Electrode processing apparatus

Abstract

The present invention relates to an electrode processing apparatus, and provides an electrode processing apparatus including: an electrode cutting unit including a first cutter for cutting an electrode; and a deburring unit including a second cutter for cutting burrs protruding from the cut electrode cutting surface in the cutting direction of the first cutter.

Description

Electrode processing device

[0001] Cross-citation with related applications

[0002] This application claims the benefit of priority from Korean Patent Application No. 10-2023-0099241, filed July 28, 2023, the entire contents of which are incorporated herein by reference.

[0003] Technology field

[0004] The present invention relates to an electrode processing device, and more specifically, to an electrode processing device capable of cutting an electrode and removing burrs generated from the electrode during cutting.

[0005] Secondary batteries are highly applicable to a wide range of product groups and possess electrical properties that enable high energy density. These batteries are used not only in portable electronic devices but also in electric or hybrid vehicles powered by electrical power sources, as well as in power storage devices. Secondary batteries are attracting attention as a new energy source for environmental friendliness and energy efficiency, not only because they can dramatically reduce fossil fuel use, but also because they produce no byproducts from energy use.

[0006] The electrode assembly included in the secondary battery includes a separator and an electrode, and depending on the manufacturing method of the electrode assembly, it can be classified into a jelly-roll type in which a separator is interposed between sheet-shaped positive and negative electrodes coated with electrode active materials and wound, a stack type in which a plurality of positive and negative electrodes are sequentially stacked with a separator interposed between them, and a stack / folding type in which stacked unit cells are wound with a long separator film.

[0007] The manufacturing process of a jelly-roll type electrode assembly requires a process of cutting the electrodes to be included in the electrode assembly to the intended length. When cutting the uncoated portion of the electrode where the electrode active material is not coated, the problem of burrs forming on the cut surface does not occur. However, when cutting the support portion where the electrode active material is coated, the problem of burrs protruding from the electrode active material located on the cut surface along the cutting direction may occur. The burrs generated by cutting the support portion of the electrode can cause damage to the adjacent separator, such as bending, in the electrode assembly manufactured by winding the electrode and separator. Therefore, the development of technology to solve the above problems is urgent.

[0008] The present invention is intended to solve the above problem, and provides an electrode processing device capable of removing burrs generated from a cutting surface when cutting a holding portion of an electrode, which is a region coated with an electrode active material.

[0009] As a first embodiment of the present invention, the present invention provides an electrode processing device including an electrode cutting unit including a first cutter for cutting an electrode; and a deburring unit including a second cutter for cutting a burr protruding from the cut electrode cutting surface in the cutting direction of the first cutter.

[0010] Additionally, the electrode cutting part may further include a pair of first holders coupled to both sides of the first cutter; and a first support part formed with a first guide rail guiding the first holder.

[0011] Additionally, the second cutter can be driven in a direction crossing the direction in which the first cutter cuts the electrode.

[0012] Additionally, the second cutter can be driven in a direction parallel to the direction in which the electrode is arranged.

[0013] In addition, the deburring part may further include a pair of second holders coupled to both sides of the second cutter; and a second support part having a second guide rail formed thereon to guide the second holder.

[0014] Additionally, the second cutter may protrude from the second holder in a direction in which the second cutter cuts the burr.

[0015] Additionally, the tip of the second cutter may be positioned closer to the electrode than the second holder.

[0016] In addition, the second cutter is arranged parallel to the electrode, and the surface facing the electrode can be formed into a flat shape.

[0017] Additionally, the second cutter may include a first part coupled to the second holder; a second part having one end connected to the first part and forming a predetermined angle with respect to the first part in a direction toward the electrode; and a third part having one end connected to the second part and arranged parallel to the electrode.

[0018] In addition, the third portion may be formed with a plane shape on a surface facing the electrode, and the other end may extend in a straight line along the length direction.

[0019] Additionally, a guard groove is formed along the longitudinal direction on one side of the first cutter, and the second cutter can be driven so that the end portion is inserted into the guard groove.

[0020] Additionally, the deburring unit can be driven as the electrode is cut.

[0021] Additionally, the first cutter can be fixed in position for a predetermined period of time after cutting the electrode.

[0022] Additionally, the second cutter is driven to move toward one side of the first cutter whose position is fixed, and can cut the burr located on one side of the first cutter.

[0023] Additionally, the second cutter can cut the burr by contacting one side of the first cutter located forward in the moving direction of the second cutter.

[0024] Additionally, the above-mentioned burr may further include a pressurizing portion for pressing the cut electrode.

[0025] In addition, it may further include a winding unit for winding the pressurized electrode together with a separator.

[0026] Additionally, the winding part can wind the electrode so that the area where the burr is cut faces outward.

[0027] As a second embodiment of the present invention, the present invention provides an electrode assembly in which at least one of an electrode and a separator is laminated and wound, the electrode assembly including: a current collector; and an electrode active material coated on an inner surface and an outer surface of the current collector, wherein the electrode active material located on the outer surface of the end of the electrode has a higher density than an adjacent area.

[0028] The present invention can manufacture an electrode having a flat surface by removing a burr protruding from a cutting surface along a cutting direction when cutting a maintenance area of ​​an electrode, which is a region coated with an electrode active material, and can manufacture an electrode assembly with a reduced possibility of damage to a separator.

[0029] In addition, since the electrode is cut so that the holding portion is located at both ends of the electrode, the ratio of the holding portion that generates electrical energy to the total area of ​​the electrode can be maximized, and a secondary battery with increased electrical energy capacity per unit volume can be manufactured.

[0030] Figure 1 is a cross-sectional view sequentially showing the process of processing an electrode by the electrode cutting device of the present invention.

[0031] Fig. 2 is a perspective view showing the appearance of an electrode and an electrode cutting device as a first embodiment of the present invention.

[0032] FIG. 3 is a cross-sectional view schematically showing a driving method of an electrode cutting device of the present invention, in which a second cutter moves to cut a burr after a first cutter cuts an electrode.

[0033] FIG. 4 is a cross-sectional view schematically showing a driving method of an electrode cutting device of the present invention, in which a second cutter comes into contact with a first cutter and cuts a burr.

[0034] FIG. 5 is a cross-sectional view schematically showing a driving method of an electrode cutting device of the present invention, in which a second cutter cuts a burr and then a first cutter returns.

[0035] FIG. 6 is a cross-sectional view schematically showing a driving method of an electrode cutting device of the present invention, in which the second cutter returns after cutting the burr.

[0036] Figure 7 is an enlarged cross-sectional view of area 'A' of Figure 4.

[0037] Fig. 8 is a front view showing the first cutter and first holder of the present invention.

[0038] Fig. 9 is a perspective view showing a first embodiment example of the second cutter of the present invention.

[0039] Fig. 10 is a perspective view showing a second embodiment of the second cutter of the present invention.

[0040] Figure 11 is a cross-sectional view showing an electrode processed by an electrode cutting section and a deburring section being introduced into a pressurizing section.

[0041] Hereinafter, with reference to the attached drawings, preferred embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the invention. However, the present invention may be implemented in various different forms and is not limited or restricted by the following embodiments.

[0042] In order to clearly explain the present invention, a detailed description of a part that is irrelevant to the description or a related known technology that may unnecessarily obscure the gist of the present invention has been omitted, and when adding reference signs to components of each drawing in this specification, the same or similar reference signs are attached to the same or similar components throughout the specification.

[0043] In addition, terms or words used in this specification and claims should not be interpreted as limited to their usual or dictionary meanings, but should be interpreted as meanings and concepts that conform to the technical idea of ​​the present invention based on the principle that the inventor can appropriately define the concept of the term to explain his or her own invention in the best way.

[0044]

[0045] First embodiment

[0046] Referring to FIGS. 1 to 6, the electrode processing device (10) of the present invention may include an electrode cutting unit (200) and a deburring unit (300).

[0047] The electrode processing device (10) of the present invention may be a device for cutting an electrode (100) and processing both ends of the cut electrode (100) to be flat.

[0048] The electrode cutting portion (200) can cut the electrode (100), and more specifically, can cut the region of the electrode (100) coated with the electrode active material (120) among the regions of the electrode (100) coated with the electrode active material (120) on the current collector (110). The electrode (100) may include a holding portion, which is a region coated with the electrode active material (120) on one or both sides of the current collector (110), and a non-coated region, which is a region where the electrode active material (120) is not coated. The electrode cutting portion (200) may be provided to cut the holding portion region, which is coated with the electrode active material (120), among the regions of the non-coated portion and the holding portion of the electrode (100). When the electrode cutting portion (200) cuts the holding portion region, both ends of the electrode (100) can be formed as holding portion regions. By forming the end of the electrode (100) as a holding portion rather than a non-conducting portion, the ratio of the holding portion capable of generating electrical energy in the total area of ​​the electrode (100) can be maximized, and a larger electrical energy capacity can be formed per unit volume in a secondary battery.

[0049] The electrode cutting unit (200) may include a first cutter (210) that cuts the electrode (100). The first cutter (210) may be driven to move toward or away from the electrode (100). The first cutter (210) may cut the electrode (100) by moving toward the electrode (100). The first cutter (210) may be positioned above or below the electrode (100). The first cutter (210) may be driven to reciprocally move toward or away from the electrode (100) so as to repeatedly cut the electrode (100).

[0050] The first cutter (210) can form a predetermined angle with respect to one surface of the electrode (100).

[0051] Referring to FIG. 2, as one embodiment, the first cutter (210) may be positioned vertically with respect to one surface of the electrode (100) so that the tip formed with the blade faces the one surface of the electrode (100). Since the first cutter (210) is driven to move along the vertical direction with respect to the one surface of the electrode (100), the first cutter (210) may cut the holding portion region of the electrode (100) so that the cutting surface of the electrode (100) is vertical with respect to the one surface of the electrode (100). The tip of the first cutter (210) may extend in a straight line along the longitudinal direction.

[0052] In another embodiment, the first cutter (210) may be positioned diagonally with respect to one side of the electrode (100). The first cutter (210) may be driven along the diagonal direction with respect to one side of the electrode (100), and a cutting surface of the electrode (100) cut by the first cutter (210) may have an inclined surface with respect to one side of the electrode (100).

[0053] The electrode cutting part (200) may further include a pair of first holders (211) and a first support part (230).

[0054] Referring to Fig. 8, a pair of first holders (211) can be respectively coupled to one side and the other side of the first cutter (210) in the longitudinal direction. The longitudinal direction of the first cutter (210) may be a direction in which a blade located at the end of the first cutter (210) is formed along one direction, forming the longest length in the first cutter (210).

[0055] A pair of first holders (211) may have one end coupled to the first cutter (210) and the other end protrude outwardly along the length direction of the first cutter (210) more than the first cutter (210).

[0056] The first cutter (210) may be coupled so that the end facing the electrode (100) protrudes further along the width direction of the first cutter (210) than the first holder (211). The width direction of the first cutter (210) is a direction perpendicular to the length direction and the thickness direction, and may refer to the direction in which the first cutter (210) cuts the electrode (100).

[0057] The other end of the first holder (211) is positioned on the first guide rail (231) formed on the first support member (230), and the first holder (211) can be guided along the first guide rail (231).

[0058] A pair of first supports (230) may be provided, and the pair of first supports (230) may be spaced apart from each other by a predetermined distance so that a first cutter (210) may be placed between them.

[0059] The first support member (230) may be arranged in a longitudinal direction parallel to the direction in which the first cutter (210) cuts the electrode (100).

[0060] A first guide rail (231) may be formed along the longitudinal direction of the first support member (230).

[0061] The first guide rail (231) can be formed on a surface where a pair of first support members (230) face each other.

[0062] The first guide rail (231) can be formed so that a pair of first support members (230) are recessed along the length direction of the first support member (230) to a predetermined depth on the surface facing each other.

[0063] The other end of the first holder (211) is inserted into the first guide rail (231), and the first holder (211) can be guided along the longitudinal direction of the first guide rail (231). Since the first cutter (210) has a pair of first holders (211) coupled on both sides, the first holder (211) can be guided together with the first holder (211) as it is guided by the first guide rail (231).

[0064] The first cutter (210) can move closer to or further away from the electrode (100) as guided by the first holder (211). The first cutter (210) can cut the electrode (100) as it moves closer to the electrode (100).

[0065] The deburring section (300) may be provided to cut a burr (130) protruding from the cutting surface of the electrode (100) cut by the first cutter (210) in the cutting direction of the first cutter (210).

[0066] Since the first cutter (210) cuts the supporting portion of the electrode (100), when the electrode active material (120) coated on one or both sides of the current collector (110) is cut by the first cutter (210), the end of the electrode active material (120) located on the cut surface may protrude in the cutting direction of the first cutter (210) along the first cutter (210) moving while cutting the electrode (100). The electrode active material (120) protruding along the cutting direction in this way may form a burr (130). Due to its protruding shape, the burr (130) may apply pressure to the separator (600, 610) in contact with the burr (130) in the electrode assembly, thereby damaging it, and as the separator (600, 610) is damaged, the electrodes (100) of different poles may be electrically connected, which may cause an electrical short-circuit phenomenon.

[0067] The deburring unit may include a second cutter (310, 320) that cuts off a burr (130) protruding from the cut surface of the electrode (100).

[0068] The second cutter (310, 320) can be driven to move in a direction intersecting the direction in which the first cutter (210) cuts the electrode (100) so as to cut the burr (130) protruding from the electrode (100).

[0069] The second cutter (310, 320) can be driven to move in a direction parallel to the direction in which the electrode (100) is arranged, and as the second cutter (310, 320) moves closer to the burr (130), the burr (130) protruding from the electrode (100) can be cut.

[0070] The second cutter (310, 320) may be positioned above or below the electrode (100) depending on the direction in which the first cutter (210) cuts the electrode (100). In one embodiment, when the first cutter (210) is positioned above the electrode (100) and moves from the top to the bottom of the electrode (100) to cut the electrode (100), the second cutter (310, 320) may be positioned below the electrode (100). In another embodiment, when the first cutter (210) is positioned below the electrode (100) and moves from the bottom to the top of the electrode (100) to cut the electrode (100), the second cutter (310, 320) may be positioned above the electrode (100).

[0071] When the first cutter (210) cuts the maintenance portion of the electrode (100), a burr (130) may protrude from the cut surface of the electrode active material (120) along the cutting direction of the first cutter (210).

[0072] Referring to FIGS. 3 to 6, the first cutter (210) is fixed in position for a predetermined period of time after cutting the electrode (100) with one side adjacent to the cut surface of the electrode (100), and a burr (130) protruding from the electrode (100) may be positioned on one side of the first cutter (210). The second cutter (310, 320) may be driven to move toward one side of the first cutter (210) whose position is fixed, and may cut the burr (130) positioned on one side of the first cutter (210). The second cutter (310, 320) may reliably cut and remove the burr (130) by contacting or colliding with one side of the first cutter (210) positioned forward in the moving direction of the second cutter (310, 320). After the burr (130) is cut, the first cutter (210) and the second cutter (310, 320) can return to the position before cutting the electrode (100) and the burr (130).

[0073] Referring to FIGS. 4, 7, and 8, the second cutter (310, 320) can cut the protruding burr (130) by having a tip formed with a blade contact or collide with one side of the first cutter (210). The second cutter (310, 320) may be arranged to continuously and repeatedly cut each burr (130) formed on the electrodes (100) cut by the electrode cutting unit (200) as it reciprocates. As the second cutter (310, 320) continuously and repeatedly cuts the burr (130), it repeatedly contacts or collides with one side of the first cutter (210), so that the tip of the second cutter (310, 320) contacting the first cutter (210) can be easily damaged. Therefore, a guard groove (212) may be formed in the first cutter (210) to prevent damage due to collision.

[0074] The guard groove (212) may be a groove formed along the longitudinal direction of one side of the first cutter (210) so that the end of the second cutter (310, 320) can be inserted therein. Since the end of the second cutter (310, 320) is inserted into the guard groove (212) after cutting the burr (130), damage due to contact or collision with the first cutter (210) can be prevented.

[0075] The deburring unit (300) may further include a pair of second holders (311) and a second support unit (330).

[0076] A pair of second holders (311) may be spaced apart by a predetermined distance so that they can be respectively coupled to one side and the other side in the longitudinal direction of the second cutter (310, 320). The longitudinal direction of the second cutter (310, 320) may be a direction in which a blade located at the end of the second cutter (310, 320) is formed along one direction in the direction that forms the longest length in the second cutter (310, 320).

[0077] A pair of second holders (311) may have one end coupled to the second cutter (310, 320) and the other end protrude further outward than the second cutter (310, 320) along the longitudinal direction of the second cutter (310, 320).

[0078] The other end of the second holder (311) is positioned on the second guide rail (331) of the second support member (330), and the second holder (311) can be guided along the longitudinal direction of the second guide rail (331). As the second holder (311) is guided along the longitudinal direction of the second guide rail (331), the second cutter (310, 320) coupled to the second holder (311) can also be guided along the direction in which the second guide rail (331) is formed together with the second holder (311).

[0079] The second support member (330) can support the second cutter (310, 320) and the pair of second holders (311) so that the second cutter (310, 320) and the pair of second holders (311) can move in a direction parallel to the direction in which the electrode (100) is arranged.

[0080] A pair of second supports (330) may be provided, and the pair of second supports (330) may be spaced apart by a predetermined distance so that the second cutters (310, 320) may be arranged along the longitudinal direction. The pair of second supports (330) may be arranged with their facing sides parallel to each other, and the distance spaced apart along the longitudinal direction may be maintained at a constant level.

[0081] The second support member (330) may be arranged so that the longitudinal direction of the second support member (330) is parallel to the direction in which the second cutter (310, 320) moves to cut the burr (130), and the second support member (330) may be arranged parallel to the direction in which the electrode (100) is arranged in the electrode processing device (10).

[0082] A second guide rail (331) may be formed along the longitudinal direction of the second support member (330). The second guide rail (331) may be formed parallel to the direction in which the electrode (100) is arranged. A pair of second guide rails (331) may be formed on each of the surfaces facing each other on the second support member (330).

[0083] The second guide rail (331) can be formed to be recessed into the outer surface of the second support member (330) to a predetermined depth along the longitudinal direction of the second support member (330).

[0084] The other end of the second holder (311) is inserted into the second guide rail (331), and the second holder (311) can be guided along the longitudinal direction of the second guide rail (331). Since the second cutter (310, 320) has a pair of second holders (311) coupled on both sides, the second holder (311) can be guided together with the second holder (311) as it is guided by the second guide rail (331). The second cutter (310, 320) can move along the arrangement direction of the electrode (100) as it is guided together with the second holder (311).

[0085] The second cutter (310, 320) can move closer to or further away from the burr (130) protruding from the electrode (100) as guided by the second holder (311). The second cutter (310, 320) can cut the electrode (100) as it moves closer to the burr (130).

[0086] The second cutter (310, 320) may be positioned so that it protrudes further from the second holder (311) in the direction in which the second cutter (310, 320) cuts the burr (130). That is, the second cutter (310, 320) may protrude further than the second holder (311) along the width direction of the second cutter (310, 320). The width direction of the second cutter (310, 320) may mean the direction in which the second cutter (310, 320) moves to cut the burr (130) in a direction perpendicular to the length direction and the thickness direction. The second cutter (310, 320) cuts the protruding burr (130) by having its end contact or collide with one side of the first cutter (210), so that the second cutter (310, 320) can be positioned to protrude further than the second holder (311) so that its end can contact or collide with one side of the first cutter (210).

[0087] The tip of the second cutter (310, 320) with the blade formed may be positioned closer to the electrode (100) than the second holder (311). The tip of the second cutter (310, 320) with the blade formed may be positioned as close to the electrode (100) as possible so as to remove as much of the burr (130) protruding from the electrode active material (120) as possible.

[0088] Referring to FIG. 9, as a first implementation example for the second cutter (310), the second cutter (310) can be positioned closer to the electrode (100) than the second holder (311) because the second holder (311) is coupled to the surface facing the electrode (100), and can cut the burr (130) protruding from the electrode (100). The surface of the second cutter (310) facing the electrode (100) is formed in a flat shape, and can be arranged parallel to the electrode (100). The second cutter (310) can move in a direction parallel to the electrode (100) as it is guided by the second holder (311). In addition, the second cutter (310) can cut the burr (130) by contacting or colliding with the first cutter (210) since the second cutter (310) protrudes further than the second holder (311) along the direction in which the burr (130) is cut. The second cutter (310) can have an end extending in a straight line along the length direction so that the end can contact or collide with one side of the first cutter (210) and cut the burr (130).

[0089] Referring to FIG. 10, as a second implementation example for the second cutter (320), the second cutter (320) may include a first portion (321), a second portion (322), and a third portion (323) so that the end portion where the blade is formed can be positioned closer to the electrode (100).

[0090] The first part (321) can be coupled to the surface of the second holder (311) facing the electrode (100). One end of the first part (321) can be coupled to the second holder (311), and the other end can protrude from the second holder (311) in the direction in which the second cutter (320) cuts the burr (130). The first part (321) can stably support the second part (322) and the third part (323) connected to the first part (321) when the third part (323) cuts the burr (130) protruding from the electrode (100).

[0091] The second portion (322) is positioned between the first portion (321) and the third portion (323), and one end may be connected to the first portion (321) and the other end may be connected to the third portion (323). The second portion (322) may be formed to form a predetermined angle with respect to the first portion (321) in a direction approaching the electrode (100) and extend toward the electrode (100). The second portion (322) may be positioned as close to the electrode (100) as possible so that the third portion (323), which cuts the burr (130), can cut as much of the burr (130) protruding from the electrode (100) as possible. The predetermined angle formed by the second part (322) with respect to the first part (321) is sufficient as long as the third part (323) can come close to the electrode (100), and may be a right angle, an acute angle, an obtuse angle, etc.

[0092] The third part (323) may be connected at one end to the second part (322) and may be arranged parallel to the direction in which the electrode (100) is arranged. Since a blade is formed at the other end of the third part (323), the third part (323) may cut the burr (130) protruding from the electrode (100). By being combined with the second part (322), the side of the third part (323) facing the electrode (100) may be arranged very close to the electrode (100), and the burr (130) protruding from the electrode (100) may be cut to the maximum size. The other end of the third part (323) may refer to the end of the second cutter (320).

[0093] The third portion (323) may be formed in a flat shape with a surface facing the electrode (100), and the other end may extend in a straight line along the length direction so that the other end may contact or collide with one side of the first cutter (210) and cut the burr (130). The third portion (323) may be arranged parallel to the direction in which the electrode (100) is arranged and may be driven to move along the direction in which the electrode (100) is arranged.

[0094] Referring to FIG. 11, the electrode processing device (10) may further include a pressurizing unit. The pressurizing unit can remove the protruding residual portion (132) on the electrode by pressing the electrode from which the burr has been cut by the deburring unit (300). The pressurizing unit includes a pair of pressurizing rollers (400), and the pair of pressurizing rollers (400) can rotate in opposite directions. The pair of pressurizing rollers (400) can press the electrode (100) located therebetween and simultaneously move it in one direction. The electrode (100) pressed by the pair of pressurizing rollers (400) can form the density of both ends of the electrode (100) where the protruding residual portion (132) was located to be greater than that of the adjacent area by pressing the protruding residual portion (132).

[0095] The electrode processing device (10) may further include a winding unit (500) that winds the electrode (100) pressed by the pressure roller (400) together with the separator (600, 610). The winding unit (500) may wind at least one of the electrode (100) and the separator (600, 610). More specifically, the winding unit (500) may wind the electrode (100), the separator (600, 610), and another electrode (620) in a state where the separator (600, 610) is positioned between the electrode (100) and the other electrode (620) so that the electrode (100) and the other electrode (620) do not come into contact.

[0096] Second embodiment

[0097] In a second embodiment of the present invention, an electrode assembly (not shown) of the present invention may include at least one of an electrode (100) and a separator (600, 610). The electrode assembly may be a jelly-roll-shaped electrode assembly in which the electrode (100) and the separator (600, 610) are stacked and wound. The electrode (100) may be manufactured by an electrode processing device (10), and a detailed description of the electrode processing device (10) may be replaced by the above-described description.

[0098] Included in the electrode assembly, the wound electrode (100) may include a wound current collector (110) and an electrode active material (120) coated on the inner and outer surfaces of the wound current collector (110). The electrode active material (120) located on the outer surface of the end of the electrode (100) is cut by a second cutter (310, 320) and pressed by a press roller (400), so that it may be formed with a greater density than an adjacent area.

[0099] Third embodiment

[0100] Referring to FIGS. 1 and 3 to 6, in a third embodiment of the present invention, a method for driving an electrode processing device may include an electrode cutting step, a burr cutting step, a pressurizing step, and a winding step.

[0101] The electrode cutting step may be a step in which the first cutter (210) cuts the maintenance portion region of the electrode (100). As the first cutter (210) cuts the maintenance portion of the electrode (100), a burr may protrude from the electrode active material (120) along the cutting direction of the first cutter (210) from the electrode (100). The first cutter (210) that cuts the electrode (100) may be fixed in position adjacent to the cutting surface of the electrode (100) for a predetermined period of time.

[0102] The burr cutting step may be a step in which the deburring unit (300) is driven as the first cutter (210) cuts the electrode (100). As the deburring unit (300) is driven, the second cutter (310, 320) may be driven to move toward one side of the first cutter (210) whose position is fixed in order to cut the burr (130) generated in the electrode cutting step. The end of the second cutter (310, 320) may cut the burr (130) by coming into contact with one side of the first cutter (210). As the burr (130) is cut by the second cutter (310, 320), the detached portion (131) may be separated from the burr (130) and may be positioned between the second cutter (310, 320) and the electrode (100) to form a residual portion (132) that the second cutter (310, 320) could not remove. The residual portion (132) may still protrude from the electrode (100) to a predetermined height.

[0103] The pressing step may be a step for removing the residual portion (132) that the second cutter could not remove. The pressing step may pressurize the electrode (100) by a pair of pressing rollers (400). The pair of pressing rollers (400) may pressurize the electrode (100) located between the pair of pressing rollers (400) by rotating in opposite directions to move the electrode (100) in one direction. The pair of pressing rollers (400) may form the thickness of the electrode (100) uniformly by pressing the residual portion (132) protruding from the electrode (100). As the residual portion (132) is pressed by the pair of pressing rollers (400), the electrode active material (120) at both ends of the electrode (100) may be formed to have a higher density than the adjacent area.

[0104] The winding step may be a step of winding the processed electrode (100) together with the separator (600, 610) through an electrode cutting step, a burr cutting step, and a pressurizing step. More specifically, the winding step may be a step of forming an electrode assembly (not shown) by winding at least one or more of the processed electrode (100), a plurality of separators (600, 610), and another electrode (620) through an electrode cutting step, a burr cutting step, and a pressurizing step.

[0105] The winding step includes an electrode cutting step, a burr cutting step, and a pressurizing step, and when the processed electrode (100) is wound, the electrode (100) can be wound so that the area where the burr (130) is cut faces outward. When a residual portion (132) still exists in the electrode (100) that has gone through the burr cutting step and the pressurizing step, the electrode (100), the separator (600, 610), and the other electrode (620) located outside the residual portion (132) can be wound so that the residual portion (132) faces outward.

[0106]

[0107] Although the present invention has been described above with reference to limited embodiments and drawings, the present invention is not limited thereto, and various embodiments are possible within the scope equivalent to the technical idea of ​​the present invention and the claims to be described below by a person having ordinary skill in the art to which the present invention pertains.

[0108]

[0109] [Explanation of symbols]

[0110] 10: Electrode processing device

[0111] 100: Electrode

[0112] 110: Whole house

[0113] 120: Electrode active material

[0114] 130: Bur

[0115] 131: Separation section

[0116] 132: Residual

[0117] 200: Electrode cutting part

[0118] 210: First cutter

[0119] 211: 1st Holder

[0120] 212: Guard Home

[0121] 230: First support

[0122] 231: First guide rail

[0123] 310, 320: Second cutter

[0124] 311: 2nd Holder

[0125] 321: Part 1

[0126] 322: Part 2

[0127] 323: Part 3

[0128] 330: Second support

[0129] 331: Second guide rail

[0130] 400: Pressure roller

[0131] 600, 610: Membrane

[0132] 620: Other electrodes

Claims

1. An electrode cutting section including a first cutter for cutting the electrode; and An electrode processing device including a deburring unit including a second cutter that cuts a burr protruding from the cut electrode cutting surface in the cutting direction of the first cutter.

2. In paragraph 1, The electrode cutting part is, a pair of first holders coupled to both sides of the first cutter; and An electrode processing device further comprising a first support portion having a first guide rail formed thereon to guide the first holder.

3. In paragraph 1, An electrode processing device in which the second cutter is driven in a direction intersecting the direction in which the first cutter cuts the electrode.

4. In paragraph 2, The above second cutter is an electrode processing device that is driven in a direction parallel to the direction in which the electrode is arranged.

5. In paragraph 3, The above deburring part, a pair of second holders coupled to both sides of the second cutter; and An electrode processing device further comprising a second support part having a second guide rail formed thereon to guide the second holder.

6. In paragraph 5, The second cutter is an electrode processing device in which the second cutter protrudes from the second holder in a direction in which the second cutter cuts the burr.

7. In paragraph 5, An electrode processing device in which the tip of the second cutter is positioned closer to the electrode than the second holder.

8. In paragraph 7, An electrode processing device in which the second cutter is arranged parallel to the electrode and the surface facing the electrode is formed into a flat shape.

9. In paragraph 7, The above second cutter, A first part coupled to the second holder; A second part, wherein one end is connected to the first part and forms a predetermined angle with respect to the first part in a direction closer to the electrode; and An electrode processing device comprising a third part connected to the second part and arranged parallel to the electrode.

10. In paragraph 9, The third part above, The surface facing the above electrode is formed in a flat shape, An electrode processing device in which the other end extends in a straight line along the length direction.

11. In paragraph 1, A guard groove is formed along the longitudinal direction on one side of the first cutter, The above second cutter is an electrode processing device driven so that its end is inserted into the guard groove.

12. In paragraph 1, The above deburring unit is an electrode processing device that is driven as the electrode is cut.

13. In paragraph 1, The above first cutter is an electrode processing device whose position is fixed for a predetermined period of time after cutting the electrode.

14. In paragraph 13, The above second cutter The above position is driven to move toward one side of the fixed first cutter, An electrode processing device for cutting the burr located on one side of the first cutter.

15. In paragraph 14, The above second cutter, An electrode processing device that cuts the burr by contacting one side of the first cutter located forward in the direction of movement of the second cutter.

16. In paragraph 15, An electrode processing device further comprising a pressurizing unit for pressing the electrode from which the above-mentioned burr has been cut.

17. In paragraph 16, An electrode processing device further comprising a winding unit for winding the pressurized electrode together with a separator.

18. In paragraph 17, The above winding unit is an electrode processing device that winds the electrode so that the area where the burr is cut faces outward.

19. An electrode assembly in which at least one of an electrode and a separator is laminated and wound, The above electrodes are, The entire house; and It includes an electrode active material coated on the inner and outer surfaces of the above-mentioned collector, An electrode assembly in which the electrode active material located on the outer surface of the tip of the electrode has a higher density than the adjacent area.

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