," "combined," "supported," or "in contact" with another component, this includes not only cases where the components are directly connected, combined, supported, or in contact, but also cases where they are indirectly connected, combined, supported, or in contact through a third component.

[0054] When it is said that a component is located "on" another component, this includes not only cases where one component is in contact with the other, but also cases where another component exists between the two components.

[0055] Meanwhile, terms such as "up-and-down direction," "downward side," and "front-backward direction" used in the following description are defined based on the drawings, and the shape and position of each component are not limited by these terms.

[0056] Since multiple electrodes and multiple separators may move as a single unit, they need to be well bonded to each other. In this case, if the surface of the electrode is relatively smooth, a problem may arise where the bonding strength is reduced due to reasons such as a small contact area with the separator.

[0057] Furthermore, when an electrode and a separator are housed in a battery case and an activation process for charging and discharging is performed, gas may be generated within the secondary battery. To address this, a degas process is performed to move and remove the gas generated by the activation process; however, problems may arise where gas removal is not smooth, such as gas remaining between the electrode and the separator while moving the gas for the degas process. For example, gas located between the electrode and the separator can hinder the movement of ions between the electrodes, thereby causing problems that prevent the smooth generation of electricity.

[0058] In consideration of these problems, the present invention provides a roller and an electrode groove forming device including the same, for increasing the adhesion between the electrode and the separator and preventing or mitigating gas from being trapped between the electrode and the separator.

[0059] Hereinafter, embodiments according to the present invention will be described in detail with reference to the attached drawings.

[0060] First embodiment

[0061] FIG. 1 is an assembly diagram of a secondary battery (B) according to a first embodiment of the present invention.

[0062] Referring to FIG. 1, the secondary battery (B) of the present invention will be described.

[0063] As shown in FIG. 1, a secondary battery (B) for generating electricity may be provided.

[0064] The secondary battery (B) may include a battery case (20) and an electrode assembly (EA) housed in the battery case (20). Here, the battery case (20) is illustrated as a pouch type, but if necessary, the battery case (20) may be cylindrical or prismatic. The electrode assembly (EA) may include a plurality of electrodes (10) and a plurality of separators stacked between the plurality of electrodes (10).

[0065] The enlarged view of the electrode assembly (EA) illustrated in FIG. 1 is an enlarged view of the surface of the electrode (10) included in the electrode assembly (EA). The electrode (10) may include a current collector (not shown) and a coating layer located on the current collector. Here, the coating layer may include an active material, a binder, and a conductive material. In one embodiment of the present invention, the electrode (10) of the electrode assembly (EA) may have an electrode groove (10H) formed on its surface. For example, the electrode groove (10H) may be formed to have a depth of several μm in the coating layer located on the current collector. By forming the electrode groove (10H) on the surface of the electrode (10), the contact area with the separator may be increased, for example. Accordingly, the adhesion between the electrode (10) and the separator may be improved.

[0066] Furthermore, as the electrode groove (10H) is formed in one direction, it may be easy for gas to move along the electrode groove (10H). For example, a secondary battery (B) may perform an activation process in which an electrode assembly (EA) is housed in a battery case (20), an electrolyte is housed in the battery case (20), and then charging and discharging are performed. As the activation process proceeds, gas may be formed by the reaction between the electrolyte and the coating layer. A degas process may be performed to remove the formed gas after the activation process. Even if an attempt is made to extract the gas from the battery case (20) to remove it, the gas may be trapped between the electrode (10) and the separator and unable to come out. However, as in the electrode (10) of the present invention, when the electrode groove (10H) is formed in one direction, gas can move along the electrode groove (10H), thus facilitating gas discharge even after the activation process.

[0067] Furthermore, by forming the electrode groove (10H), the electrode (10) has reduced diffusion resistance, and the electrical conductivity of the electrode (10) itself can be increased.

[0068] At this time, the electrode groove (10H) can be formed along the longitudinal direction of the electrode (10) so that the electrode groove (10H) can be formed even though the width of the roller (100) and the stage described later is relatively small. At this time, the electrode groove (10H) can be provided in multiple numbers. The multiple electrode grooves (10H) can be formed parallel to each other so that the gas formed by the activation process moves in the same direction, thereby facilitating the discharge of the gas. For example, the multiple electrode grooves (10H) can be extended along the longitudinal direction of the electrode (10).

[0069] As seen above, various advantages can be obtained when an electrode groove (10H) is formed in the electrode (10). Below, an apparatus for forming an electrode groove (10H) in the electrode (10) is described.

[0070] FIG. 2 is a perspective view showing a roller (100) for manufacturing the electrode (10) shown in FIG. 1 and the electrode (10) manufactured thereby. FIG. 3 is a cross-sectional view showing the roller (100) shown in FIG. 2 cut in a plane perpendicular to the longitudinal direction. FIG. 4 is an enlarged cross-sectional view showing the portion of the projection (120) shown in FIG. 3.

[0071] Referring to FIGS. 2 to 4, a roller (100) and an electrode groove forming device (1) configured to form an electrode (10) having an electrode groove (10H) formed therein according to the first embodiment of the present invention will be described.

[0072] An electrode groove forming device (1) configured to form an electrode groove (10H) on an electrode (10) may include a roller (100) and a stage (200) (see FIGS. 5 and 6). At this time, the stage (200) may be omitted as needed. Here, the roller (100) may be used in the rolling process of the electrode (10). However, a roller (100) for forming the electrode groove (10H) may be provided separately as needed.

[0073] As illustrated in FIG. 2, the roller (100) may include a roller body (110) configured to rotate and a projection (120) protruding from the roller body (110). As the roller body (110) rotates, the projection (120) rotates together with it, and by the projection (120) coming into contact with the surface of the electrode (10), a portion of the electrode (10) can be removed, thereby forming an electrode groove (10H). A plurality of projections (120) may be provided to form a plurality of electrode grooves (10H) on the electrode (10).

[0074] At this time, as illustrated in FIGS. 3 and 4, the projection (120) may protrude from an extension starting point (120P) on the roller body (110). The projection (120) may include a portion having a predetermined angle with respect to an imaginary line (120L) extending from the center of the roller body (110) toward the extension starting point (120P). For example, the imaginary line (120L) extending from the center of the roller body (110) toward the extension starting point (120P) may be radial with respect to the cross-section of the roller body (110), and the projection (120) may include a portion having an angle different from the radial direction with respect to the cross-section of the roller body (110). Due to the portion having an angle different from the radial direction of the projection (120), the depth of the electrode groove (10H) may be varied according to the rotational direction of the roller (100), as described later. Meanwhile, the total length of the protrusion (120) can be designed to vary depending on the depth of the required electrode groove (10H), and in this embodiment, it can be in the order of several μm.

[0075] As an example regarding the shape of the protrusion (120), as shown in FIG. 4, the protrusion (120) may be extended from the extension starting point (120P) to overlap with a virtual line (120L) for a predetermined length, and then be extended by bending to the left after a certain point. Alternatively, the protrusion (120) may form a curve. In this case, the protrusions (120) provided in plurality may all have corresponding shapes. In other words, the plurality of protrusions (120) may be bent in the same direction with respect to the virtual line (120L).

[0076] Here, the protrusion (120) may have a fabric material such as cellulose, velvet, etc., according to one embodiment. Additionally, the protrusion (120) is configured to be deformable so as to prevent or inhibit damage to the electrode (10) while the electrode groove (10H) is formed on the electrode (10).

[0077] The process of forming an electrode groove (10H) using the roller (100) described above is explained.

[0078] FIG. 5 is a conceptual diagram illustrating that when the roller (100) shown in FIG. 3 rotates in the forward direction, an electrode groove (10H) is formed on the electrode (10). FIG. 6 is a conceptual diagram illustrating that when the roller (100) shown in FIG. 3 rotates in the reverse direction, an electrode groove (10H) is formed on the electrode (10).

[0079] Referring to FIGS. 5 and 6, it is explained that an electrode groove (10H) is formed in an electrode (10) using a roller (100) according to the first embodiment of the present invention.

[0080] As previously described, the electrode groove forming device (1) may further include a stage (200). As shown in FIG. 5, the stage (200) may support the electrode (10) from below. According to one embodiment, the stage (200) may be configured to slide. Based on FIG. 5, the stage (200) may be moved toward the right. As the stage (200) moves, the electrode (10) positioned on the stage (200) may also be moved to the right. At this time, the movement of the roller (100) may be fixed to the left and right, but the electrode (10) may move relatively closer to the roller (100). Accordingly, when the protrusion (120) touches the electrode (10), an electrode groove (10H) may be formed on the electrode (10). That is, the protrusion (120) can be configured to come into contact with the electrode (10) and form an electrode groove (10H) by sliding the stage (200) to move the electrode (10). Meanwhile, in another embodiment, both the stage (200) and the roller (100) may be configured to be movable, or the stage (200) may be fixed and only the roller (100) may be movable.

[0081] According to one embodiment, the stage (200) may be configured to slide along the longitudinal direction of the electrode (10). Accordingly, the electrode groove (10H) may be formed along the longitudinal direction of the electrode (10).

[0082] Furthermore, the extension direction forming a predetermined angle of the projection (120) may be included within the same plane as the sliding movement direction of the stage (200). For example, the extension direction of the projection (120) may be defined on the cross-section of the roller body (110). Accordingly, the virtual trace formed by the rotation of the projection (120) may be defined on the cross-section of the roller body (110). Thus, the projection (120) can form an electrode groove (10H) parallel to the longitudinal direction of the electrode (10).

[0083] According to one embodiment, the roller body (110) may be configured to rotate in a forward direction, which is the direction facing a predetermined angle, or in a reverse direction, which is the opposite direction of the forward direction. The projection (120) may be configured such that the depth of the electrode groove (10H) formed while the roller body (110) is rotated in the reverse direction is shallower than the depth of the electrode groove (10H) formed while the roller body (110) is rotated in the forward direction. FIG. 5 illustrates an example of the roller body (110) being rotated in the forward direction. While the roller body (110) is rotated in the forward direction, the end of the projection (120) comes into direct contact with the electrode (10), so the electrode groove (10H) can be formed relatively deeply in the electrode (10). FIG. 6 illustrates an example of the roller body (110) being rotated in the reverse direction. While the roller body (110) is rotated in the reverse direction, the outer surface of the projection (120) comes into direct contact with the electrode (10), so the electrode groove (10H) can be formed relatively shallowly in the electrode (10). In another embodiment, the extension direction forming a predetermined angle of the projection (120) may be opposite to the sliding direction of the stage (200). In this case, the projection (120) comes into contact with the electrode with a stronger frictional force, and accordingly, the electrode groove (10H) can be formed relatively deeper.

[0084] The roller body (110) is configured to allow for adjustable rotational speed, thereby allowing for adjustment of the depth of the electrode groove (10H). The roller body (110) may be configured to allow for adjustment of the gap between it and the stage (200). Accordingly, the depth of the electrode groove (10H) can be adjusted. According to one embodiment, the roller body (110) may be movable up and down relative to the stage (200).

[0085] The first embodiment and other embodiments are described below. Content common to the first embodiment will be omitted as much as possible, and the other embodiments will be described focusing on the differences. Meanwhile, it is obvious that if content not explained in the other embodiments is necessary, it can be supplemented through the content of the first embodiment.

[0086] 2nd embodiment

[0087] FIG. 7 is an enlarged cross-sectional view illustrating a portion of a projection (120) according to a second embodiment of the present invention.

[0088] Referring to FIG. 7, a projection (120) according to a second embodiment of the present invention will be described.

[0089] The second embodiment differs from the first embodiment in that the degree of bending of the protrusion (120) is different.

[0090] The projection (120) may include a first projection portion (121-1) extending from an extension starting point (120P) and a second projection portion (122-1) extending from the first projection portion (121-1) by being bent at a bend portion (123-1) at a predetermined angle with respect to the first projection portion (121-1). Based on FIG. 7, the first projection portion (121-1) may be extended downward, and the second projection portion (122-1) may be extended upward at a predetermined angle with respect to the first projection portion (121-1).

[0091] The bent portion (123-1) can be defined as the space between the first protrusion portion (121-1) and the second protrusion portion (122-1). The bent portion (123-1) can be configured to form an electrode groove (10H) by making direct contact with the electrode (10). Since the bent portion (123-1) is formed by two parts, the first protrusion portion (121-1) and the second protrusion portion (122-1), the electrode (10) can be pressed more rigidly than when the electrode (10) is pressed only by the first protrusion portion (121-1). Therefore, the formation of the electrode groove (10H) by the bent portion (123-1) can be relatively easy. Furthermore, since the rigidity of the bent portion (123-1) is stronger than that of the first protrusion portion (121-1), damage to the protrusion (120) can be prevented.

[0092] Third embodiment

[0093] FIG. 8 is an enlarged cross-sectional view illustrating a portion of a projection (120-2) according to a third embodiment of the present invention.

[0094] Referring to FIG. 8, a projection (120-2) according to a third embodiment of the present invention will be described.

[0095] The third embodiment differs from the first embodiment in that the shape of the protrusion (120-2) is different.

[0096] The projection (120-2) can be extended from the extension starting point (120P) to have a predetermined angle with the imaginary line (120L). As shown in FIG. 8, the projection (120-2) can be extended along an imaginary straight line having a predetermined angle with the imaginary line (120L).

[0097] 4th embodiment

[0098] FIG. 9 is a conceptual diagram illustrating that when a roller (100) according to the fourth embodiment of the present invention rotates in the forward direction, an electrode groove (10H) is formed in the electrode (10).

[0099] Referring to FIG. 9, the rotational direction of the roller (100-3) according to the fourth embodiment of the present invention is defined.

[0100] The fourth embodiment differs from the first embodiment in that the definition of the forward direction is different.

[0101] The forward rotation direction of the roller (100-3) in the fourth embodiment may be the same as the reverse direction in the first embodiment. Depending on the forward rotation of the roller (100-3), the protrusion (120-3) may form a deep electrode groove (10H).

[0102] Fifth embodiment

[0103] FIG. 10 is an assembly drawing illustrating a secondary battery (B) according to the fifth embodiment of the present invention.

[0104] Referring to FIG. 10, an electrode groove (10H-1) according to the fifth embodiment of the present invention will be described.

[0105] The fifth embodiment differs from the first embodiment in that the extension direction of the electrode groove (10H-1) is different.

[0106] According to one embodiment, the electrode groove (10H-1) may be extended in the width direction of the electrode (10). Since the electrode (10) has a shorter width direction than the length direction, the electrode groove (10H-1) according to the fifth embodiment may have a greater number and a shorter length than that of the first embodiment. In this case, the gas generated by the activation process located between the electrode grooves (10H-1) according to the fifth embodiment can be discharged even if it travels a shorter distance than the electrode groove (10H) of the first embodiment, so it may be easier to discharge the gas.

[0107] Unless explicitly stated otherwise, the embodiments described above may be combined with other embodiments. Alternatively, unless explicitly limited in the combination of any embodiment with another, it should be considered that combinations between embodiments are possible. Any combination of any embodiment with another embodiment is deemed to be disclosed herein.

[0108] Although the present invention has been described above by limited embodiments and drawings, the present invention is not limited thereto, and various implementations are possible within the scope of the technical spirit of the present invention and the equivalent scope of the claims described below by those skilled in the art to which the present invention belongs.

Claims

1. An electrode groove forming device configured to form an electrode groove in an electrode, A roller body configured to rotate; A stage configured to support the above electrode; and It includes a projection protruding from an extension starting point on the roller body, and The above-mentioned projection is an electrode groove forming device comprising a portion having a predetermined angle with respect to a virtual line extending from the center of the roller body toward the extension starting point.

2. In Paragraph 1, The above-mentioned protrusion is an electrode groove forming device that forms a curve.

3. In Paragraph 1, The above protrusions are provided in multiple numbers on the roller body, and A plurality of the above-mentioned protrusions are electrode groove forming devices bent in the same direction with respect to the above-mentioned imaginary line.

4. In Paragraph 1, The above protrusion is, A first projection portion extending from the above extension starting point; and An electrode groove forming device comprising a second protrusion portion that is bent and extended from the first protrusion portion at a predetermined angle with the first protrusion portion.

5. In Paragraph 4, The above-mentioned bending portion is configured to form the electrode groove, forming an electrode groove forming device.

6. In Paragraph 1, The above roller body is configured to rotate in a forward direction, which is the direction in which the extension direction forming the above predetermined angle moves toward the electrode, or in a reverse direction, which is the opposite direction of the above forward direction, in an electrode groove forming device.

7. In Paragraph 6, The above-mentioned protrusion is an electrode groove forming device configured such that the depth of the electrode groove formed while the roller body is rotated in the reverse direction is shallower than the depth of the electrode groove formed while the roller body is rotated in the forward direction.

8. In Paragraph 1, The above-mentioned protrusion is configured to be deformable. Electrode groove forming device.

9. In Paragraph 1, The above-mentioned protrusion is an electrode groove forming device having a fabric material.

10. In Paragraph 1, The above stage is configured to slide, and The above-described protrusion is configured to form an electrode groove by contacting the electrode and forming the electrode groove as the stage slides to move the electrode.

11. In Paragraph 10, The above stage is an electrode groove forming device configured to slide in the longitudinal direction of the electrode.

12. In Paragraph 10, An electrode groove forming device in which the extension direction forming the predetermined angle of the above-mentioned projection is included within the same plane as the sliding movement direction of the above-mentioned stage.

13. In Paragraph 1, The above roller body is an electrode groove forming device configured to allow for adjustable rotational speed.

14. In Paragraph 10, The above roller body is an electrode groove forming device configured to allow for adjustable spacing between it and the above stage.

15. In Paragraph 1, The above roller body and the above projection are defined as rollers, and The above roller is an electrode groove forming device configured to roll the above electrode.

16. A roller body configured to rotate; and It includes a plurality of protrusions protruding from an extended starting point on the roller body, and A roller comprising a plurality of protrusions having a portion having a predetermined angle with respect to an imaginary line extending from the center of the roller body toward the extension starting point.

17. In Paragraph 16, The above plurality of protrusions form a curved roller.

18. In Paragraph 16, The above plurality of protrusions are rollers bent in the same direction with respect to the above imaginary line.

19. In Paragraph 16, The above plurality of protrusions A first portion extending from the above extension starting point; and A roller comprising a second part that is bent and extended at a predetermined angle with respect to the first part in the first part.

20. Electrodes having multiple electrode grooves formed and arranged in multiple numbers to be stacked; A separator layer alternately stacked with a plurality of the above electrodes; and It includes a battery case that accommodates the electrode and separator, and A secondary battery in which the plurality of electrode grooves are formed parallel to each other on the electrode.

Images