Electrode notching apparatus

Abstract

The present invention provides an electrode notching apparatus (10) comprising: a transfer unit (100) that transfers an electrode sheet (50) in a transfer direction parallel to the longitudinal direction of the electrode sheet (50), the electrode sheet (50) comprising a coated portion (52), which is an area coated with an active material, and an uncoated portion (54), which is located on a first side in the width direction relative to the coated portion (52) and is an area not coated with the active material; a laser irradiation unit (200) that irradiates a laser to a notching region (R1) through which the uncoated portion (54) passes; and one or more tension rollers that are each disposed upstream or downstream of the notching region (R1) in the transfer direction and disposed adjacent to the notching region (R1), define the notching region (R1), and are in contact with the uncoated portion (54) to apply tension to a region adjacent to the uncoated portion (54) in the notching region (R1). At least some of the tension rollers may each be a first-type roller that is in contact with a first end of the coated portion (52) on the first side and applies tension to the first end in an adjacent region (R2). The adjacent region (R2) may be located on a second side of the notching region (R1) in the width direction and may be a region through which the first end passes.

Description

Electrode notching device

[0001] The present application claims the benefit of priority based on Korean Patent Application No. 10-2025-0026762 filed February 28, 2025 and Korean Patent Application No. 10-2026-0034069 filed February 24, 2026, and all contents disclosed in the documents of said Korean patent applications are incorporated herein as part of the specification.

[0002] The present invention relates to an electrode notching device, and more specifically, to an electrode notching device that reduces or prevents deformation or damage to an electrode sheet and performs notching correctly and stably.

[0003] Electrode tabs are formed on the uncoated portion of an electrode sheet of a secondary battery using a laser notching device. Conventional laser notching devices apply tension to the uncoated portion passing through the notching area using a pattern jig, and notch with a laser while applying tension to the retaining portion of the electrode sheet using a support member separate from the pattern jig. Consequently, the electrode sheet may be deformed, damaged, or contaminated due to friction with the pattern jig or foreign matter adhering to the pattern jig, requiring the pattern jig to be cleaned periodically. Furthermore, if ripples are present on the electrode sheet or if the direction of travel or position of the electrode sheet changes, notching errors may occur, and the electrode sheet may be deformed or damaged. Therefore, a notching device capable of solving these problems is required.

[0004] A related prior art document is Korean Registered Patent No. 10-2245162.

[0005] The present invention was devised to solve the aforementioned problems and aims to provide an electrode notching device that reduces or prevents deformation or damage to an electrode sheet.

[0006] The present invention aims to provide an electrode notching device that reduces or prevents deformation or damage to an electrode sheet even if ripples are present on the electrode sheet or if the travel direction or position of the electrode sheet changes.

[0007] The present invention aims to provide an electrode notching device in which notching is performed correctly and stably.

[0008] The present invention aims to provide an electrode notching device that stably applies tension to both the retaining part and the non-retaining part.

[0009] The present invention aims to provide an electrode notching device that is implemented with a simple configuration at low cost and reduces maintenance costs.

[0010] The present invention aims to provide an electrode notching device that simply and effectively removes foreign matter and reduces or prevents contamination of the electrode sheet.

[0011] The present invention aims to provide an electrode notching device that applies sufficient tension to an electrode sheet within a notching area even if there are ripples on the electrode sheet or if the travel direction or position of the electrode sheet changes.

[0012] The present invention aims to provide an electrode notching device in which foreign matter is not attached or stuck to the tension roller.

[0013] The present invention aims to provide an electrode notching device in which tension is adjusted in real time according to the condition of the electrode sheet, such as swells.

[0014] The present invention aims to provide an electrode notching device in which an electrode sheet is stably separated into an electrode sheet having an electrode tab formed thereon and scrap.

[0015] The present invention aims to provide an electrode notching device in which an electrode sheet is stably transported.

[0016] The technical problems of the present invention are not limited to the purposes mentioned above, and other unmentioned purposes and advantages of the present invention may be understood from the following description and will be more clearly understood by the embodiments of the present invention. Furthermore, it will be readily apparent that the purposes and advantages of the present invention can be realized by the means and combinations thereof set forth in the claims.

[0017] To solve the above-mentioned problem, the present invention provides an electrode notching device (10) comprising a transfer unit (100), a laser irradiation unit (200), and one or more tension rollers.

[0018] The above transfer unit (100) can transfer the electrode sheet (50) in the transfer direction.

[0019] The above transfer direction may be parallel to the length direction of the electrode sheet (50).

[0020] The above electrode sheet (50) may include a retaining portion (52) and a non-retaining portion (54).

[0021] The above-mentioned maintenance portion (52) may be an area coated with an active material.

[0022] The above-mentioned non-retaining portion (54) may be located on the first side in the width direction relative to the above-mentioned retaining portion (52).

[0023] The above uncoated portion (54) may be an area where no active material is applied.

[0024] The above laser irradiation unit (200) can irradiate a laser to the notching area (R1).

[0025] The above notching area (R1) may be an area through which the above unintelligible part (54) passes.

[0026] One or more of the above tension rollers may be positioned upstream or downstream of the notching area (R1) in the conveying direction, respectively.

[0027] One or more of the above tension rollers may be positioned adjacent to the notching area (R1).

[0028] One or more of the above tension rollers can define the notching area (R1).

[0029] One or more of the above tension rollers can apply tension to the unworn portion (54) within the above notching area (R1).

[0030] At least some of the above tension rollers may each be a first-type roller.

[0031] The first roller can apply tension to the first end of the first side of the retaining part (52) in the adjacent area (R2).

[0032] The above adjacent area (R2) may be located on the second side in the width direction of the above notching area (R1).

[0033] The above adjacent area (R2) may be an area through which the first end passes.

[0034] In one embodiment, the one or more tension rollers may include a first tension roller (312) and a second tension roller (322).

[0035] The first tension roller (312) and the second tension roller (322) can be positioned upstream and downstream of the notching area (R1), respectively, in the conveying direction.

[0036] The first tension roller (312) and the second tension roller (322) may be the first type roller.

[0037] In one embodiment, the one or more tension rollers may include a first tension roller (312) and a third tension roller (314), or a second tension roller (322) and a fourth tension roller (324).

[0038] The first tension roller (312) can be positioned upstream of the notching area (R1) in the conveying direction.

[0039] The first tension roller (312) above may be the first type roller.

[0040] The third tension roller (314) can be positioned upstream of the first tension roller (312) in the conveying direction.

[0041] The third tension roller (314) can be positioned adjacent to the first tension roller (312).

[0042] The second tension roller (322) can be positioned downstream of the notching area (R1) in the conveying direction.

[0043] The second tension roller (322) above may be the first type roller.

[0044] The fourth tension roller (324) can be positioned downstream of the second tension roller (322) in the conveying direction.

[0045] The fourth tension roller (324) can be positioned adjacent to the second tension roller (322).

[0046] The first tension roller (312) and the third tension roller (314) can come into contact with opposite sides of the electrode sheet (50).

[0047] The second tension roller (322) and the fourth tension roller (324) can come into contact with opposite sides of the electrode sheet (50).

[0048] In one embodiment, when the one or more tension rollers include the third tension roller (314), the third tension roller (314) may be the first type roller.

[0049] Alternatively, if the above one or more tension rollers include the fourth tension roller (324), the fourth tension roller (324) may be the first type roller.

[0050] In one embodiment, the laser irradiation unit (200) can irradiate a laser onto the notching area (R1) to form a plurality of electrode tabs (T) on the unlit area (54).

[0051] The plurality of electrode tabs (T) can be spaced apart from each other in the longitudinal direction.

[0052] The plurality of electrode tabs (T) can each protrude toward the first side.

[0053] The above plurality of electrode tabs (T) may have a constant shape and size.

[0054] In the case where the above one or more tension rollers include the first tension roller (312) and the third tension roller (314), the first longitudinal gap (B1) between the pair of contact portions where the first tension roller (312) and the third tension roller (314) each contact the non-contact portion (54) may be greater than 0 and smaller than the maximum longitudinal width of each electrode tab (T).

[0055] Alternatively, in the case where the above one or more tension rollers include the second tension roller (322) and the fourth tension roller (324), the second longitudinal gap (B2) between the pair of contact portions where the second tension roller (322) and the fourth tension roller (324) each contact the non-contact portion (54) may be greater than 0 and smaller than the maximum longitudinal width of each electrode tab (T).

[0056] In one embodiment, the first type roller may have a width-direction section (S) in which the diameter decreases as it moves toward the second side.

[0057] In one embodiment, at least some of the tension rollers may include a main body (302) and a coating layer (304).

[0058] The coating layer (304) can cover the outer circumference of the main body (302).

[0059] The coating layer (304) can be configured to reduce the attachment of foreign matter compared to the main body (302).

[0060] In one embodiment, the coating layer (304) may be formed of a material including tantalum carbide (TaC).

[0061] In one embodiment, the laser irradiation unit (200) can irradiate a laser onto the notching area (R1) to form a plurality of electrode tabs (T) on the unlit area (54).

[0062] The plurality of electrode tabs (T) can be spaced apart from each other in the longitudinal direction.

[0063] The plurality of electrode tabs (T) can each protrude toward the first side.

[0064] The above plurality of electrode tabs (T) may have a constant shape and size.

[0065] Each of the above electrode tabs (T) may have a first side (E1) and a second side (E2).

[0066] The first side (E1) and the second side (E2) can be extended to the first side or the second side.

[0067] The first side (E1) and the second side (E2) may have their ends of the second side corresponding to each other in the width direction.

[0068] The first side (E1) of each of the above electrode tabs (T) may be located upstream of the second side (E2) in the transfer direction.

[0069] The above one or more tension rollers may include a second tension roller (322).

[0070] The second tension roller (322) can be positioned downstream of the notching area (R1) in the conveying direction.

[0071] The above-mentioned non-removable portion (54) may have a contact portion (C2) that contacts the second tension roller (322).

[0072] The first longitudinal distance (D1) from the first notching point (N1) within the notching area (R1) forming the end of the second side of the first side (E1) of each electrode tab (T) to the contact area (C2) may be smaller than or equal to the second longitudinal distance (D2) between the end of the second side of the first side (E1) of each electrode tab (T) and the end of the second side of the second side (E2).

[0073] In one embodiment, the laser irradiation unit (200) can irradiate a laser onto the notching area (R1) to form a plurality of electrode tabs (T) on the unlit area (54).

[0074] The plurality of electrode tabs (T) can be spaced apart from each other in the longitudinal direction.

[0075] The plurality of electrode tabs (T) can each protrude toward the first side.

[0076] The above plurality of electrode tabs (T) may have a constant shape and size.

[0077] Each of the above electrode tabs (T) may have a first side (E1) and a second side (E2).

[0078] The first side (E1) and the second side (E2) can be extended to the first side or the second side.

[0079] The first side (E1) of each of the above electrode tabs (T) may be located upstream of the second side (E2) in the transfer direction.

[0080] The above one or more tension rollers may include a second tension roller (322).

[0081] The second tension roller (322) can be positioned downstream of the notching area (R1) in the conveying direction.

[0082] The above-mentioned non-removable portion (54) may have a contact portion (C2) that contacts the second tension roller (322).

[0083] The third longitudinal distance (D3) from the second notching point (N2) within the notching area (R1) forming any point on the first side (E1) of each electrode tab (T) to the contact area (C2) may be smaller than or equal to the fourth longitudinal distance (D4) between the arbitrary point on the first side (E1) of each electrode tab (T) and a predetermined point on the second side (E2) corresponding to the arbitrary point in the width direction.

[0084] In one embodiment, the electrode notching device (10) may further include one or more tension control units (330).

[0085] The above one or more tension control units (330) can move at least some of the tension rollers to one side or the other side in the thickness direction of the electrode sheet (50).

[0086] In one embodiment, at least some of the tension rollers that move to one side or the other side in the thickness direction by the one or more tension control units (330) may be positioned upstream of the notching area (R1) in the conveying direction.

[0087] In one embodiment, the one or more tension rollers may include a first tension roller (312) and a third tension roller (314), or a second tension roller (322) and a fourth tension roller (324).

[0088] The first tension roller (312) can be positioned upstream of the notching area (R1) in the conveying direction.

[0089] The third tension roller (314) can be positioned upstream of the first tension roller (312) in the conveying direction.

[0090] The third tension roller (314) can be positioned adjacent to the first tension roller (312).

[0091] The second tension roller (322) can be positioned downstream of the notching area (R1) in the conveying direction.

[0092] The fourth tension roller (324) can be positioned downstream of the second tension roller (322) in the conveying direction.

[0093] The fourth tension roller (324) can be positioned adjacent to the second tension roller (322).

[0094] The first tension roller (312) and the third tension roller (314) can come into contact with opposite sides of the electrode sheet (50).

[0095] The second tension roller (322) and the fourth tension roller (324) can come into contact with opposite sides of the electrode sheet (50).

[0096] In the case where the above one or more tension rollers include the first tension roller (312) and the third tension roller (314), at least one tension control unit (330) can move the third tension roller (314) relative to the first tension roller (312) to one side or the other side in the thickness direction.

[0097] Alternatively, if the above one or more tension rollers include the second tension roller (322) and the fourth tension roller (324), at least one tension control unit (330) can move the fourth tension roller (324) relative to the second tension roller (322) to one side or the other side in the thickness direction.

[0098] In one embodiment, the one or more tension control units (330) may include one or more sensors (338) and one or more control units (339).

[0099] The above one or more sensors (338) can measure the pressure acting on the above one or more tension rollers.

[0100] The above one or more control units (339) can move the above one or more tension rollers to one side or the other side in the thickness direction based on information measured by the above one or more sensors (338).

[0101] In one embodiment, the one or more tension control units (330) may include one or more cylinders (332) and one or more pistons (334).

[0102] One or more cylinders (332) may each have a hollow.

[0103] One or more pistons (334) can be inserted and installed in one or more cylinders (332).

[0104] The above one or more pistons (334) may be inserted and installed so as to be movable to one side or the other side in the thickness direction according to the internal pressure of the above one or more cylinders (332).

[0105] One or more of the above tension rollers can be rotatably coupled to one or more pistons (334).

[0106] The above one or more sensors (338) can measure the internal pressure of the above one or more cylinders (332).

[0107] The above one or more control units (339) can increase or decrease the internal pressure of the above one or more cylinders (332) based on information measured by the above one or more sensors (338).

[0108] In one embodiment, the electrode notching device (10) may further include a beam damper (830) and a foreign object catcher (630).

[0109] The beam damper (830) can be positioned facing the laser irradiation unit (200) with the notching area (R1) in between.

[0110] The above beam damper (830) can absorb the laser.

[0111] The above foreign matter receiving device (630) may be positioned below the beam damper (830) and the notching area (R1).

[0112] The above foreign matter receiving device (630) can be positioned facing the beam damper (830) and the notching area (R1) in the vertical direction.

[0113] The above foreign matter collector (630) can collect foreign matter.

[0114] In one embodiment, the electrode notching device (10) may further include a first injection part (710).

[0115] The first injection part (710) above may be positioned on the second side rather than the notching area (R1).

[0116] The first injection part (710) can be positioned to face the retaining part (52) and the electrode sheet (50) in the thickness direction.

[0117] The first injection unit (710) above can inject gas toward the first side.

[0118] In one embodiment, the one or more tension rollers may include a first tension roller (312) and a second tension roller (322).

[0119] The first tension roller (312) and the second tension roller (322) can be positioned upstream and downstream of the notching area (R1), respectively, in the conveying direction.

[0120] The first injection unit (710) can be positioned between the first tension roller (312) and the second tension roller (322).

[0121] The first injection unit (710) may be adjacent to the first tension roller (312) and the second tension roller (322) in the longitudinal direction.

[0122] The first injection part (710) may be adjacent to the retaining part (52) in the thickness direction.

[0123] In one embodiment, the electrode notching device (10) may further include a suction part (610).

[0124] The suction part (610) may be positioned on the first side rather than the notching area (R1).

[0125] The suction part (610) may be positioned to face the notching area (R1) and the first injection part (710) in the width direction.

[0126] The above suction part (610) can suck in foreign matter.

[0127] In one embodiment, the electrode notching device (10) may further include a first cover (810).

[0128] The first cover (810) can be positioned on one side of the electrode sheet (50) in the first direction.

[0129] The first direction above may correspond to the thickness direction of the electrode sheet (50) in the notching area (R1).

[0130] The first cover (810) can surround the notching area (R1).

[0131] The suction part (610) may be disposed on the first side of the first cover (810), and the first injection part (710) may be disposed on the second side.

[0132] In one embodiment, the electrode notching device (10) may further include a second cover (820), a suction part (610), and a second injection part (720).

[0133] The second cover (820) can be positioned on the other side of the electrode sheet (50) in the first direction.

[0134] The first direction above may correspond to the thickness direction of the electrode sheet (50) in the notching area (R1).

[0135] The second cover (820) can surround the notching area (R1).

[0136] The suction part (610) may be positioned on the first side rather than the notching area (R1).

[0137] The above suction part (610) can be placed on the first side of the second cover (820).

[0138] The above suction part (610) can suck in foreign matter.

[0139] The second injection unit (720) can be positioned on the second side of the second cover (820).

[0140] The second injection unit (720) above can inject gas toward the first side.

[0141] The second cover (820) may have a cover inclined surface (I) that is inclined downward toward the first side.

[0142] In one embodiment, the electrode notching device (10) may further include a third injection part (730).

[0143] The third injection unit (730) can inject gas onto the electrode sheet (50) that passes through the notching area (R1) and one or more tension rollers.

[0144] In one embodiment, the electrode notching device (10) may further include an adsorption belt (840) and a discharge section (620).

[0145] The above adsorption belt (840) may be positioned below the notching area (R1) and one or more tension rollers.

[0146] The above adsorption belt (840) can adsorb the scrap cut from the above uncut section (54) and transport it downward.

[0147] The discharge section (620) may be positioned below the adsorption belt (840).

[0148] The above discharge unit (620) can suck up the scrap transported by the above adsorption belt (840).

[0149] In one embodiment, the electrode notching device (10) may further include an auxiliary support member (500).

[0150] The above auxiliary support member (500) may be placed on the first or second side of the above notching area (R1).

[0151] The above auxiliary support member (500) can be positioned adjacent to the above notching area (R1).

[0152] The above auxiliary support member (500) can come into contact with the electrode sheet (50).

[0153] In one embodiment, the one or more tension rollers may include a first tension roller (312) and a second tension roller (322).

[0154] The first tension roller (312) and the second tension roller (322) can be positioned upstream and downstream of the notching area (R1), respectively, in the conveying direction.

[0155] The above transfer unit (100) may include a first transfer roller (110) and a second transfer roller (120).

[0156] The first transfer roller (110) can be positioned upstream of the first tension roller (312) in the transfer direction.

[0157] The first transfer roller (110) can come into contact with at least the central portion in the width direction of the electrode sheet (50).

[0158] The second transfer roller (120) can be positioned downstream of the second tension roller (322) in the transfer direction.

[0159] The second transfer roller (120) can come into contact with at least the central portion in the width direction of the electrode sheet (50).

[0160] The fifth distance (D5) between the first transfer roller (110) and the second transfer roller (120) may be 10 times or less the sixth distance (D6) in the longitudinal direction between a pair of contact parts where the first tension roller (312) and the second tension roller (322) each contact the non-contact part (54).

[0161] According to embodiments of the present invention, when ripples exist on the electrode sheet (50) or when the travel direction (transport direction) or position of the electrode sheet (50) changes (e.g., in the width direction), not only the thin bare portion (54) but also the thick retaining portion (52) is frictionally rubbed against the first type roller (e.g., in the width direction), so the bare portion (54) can be protected. Accordingly, even if ripples exist on the electrode sheet (50) or the travel direction or position of the electrode sheet (50) changes, deformation or damage to the bare portion (54) can be reduced or prevented, and notching can be performed correctly and stably. Here, the travel direction or position of the electrode sheet (50) can change, for example, due to the ripples of the electrode sheet (50) or by correcting the meandering of the electrode sheet (50).

[0162] In addition, since the first type roller contacts the first end of the retaining portion (52), even if the retaining portion (52) is thicker than the unretained portion (54), the first type roller can stably apply tension to the unretained portion (54) along with the retaining portion (52). For example, the active material layer of the first end can be easily stretched toward the unretained portion (54), thereby reducing the thickness of the first end. Furthermore, since a separate member for applying tension to the retaining portion (52) during notching can be eliminated, the electrode notching device (10) can be implemented with a simple configuration at a low cost.

[0163] In addition, since tension is applied to the electrode sheet (50) by a rotating roller, the frictional force acting on the electrode sheet (50) can be reduced, thereby reducing or preventing deformation (e.g., wrinkles) and damage to the electrode sheet (50). Also, since the tension member (tension roller) that applies tension to the electrode sheet (50) rotates, foreign matter does not accumulate or stick to the tension member, so there is no need to clean the tension member (frequently). Accordingly, maintenance costs can be reduced.

[0164] According to embodiments of the present invention, even if there are ripples on the electrode sheet (50) or the travel direction or position of the electrode sheet (50) changes (e.g., in the width direction), sufficient tension can be applied to the electrode sheet (50) within the notching area (R1). Accordingly, notching can be performed correctly and stably.

[0165] According to embodiments of the present invention, the third tension roller (314) may be positioned sufficiently adjacent to the first tension roller (312), or the fourth tension roller (324) may be positioned sufficiently adjacent to the second tension roller (322). Accordingly, even if there are ripples on the electrode sheet (50) or if the driving direction or position of the electrode sheet (50) changes, sufficient tension can be applied to the electrode sheet (50) within the notching area (R1). Therefore, notching can be performed correctly and stably.

[0166] According to embodiments of the present invention, since the first type roller has a width-direction section (S) in which the diameter decreases as it moves toward the second side, deformation (e.g., wrinkles) and damage to the retaining portion (52) can be reduced or prevented (even if there is a ripple on the electrode sheet (50) or the driving direction or position of the electrode sheet (50) changes). In addition, even if the tension roller presses the retaining portion (52), which is thicker than the uncoated portion (54), together with the uncoated portion (54), the retaining portion (52) may not be deformed or damaged.

[0167] According to embodiments of the present invention, foreign matter may not be attached to or adhered to the tension roller. Accordingly, there is no need to clean the tension roller (frequently), and contamination of the electrode sheet (50) can be reduced or prevented.

[0168] According to embodiments of the present invention, the physical, chemical, and thermal resistance of the tension roller can be improved. In addition, since the tension roller becomes chemically inert, the attachment or adhesion of foreign matter can be effectively prevented.

[0169] According to embodiments of the present invention, even if the remaining sides excluding the first side (E1) of the electrode tab (T) are formed (notched) first and then the first side (E1) is formed (notched), sufficient tension can be applied to the electrode sheet (50) within the notching area (R1) when the first side (E1) is formed (notched). Accordingly, notching can be performed correctly and stably.

[0170] According to embodiments of the present invention, since the tension can be adjusted in real time according to the sway of the electrode sheet (50), sufficient, uniform, and stable tension can be applied to the electrode sheet (50) within the notching area (R1).

[0171] According to embodiments of the present invention, even if the third or fourth tension roller (314, 324) moves to one side or the other in the thickness direction to adjust the tension, the position of the electrode sheet (50) (thickness direction, first direction) within the notching area (R1) may be fixed or not significantly changed. Accordingly, the laser focus position (distance) may be maintained or not significantly changed. Therefore, an electrode notching device in which the tension of the electrode sheet (50) within the notching area (R1) is adjusted can be implemented with a simple configuration at low cost.

[0172] According to embodiments of the present invention, the tension control unit (330) can be implemented with a simple configuration at low cost. In addition, even if excessive pressure is applied to the tension roller, the fluid (e.g., air) inside the cylinder (332) acts as a cushion, so damage to the electrode sheet (50) can be prevented.

[0173] According to embodiments of the present invention, foreign matter can be removed simply and effectively.

[0174] According to embodiments of the present invention, foreign substances such as fumes generated by laser notching are prevented from scattering toward the retaining part (52), thereby preventing contamination of the electrode sheet (50) by foreign substances. In addition, foreign substances can be prevented from accumulating or sticking to the tension roller. Accordingly, since there is no need to clean the tension member (frequently), maintenance costs can be reduced.

[0175] According to embodiments of the present invention, foreign matter can be effectively prevented from flowing toward the retaining part (52) through the space between the first tension roller (312) and the second tension roller (322). In addition, foreign matter can be effectively prevented from accumulating or adhering to the first tension roller (312) and the second tension roller (322).

[0176] According to embodiments of the present invention, the electrode sheet (50) can be stably separated into the electrode sheet (50) having the electrode tab (T) formed thereon and the scrap.

[0177] According to embodiments of the present invention, scrap can be effectively separated and discharged.

[0178] According to embodiments of the present invention, the electrode sheet (50) can be stably transported.

[0179] In addition to the effects described above, the specific effects of the present invention are described together with the specific details for implementing the invention below.

[0180] FIGS. 1 to 3 are perspective and side views of an electrode notching device according to one embodiment of the present invention.

[0181] Figures 4 and 5 are drawings with the blower and suction pipe removed from Figures 1 and 2.

[0182] FIGS. 6 to 8 are a perspective view and a front view with some components removed from FIGS. 4 and 5.

[0183] FIGS. 9 and FIGS. 10 are enlarged drawings of part A of FIG. 8, showing a front view and a side view with the laser irradiation unit removed.

[0184] Figure 11 is a drawing with the tension roller removed from Figure 9.

[0185] FIG. 12 is a cross-sectional view of the tension roller of FIG. 1 to FIG. 11.

[0186] FIG. 13 is a side view showing the electrode sheet, laser irradiation unit, and tension roller of FIG. 1 to 11.

[0187] FIGS. 14 and FIGS. 15 are drawings showing embodiments different from FIG. 13.

[0188] FIGS. 16 to 18 are schematic perspective views of an electrode notching device according to a second embodiment of the present invention.

[0189] FIGS. 19 to 21 are drawings in which some components of FIGS. 16 to 18 have been omitted.

[0190] FIGS. 22 and FIGS. 23 are a side view and a cross-sectional view showing the electrode sheet and the first and second transfer rollers of FIGS. 16 to 18 in FIGS. 19 to 21.

[0191] Fig. 24 is an enlarged view of a part of Fig. 23.

[0192] FIG. 25 is a cross-sectional view of FIG. 22 at 25-25'.

[0193] Fig. 26 is a cross-sectional view of Fig. 22 at 26-26'.

[0194] Figure 27 is a drawing with a suction part added to Figure 26.

[0195] [Explanation of the symbol]

[0196] 10: Electrode notching device

[0197] 50: Electrode sheet

[0198] 52: Maintenance Division 54: Non-maintenance Division

[0199] T: Electrode tab

[0200] E1: 1st variation E2: 2nd variation

[0201] 100: Transfer section

[0202] 110: 1st transfer roller 120: 2nd transfer roller

[0203] 200: Laser Irradiation Unit

[0204] R1: Notching area R2: Adjacent area

[0205] N1: 1st notching point N2: 2nd notching point

[0206] 302: Main body 304: Coating layer

[0207] 310: 1st Support Section

[0208] 312: 1st tension roller 314: 3rd tension roller

[0209] 320: 2nd Support Unit

[0210] 322: 2nd tension roller 324: 4th tension roller

[0211] S: Section

[0212] C1: First contact area C2: Second contact area

[0213] C3: Third contact point C4: Fourth contact point

[0214] B1: 1st interval B2: 2nd interval

[0215] D1: 1st Street D2: 2nd Street

[0216] D3: 3rd Intersection D4: 4th Intersection

[0217] 330: Tension control unit

[0218] 332: Cylinder 334: Piston

[0219] 336: Guide rail

[0220] 338: Sensor 339: Control unit

[0221] 500: Auxiliary support 510: Plate

[0222] 610: Intake section 620: Exhaust section

[0223] 630: Foreign object catcher

[0224] 710: First part

[0225] 720: Second participle 730: Third participle

[0226] 810: 1st cover 812: 1st penetration hole

[0227] 820: Second cover 822: Second penetration hole

[0228] I: Cover slope 830: Beam damper

[0229] 840: Suction belt 842: Through hole

[0230] D5: 5th intersection D6: 6th intersection

[0231] The aforementioned objectives, features, and advantages are described in detail below with reference to the attached drawings, thereby enabling those skilled in the art to easily implement the technical concept of the present invention. In describing the present invention, detailed descriptions of known technologies related to the present invention are omitted if it is determined that such descriptions would unnecessarily obscure the essence of the invention. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the attached drawings. In the drawings, the same reference numerals are used to indicate the same or similar components.

[0232] Although terms such as "first," "second," etc., are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used merely to distinguish one component from another, and unless specifically stated otherwise, the first component may also be the second component.

[0233] Throughout the specification, unless specifically stated otherwise, each component may be singular or plural.

[0234] In the following, the statement that any configuration is placed on the "upper (or lower)" of a component or on the "upper (or lower)" of a component may mean not only that any configuration is placed in contact with the upper (or lower) surface of said component, but also that another configuration may be interposed between said component and any configuration placed on (or below) said component.

[0235] In addition, where it is stated that one component is "connected," "combined," or "connected" to another component, it should be understood that while the components may be directly connected or connected to each other, another component may be "interposed" between each component, or each component may be "connected," "combined," or "connected" through another component.

[0236] Singular expressions used in this specification include plural expressions unless the context clearly indicates otherwise. In this application, terms such as "composed of" or "comprising" should not be interpreted as necessarily including all of the various components or steps described in the specification, and should be interpreted as meaning that some of the components or steps may be omitted or additional components or steps may be included.

[0237] FIGS. 1 to 3 are perspective and side views of an electrode notching device according to a first embodiment of the present invention. FIGS. 4 and 5 are drawings with the first injection unit and suction unit removed from FIGS. 1 and 2. FIGS. 6 to 8 are perspective and front views with some components removed from FIGS. 4 and 5. FIGS. 9 and 10 are enlarged views of part A of FIG. 8, with the laser irradiation unit removed, showing a front and side view. FIG. 11 is a drawing with the tension roller removed from FIG. 9. FIG. 12 is a cross-sectional view of the tension roller of FIGS. 1 to 11. FIG. 13 is a side view showing the electrode sheet, laser irradiation unit, and tension roller of FIGS. 1 to 11. FIGS. 14 and 15 are drawings showing embodiments different from FIG. 13. FIGS. 16 to 18 are schematic perspective views of an electrode notching device according to a second embodiment of the present invention. FIGS. 19 to 21 are drawings in which some components of FIGS. 16 to 18 are omitted. FIGS. 22 and 23 are a side view and a cross-sectional view, respectively, showing the electrode sheet and the first and second transfer rollers of FIGS. 16 to 18 in FIGS. 19 to 21. FIG. 24 is an enlarged view of a part of FIG. 23. FIG. 25 is a cross-sectional view of FIG. 22 at 25-25'. FIG. 26 is a cross-sectional view of FIG. 22 at 26-26'. FIG. 27 is a drawing in which a suction part is added to FIG. 26.

[0238] [First embodiment of the electrode notching device]

[0239] Referring to FIGS. 1 to 11, the electrode notching device (10) according to the first embodiment may include a conveying unit (100), a laser irradiation unit (200), and one or more tension rollers. The electrode notching device (10) according to the first embodiment may further include one or more of a meandering correction roller (not shown), a suction unit (610), a discharge unit (620), a foreign matter receiving unit (630), a first spraying unit (710), a beam damper (830), and an adsorption belt (840).

[0240] [Transfer Unit, Laser Irradiation Unit]

[0241] The transfer unit (100) can transfer the electrode sheet (50) in a transfer direction. Here, the transfer direction may be parallel to the longitudinal direction. The longitudinal direction may be the longitudinal direction of the electrode sheet (50).

[0242] Here, the electrode sheet (50) may include a retaining portion (52) and a non-retaining portion (54). The retaining portion (52) may be an area where an active material is applied to the electrode current collector. The non-retaining portion (54) may be located on the first side in the width direction of the retaining portion (52). Here, the width direction may be the width direction of the electrode sheet (50). The non-retaining portion (54) may be an area where an active material is not applied to the electrode current collector.

[0243] The transfer unit (100) may include a first transfer roller (110) and a second transfer roller (120).

[0244] The first transfer roller (110) may be positioned upstream of the first tension roller (312) in the transfer direction. The first transfer roller (110) may come into contact with at least the central portion in the width direction of the electrode sheet (50).

[0245] The second transfer roller (120) may be positioned downstream of the second tension roller (322) in the transfer direction. The second transfer roller (120) may come into contact with at least the central portion in the width direction of the electrode sheet (50).

[0246] The fifth distance (D5) between the first transfer roller (110) and the second transfer roller (120) may be 10 times or less the sixth distance (D6) between a pair of contact areas (C1, C2) where the first tension roller (312) and the second tension roller (322) each contact the uncoated portion (54) (Figs. 8, Fig. 11). Accordingly, even if there is a ripple on the electrode sheet (50), a uniform and stable tension can be applied to the uncoated portion (54) within the notching area (R1).

[0247] Here, the first transfer roller (110), a pair of contact parts (C1, C2), and the second transfer roller (120) may be positioned in order in the second direction. The second direction may correspond to the transfer direction (e.g., up and down direction) of the electrode sheet (50) in the notching area (R1).

[0248] The laser irradiation unit (200) may be positioned on one side of the first direction relative to the notching area (R1). The first direction may correspond to the thickness direction of the electrode sheet (50) in the notching area (R1). The laser irradiation unit (200) may irradiate a laser onto the notching area (R1, FIG. 3, FIG. 7 to 11). The notching area (R1) may be an area through which the unlit area (54) passes.

[0249] The laser irradiation unit (200) can define a notching area (R1). For example, the position, width, etc. of the notching area (R1) may be limited by the laser irradiation angle, irradiation intensity, focal length, etc. of the laser irradiation unit (200).

[0250] The laser irradiation unit (200) can form a plurality of electrode tabs (T) in the unlit area (54) by irradiating a laser to the notching area (R1). For example, the laser irradiation unit (200) can form a plurality of electrode tabs (T) by repeatedly irradiating a laser to a plurality of points forming a butterfly shape along the dotted arrow as shown in FIG. 11.

[0251] Multiple electrode tabs (T) may be spaced apart from each other in the longitudinal direction. Multiple electrode tabs (T) may each protrude toward the first side. Multiple electrode tabs (T) may have a constant shape and size. Each electrode tab (T) may have a first side (E1) and a second side (E2).

[0252] The first side (E1) and the second side (E2) may extend to the first side or the second side in the width direction. The first side (E1) and the second side (E2) may have corresponding positions at the ends of the second side in the width direction. Here, the second side may be opposite to the first side. In the transport direction, the first side (E1) may be located upstream of the second side (E2) (Fig. 11).

[0253] [One or more tension rollers]

[0254] One or more tension rollers may be positioned upstream or downstream of the notching area (R1) in the conveying direction, respectively. Each tension roller may be positioned adjacent to the notching area (R1). Each tension roller may apply tension to the unstained portion (54) within the notching area (R1) by contacting the unstained portion (54). Each tension roller may be formed to extend in the width direction.

[0255] One or more tension rollers can define a notching area (R1). This means that the area (notching area) where the laser irradiation unit (200) can stably notch the electrode sheet (50) is (directly) defined by one or more tension rollers that apply tension to the electrode sheet (50). For example, the position, size, etc. of the notching area (R1) may be limited by the position, etc. of one or more tension rollers.

[0256] Referring further to FIG. 12, at least some of the tension rollers may include a main body (302) and a coating layer (304). The coating layer (304) may cover the outer circumference of the main body (302). The coating layer (304) may be configured to reduce the adhesion of foreign matter compared to the main body (302).

[0257] Accordingly, foreign matter may not adhere to or stick to the tension roller. As a result, there is no need to clean the tension roller (frequently), and contamination of the electrode sheet (50) can be reduced or prevented.

[0258] The coating layer (304) can be formed from a material containing tantalum carbide (TaC).

[0259] Accordingly, the physical, chemical, and thermal resistance of the tension roller can be improved. In addition, since the tension roller becomes chemically inert, the attachment or adhesion of foreign matter can be effectively prevented.

[0260] At least some of the tension rollers may each be a first type roller. The first type roller may apply tension to the first end in the adjacent area (R2) by contacting the first end on the first side of the retaining part (52). That is, the first type roller may apply tension to the unsecured part (54) and the first end in the adjacent area (R2) by contacting the unsecured part (54) and the first end in the notching area (R1). Here, the adjacent area (R2) may be located on the second side of the notching area (R1) and may be an area through which the first end passes.

[0261] Accordingly, when ripples exist on the electrode sheet (50) or when the driving direction (transport direction) or position of the electrode sheet (50) changes (e.g., in the width direction), not only the thin bare portion (54) but also the thick retaining portion (52) is frictionally rubbed against the first type roller (e.g., in the width direction), so the bare portion (54) can be protected. Accordingly, even if ripples exist on the electrode sheet (50) or when the driving direction or position of the electrode sheet (50) changes, deformation or damage to the bare portion (54) can be reduced or prevented, and notching can be performed correctly and stably. Here, the driving direction or position of the electrode sheet (50) can change, for example, due to the ripples of the electrode sheet (50) or by correcting the meandering of the electrode sheet (50).

[0262] In addition, since the first type roller contacts the first end of the retaining portion (52), even if the retaining portion (52) is thicker than the unretained portion (54), the first type roller can stably apply tension to the unretained portion (54) along with the retaining portion (52). For example, the active material layer of the first end can be easily stretched toward the unretained portion (54), thereby reducing the thickness of the first end. Furthermore, since a separate member for applying tension to the retaining portion (52) during notching can be eliminated, the electrode notching device (10) can be implemented with a simple configuration at a low cost.

[0263] In addition, since tension is applied to the electrode sheet (50) by a rotating roller, the frictional force acting on the electrode sheet (50) can be reduced, thereby reducing or preventing deformation (e.g., wrinkles) and damage to the electrode sheet (50). Also, since the tension member (tension roller) that applies tension to the electrode sheet (50) rotates, foreign matter does not accumulate or stick to the tension member, so there is no need to clean the tension member (frequently). Accordingly, maintenance costs can be reduced.

[0264] The first type roller may have a width-direction section (S) in which the diameter decreases as it moves toward the second side (Fig. 9, Fig. 12).

[0265] Accordingly, deformation (e.g., wrinkles) and damage to the retaining portion (52) can be reduced or prevented (even if there are ripples on the electrode sheet (50) or if the driving direction or position of the electrode sheet (50) changes). In addition, even if the tension roller presses the retaining portion (52), which is thicker than the unworn portion (54), together with the unworn portion (54), the retaining portion (52) may not be deformed or damaged.

[0266] In the first embodiment, one or more tension rollers may include a first tension roller (312) and a second tension roller (322).

[0267] The first tension roller (312) may be positioned upstream of the notching area (R1) in the conveying direction. The first tension roller (312) may be a first type roller.

[0268] The second tension roller (322) may be positioned downstream of the notching area (R1) in the conveying direction. The second tension roller (322) may be a first type roller.

[0269] Accordingly, even if there are ripples on the electrode sheet (50) or the driving direction or position of the electrode sheet (50) changes, deformation or damage to the unworn portion (54) can be reduced or prevented, and notching can be performed correctly and stably.

[0270] In addition, since the first and second tension rollers (312, 322) are in contact with the first end of the retaining portion (52), even if the retaining portion (52) is thicker than the non-retaining portion (54), the first and second tension rollers (312, 322) can stably apply tension to the non-retaining portion (54) together with the retaining portion (52). In the second embodiment, one or more tension rollers may include the first tension roller (312) and the third tension roller (314).

[0271] The first tension roller (312) is as described above. The third tension roller (314) may be positioned upstream of the first tension roller (312) in the conveying direction. The third tension roller (314) may be positioned adjacent to the first tension roller (312). The first tension roller (312) and the third tension roller (314) may come into contact with opposite sides of the electrode sheet (50).

[0272] Accordingly, even if there are ripples on the electrode sheet (50) or the driving direction or position of the electrode sheet (50) changes (e.g., in the width direction), sufficient tension can be applied to the electrode sheet (50) within the notching area (R1). Accordingly, notching can be performed correctly and stably.

[0273] At this time, the third tension roller (314) may be a first type roller.

[0274] Accordingly, even if there are ripples on the electrode sheet (50) or the driving direction or position of the electrode sheet (50) changes, deformation or damage to the unworn portion (54) can be reduced or prevented.

[0275] The first longitudinal gap (B1, FIG. 10) between a pair of contact portions (C1, C3) where the first tension roller (312) and the third tension roller (314) each contact the non-contact portion (54) may be greater than 0 and smaller than the maximum longitudinal width of each electrode tab (T).

[0276] Accordingly, the third tension roller (314) can be positioned sufficiently adjacent to the first tension roller (312). Accordingly, even if there are ripples on the electrode sheet (50) or if the driving direction or position of the electrode sheet (50) changes, sufficient tension can be applied to the electrode sheet (50) within the notching area (R1). Therefore, notching can be performed correctly and stably.

[0277] In the third embodiment, one or more tension rollers may include a second tension roller (322) and a fourth tension roller (324).

[0278] The second tension roller (322) is as described above. The fourth tension roller (324) may be positioned downstream of the second tension roller (322) in the conveying direction. The fourth tension roller (324) may be positioned adjacent to the second tension roller (322). The second tension roller (322) and the fourth tension roller (324) may come into contact with opposite sides of the electrode sheet (50).

[0279] Accordingly, even if there are ripples on the electrode sheet (50) or the driving direction or position of the electrode sheet (50) changes (e.g., in the width direction), sufficient tension can be applied to the electrode sheet (50) within the notching area (R1). Accordingly, notching can be performed correctly and stably.

[0280] At this time, the fourth tension roller (324) may be a first type roller.

[0281] Accordingly, even if there are ripples on the electrode sheet (50) or the driving direction or position of the electrode sheet (50) changes, deformation or damage to the unworn portion (54) can be reduced or prevented.

[0282] The second longitudinal gap (B2, FIG. 10) between a pair of contact portions (C2, C4) where the second tension roller (322) and the fourth tension roller (324) each contact the non-contact portion (54) may be greater than 0 and smaller than the maximum longitudinal width of each electrode tab (T).

[0283] Accordingly, the fourth tension roller (324) can be positioned sufficiently adjacent to the second tension roller (322). Accordingly, even if there are ripples on the electrode sheet (50) or if the driving direction or position of the electrode sheet (50) changes, sufficient tension can be applied to the electrode sheet (50) within the notching area (R1). Therefore, notching can be performed correctly and stably.

[0284] In the fourth embodiment, one or more tension rollers may include a second tension roller (322). The second tension roller (322) may be positioned downstream of the notching area (R1) in the conveying direction. The unworn portion (54) may have a contact portion (C2) that contacts the second tension roller (320322).

[0285] At this time, the first longitudinal distance (D1) from the first notching point (N1) within the notching area (R1) forming the end of the second side of the first side (E1) of each electrode tab (T) to the contact area (C2) may be smaller than or equal to the second longitudinal distance (D2) between the end of the second side of the first side (E1) of each electrode tab (T) and the end of the second side of the second side (E2) (Fig. 11).

[0286] Accordingly, even if the remaining sides excluding the first side (E1) of the electrode tab (T) are formed (notched) first and then the first side (E1) is formed (notched), sufficient tension can be applied to the electrode sheet (50) when forming (notching) the first side (E1). Accordingly, notching can be performed correctly and stably.

[0287] In addition, at this time, the third longitudinal distance (D3) from the second notching point (N2) within the notching area (R1) forming an arbitrary point on the first side (E1) of each electrode tab (T) to the contact area (C2) may be smaller than or equal to the fourth longitudinal distance (D4) between the arbitrary point on the first side (E1) of each electrode tab (T) and a predetermined point on the second side (E2) corresponding to the arbitrary point in the width direction. Although this condition is not satisfied in FIG. 11, this condition may be satisfied if the width of the electrode tab (T) is sufficiently large.

[0288] Accordingly, even if the remaining sides excluding the first side (E1) of the electrode tab (T) are formed (notched) first, sufficient tension can be applied to the electrode sheet (50) when forming (notching) the first side (E1). Accordingly, notching can be performed correctly and stably.

[0289] Meanwhile, referring further to FIGS. 13 to 15, the first tension roller (312) and the second tension roller (322) may be placed together on one side (e.g., the front side) of the thickness direction (e.g., the front-back direction) of the electrode sheet (50) where the laser irradiation unit (200) is placed ( FIGS. 1 to 13), may be placed together on the other side (e.g., the rear side) of the thickness direction of the electrode sheet (50) ( FIG. 14), or may be placed on different sides of the thickness direction of the electrode sheet (50) ( FIG. 15). The placement of the third tension roller (314) and the fourth tension roller (324) may be determined by the placement of the first tension roller (312) and the second tension roller (322).

[0290] [Meandering correction roller, suction section, discharge section, foreign matter catcher, first injection section, beam damper and suction belt]

[0291] A meandering correction roller (not shown) may be positioned upstream of one or more tension rollers. The meandering correction roller may be tilted. The travel direction or position of the electrode sheet (50) may be changed (e.g., in the width direction) by the meandering correction roller. The meandering correction roller can correct the meandering of the electrode sheet (50).

[0292] The suction part (610) may be positioned on the first side of the notching area (R1). The suction part (610) may be positioned on the first side of the notching area (R1) in the width direction. The suction part (610) may be adjacent to the notching area (R1). The suction part (610) may have a tubular shape. The suction part (610) may be positioned to face the notching area (R1) and the first injection part (710) described later in the width direction (Figs. 1 to 3). The suction part (610) may suck in foreign matter.

[0293] Accordingly, foreign matter can be prevented from scattering toward the retaining part (52), thereby preventing contamination of the electrode sheet (50) by foreign matter. In addition, foreign matter can be prevented from accumulating or sticking to the tension roller.

[0294] The suction section (610) may be positioned to face one or more tension rollers in the width direction. The suction section (610) may be positioned to face a beam damper (830) and / or a suction belt (840) in the width direction. The suction section (610) may be opened to a second side.

[0295] The discharge section (620) may be positioned below the adsorption belt (840) described later. The discharge section (620) can suck up scrap transported by the adsorption belt (840) (Figs. 1 to 5). Accordingly, the scrap can be effectively separated and discharged.

[0296] The foreign matter collector (630) may be positioned below the beam damper (830) and the second tension roller (322) described later. The foreign matter collector (630) may be positioned facing the beam damper (830) and the notching area (R1) in the vertical direction (Figs. 1 to 5). The foreign matter collector (630) can collect foreign matter. Accordingly, foreign matter can be removed simply and effectively.

[0297] The foreign object catcher (630) can be positioned below one or more tension rollers.

[0298] The first injection part (710) may be positioned on one side in the thickness direction (first direction) of the electrode sheet (50). The first injection part (710) may be positioned to face the retaining part (52) in the thickness direction (e.g., first direction) of the electrode sheet (50). The first injection part (710) may be positioned adjacent to the notching area (R1).

[0299] The first injection unit (710) may be positioned on the second side relative to the notching area (R1). In the width direction, the first injection unit (710) may face the suction unit (610) with the notching area (R1) in between. The first injection unit (710) may inject gas toward the first side (Figs. 1 to 3).

[0300] Accordingly, foreign substances such as fumes generated by laser notching are prevented from scattering toward the retaining part (52), thereby preventing contamination of the electrode sheet (50) by foreign substances. In addition, foreign substances can be prevented from accumulating or sticking to one or more tension rollers. Accordingly, since there is no need to clean the tension member (frequently), maintenance costs can be reduced.

[0301] In the case where one or more tension rollers include a first tension roller (312) and a second tension roller (322) respectively positioned upstream and downstream of the notching area (R1) in the conveying direction, the first injection section (710) may be positioned between the first tension roller (312) and the second tension roller (322). The first injection section (710) may be adjacent to the first tension roller (312) and the second tension roller (322) in the longitudinal direction (e.g., the second direction). The first injection section (710) may be adjacent to the retaining section (52) in the thickness direction (e.g., the first direction) (Fig. 3).

[0302] Accordingly, it is possible to effectively prevent foreign matter from flowing into the retaining part (52) through the space between the first tension roller (312) and the second tension roller (322). In addition, it is possible to effectively prevent foreign matter from accumulating or sticking to the first tension roller (312) and the second tension roller (322).

[0303] The beam damper (830) may be positioned facing the laser irradiation unit (200) with the notching area (R1) in between. The beam damper (830) may absorb the laser (Figs. 1 to 5). The beam damper (830) may be equipped with a heat dissipation structure or a heat dissipation means.

[0304] The adsorption belt (840) may have a closed-loop shape. The adsorption belt (840) may be positioned downstream of the notching area (R1) and one or more tension rollers in the conveying direction. The adsorption belt (840) may be positioned below the notching area (R1) and one or more tension rollers.

[0305] The suction belt (840) may include a plurality of through holes (842, FIG. 1). The plurality of through holes (842) may penetrate the suction belt (840) in the thickness direction of the suction belt (840). Negative pressure may be provided to the plurality of through holes (842).

[0306] The suction belt (840) can move in a circular motion. The suction belt (840) can adsorb the scrap cut from the uncut section (54) and transport it downwards (Figs. 1 to 5).

[0307] [Second Embodiment of Electrode Notching Device]

[0308] Referring to FIGS. 16 to 27, the electrode notching device (10) according to the second embodiment may include a transfer unit (100), a laser irradiation unit (200), and one or more tension rollers, similar to the electrode notching device (10) according to the first embodiment described above. The electrode notching device (10) according to the second embodiment may include one or more tension control units (330). The electrode notching device (10) according to the second embodiment may include one or more of an auxiliary support unit (500), a suction unit (610), a discharge unit (620), a first injection unit (710), a second injection unit (720), a third injection unit (730), a first cover (810), a second cover (820), a beam damper (830), and an adsorption belt (840). Below, we will examine the differences from the electrode notching device (10) according to the first embodiment.

[0309] One or more tension control units (330) can move at least some of the tension rollers (e.g., third and fourth tension rollers (314, 324)) to one side or the other in the thickness direction (e.g., first direction) of the electrode sheet (50).

[0310] Accordingly, since the tension can be adjusted according to the wavy state of the electrode sheet (50), sufficient, uniform, and stable tension can be applied to the electrode sheet (50) within the notching area (R1).

[0311] At least some of the tension rollers that move to one side or the other in the thickness direction by one or more tension control units (330) (e.g., third and fourth tension rollers (314, 324)) may be first type rollers.

[0312] At least one of the tension rollers (e.g., the third tension roller (314)) that moves to one side or the other in the thickness direction by one or more tension control units (330) may be positioned upstream of the notching area (R1) in the conveying direction.

[0313] Accordingly, the tension can be stably controlled. This is because the tension-adjustable tension roller comes into contact with the electrode sheet (50) on which the electrode tab (T) is formed and the electrode sheet (50) before it is separated into scrap.

[0314] In the case where one or more tension rollers include a first tension roller (312) and a third tension roller (314), at least one tension control unit (330) can move the third tension roller (314) relative to the first tension roller (312) in one or the other direction in the thickness direction. Alternatively, in the case where one or more tension rollers include a second tension roller (322) and a fourth tension roller (324), at least one tension control unit (330) can move the fourth tension roller (324) relative to the second tension roller (322) in one or the other direction in the thickness direction.

[0315] Accordingly, even if the third or fourth tension roller (314, 324) moves to one side or the other in the thickness direction to adjust the tension, the position of the electrode sheet (50) in the notching area (R1) (thickness direction, first direction) may be fixed or not significantly changed. Accordingly, the laser focus position (distance) may be maintained or not significantly changed. Therefore, an electrode notching device in which the tension of the electrode sheet (50) in the notching area (R1) is adjusted can be implemented with a simple configuration at a low cost.

[0316] One or more tension control units (330) may include one or more cylinders (332) and one or more pistons (334). One or more tension control units (330) may include one or more guide rails (336). One or more tension control units (330) may include one or more sensors (338). One or more tension control units (330) may include one or more control units (339).

[0317] Each cylinder (332) can have a hollow space.

[0318] One or more pistons (334) may be inserted and installed in one or more cylinders (332). One or more pistons (334) may be installed to be movable to one side or the other side in the thickness direction (first direction) of the electrode sheet (50) according to the internal pressure of one or more cylinders (332). One or more tension rollers may be rotatably coupled to one or more pistons (334).

[0319] One or more guide rails (336) may be formed to extend to one side or the other in the thickness direction (first direction) of the electrode sheet (50). One or more pistons (334) may be coupled to one or more guide rails (336) so as to be movable to one side or the other in the thickness direction (first direction) of the electrode sheet (50).

[0320] One or more sensors (338) may be pressure sensors. One or more sensors (338) may measure the pressure acting on one or more tension rollers.

[0321] In one embodiment, one or more sensors (338) may be installed in the internal space of one or more cylinders (332) or installed at a location adjacent to the internal space. One or more sensors (338) may measure the internal pressure of one or more cylinders (332). The internal pressure of one or more cylinders (332) may correspond to the pressure acting on one or more tension rollers.

[0322] One or more control units (339) can move one or more tension rollers to one side or the other side in the thickness direction (first direction) of the electrode sheet (50) based on information measured by one or more sensors (338).

[0323] Accordingly, the tension can be adjusted in real time according to the condition of the electrode sheet (50), such as ripples. Accordingly, sufficient, uniform, and stable tension can be applied to the electrode sheet (50) within the notching area (R1).

[0324] In one embodiment, one or more control units (339) can move one or more tension rollers to one side or the other side in the thickness direction (first direction) of the electrode sheet (50) by increasing or decreasing the internal pressure of one or more cylinders (332) based on information measured by one or more sensors (338).

[0325] Accordingly, the tension control unit (330) can be implemented with a low-cost and simple configuration. In addition, even if excessive pressure is applied to the tension roller, the fluid (e.g., air) inside the cylinder (332) acts as a cushion, so damage to the electrode sheet (50) can be prevented.

[0326] Specifically, for example, one or more control units (339) may include one or more fluid supply units and one or more controllers. The control unit (339) may include one or more fluid discharge units.

[0327] One or more fluid supply units and one or more fluid discharge units may be in communication with the interior of one or more cylinders (322). One or more fluid supply units may increase the internal pressure of one or more cylinders (322) by supplying fluid (e.g., gas) into one or more cylinders (322). One or more fluid discharge units may decrease the internal pressure of one or more cylinders (322) by discharging fluid (e.g., gas) from inside one or more cylinders (322) to the outside. One or more fluid supply units and one or more fluid discharge units may be pumps. One or more fluid supply units and one or more fluid discharge units may be independent of each other or formed integrally.

[0328] One or more controllers may be connected to one or more sensors (338) and one or more fluid supply units. One or more controllers may be connected to one or more fluid discharge units. One or more controllers may control one or more fluid supply units and / or one or more fluid discharge units based on information measured by one or more sensors (338).

[0329] For example, the controller can control the fluid supply unit to supply fluid into the cylinder (322) if the measured value of the sensor (338) is smaller than a set value stored in the controller. Accordingly, the internal pressure of the cylinder (322) increases, causing the tension roller to move to one side in the thickness direction (first direction) of the electrode sheet (50) and the tension acting on the electrode sheet (50) may increase. The controller can control the fluid discharge unit to discharge the fluid inside the cylinder (322) to the outside if the measured value is larger than the set value. Accordingly, the internal pressure of the cylinder (322) decreases, causing the tension roller to move to the other side in the thickness direction (first direction) of the electrode sheet (50) and the tension acting on the electrode sheet (50) may decrease.

[0330] Meanwhile, the tension control unit (330) is not limited to the configuration described above. For example, the tension control unit (330) may include a servo motor and a ball screw instead of a cylinder (332) and a piston (334). In this case, the sensor (338) may be a load sensor.

[0331] The auxiliary support member (500) may be positioned on the first or second side of the notching area (R1). For example, at least a portion of the auxiliary support member (500) may be positioned in the adjacent area (R2). The auxiliary support member (500) may be positioned adjacent to the notching area (R1). The auxiliary support member (500) may come into contact with the electrode sheet (50). Accordingly, the electrode sheet (50) can be transported stably.

[0332] The auxiliary support member (500) may be positioned between the first tension roller (312) and the second tension roller (322) in the conveying direction. The auxiliary support member (500) may be in surface contact with the retaining member (52). The auxiliary support member (500) may include a plate (510). The plate (510) may be in surface contact with the electrode sheet (50) or the retaining member (52) (Figs. 24, 25).

[0333] The second injection part (720) may be positioned on the other side of the electrode sheet (50) in the thickness direction (first direction). The second injection part (720) may be positioned to face the retaining part (52) and the electrode sheet (50) in the thickness direction (e.g., first direction). The second injection part (720) may be positioned adjacent to the notching area (R1).

[0334] The second injection unit (720) may be positioned on the second side of the notching area (R1). In the width direction, the second injection unit (720) may face the suction unit (610) with the notching area (R1) in between. The second injection unit (720) may inject gas toward the first side (Figs. 1 to 3).

[0335] The third injection unit (730) can inject gas onto the electrode sheet (50) that has passed through the notching area (R1) and one or more tension rollers. Accordingly, the electrode sheet (50) can be stably separated into the electrode sheet (50) with the electrode tab (T) formed and the scrap.

[0336] The first cover (810) may be placed on one side of the electrode sheet (50) in the thickness direction (first direction). The first cover (810) may surround the notching area (R1). The first cover (810) may surround the space on one side of the first direction of the notching area (R1). In one embodiment, the first cover (810) may have a 'U' shape.

[0337] The first cover (810) may face the notching area (R1) in a first direction. A first through hole (812) may be formed on one side of the first direction of the first cover (810) facing the notching area (R1). The first through hole (812) may face the laser irradiation unit (200). A laser may be irradiated onto the notching area (R1) through the first through hole (812).

[0338] The first cover (810) may be closed in a second direction. One or more tension rollers may be installed on one side and / or the other side of the second direction of the first cover (810). The first cover (810) may be open in the width direction.

[0339] A suction part (610) may be disposed on the first side of the first cover (810). A suction part (610) may be coupled to the first side of the first cover (810). The first side of the first cover (810) in the width direction may be blocked by the suction part (610). A first spray part (710) may be disposed on the second side of the first cover (810). Accordingly, scattering of foreign matter and contamination of the electrode sheet (50) can be prevented.

[0340] The second cover (820) may be placed on the other side of the electrode sheet (50) in the thickness direction (first direction). The second cover (820) may surround the notching area (R1). The second cover (820) may surround the space on the other side of the first direction of the notching area (R1). In one embodiment, the second cover (820) may have a 'U' shape.

[0341] The second cover (820) may face the notching area (R1) in the first direction. A second through hole (822) may be formed on the other side of the second cover (820) in the first direction facing the notching area (R1). The second through hole (822) may face the beam damper (830). The second through hole (822) may be blocked by the beam damper (830). A laser passing through the notching area (R1) may be irradiated onto the beam damper (830) through the second through hole (822).

[0342] The second cover (820) may be closed in the second direction. One or more tension rollers may be installed on one side and / or the other side of the second direction of the second cover (820). The second cover (820) may be open in the width direction.

[0343] A suction part (610) may be disposed on the first side of the second cover (820). A suction part (610) may be coupled to the first side of the second cover (820). The first side of the second cover (820) in the width direction may be blocked by the suction part (610). A second injection part (720) may be disposed on the second side of the second cover (820).

[0344] At this time, the second cover (820) may be provided with a cover inclined surface (I). The cover inclined surface (I) may be inclined downward obliquely toward the first side. Accordingly, scattering of foreign matter and contamination of the electrode sheet (50) can be effectively prevented.

[0345] The second cover (820) may face the first cover (810) with the notching area (R1) and the electrode sheet (50) in between.

[0346] Meanwhile, matters not mentioned in relation to the electrode notching device (10) according to the second embodiment can be inferred from the electrode notching device (10) according to the first embodiment described above.

[0347] The embodiments described above should be understood as exemplary in all respects and not limiting, and the scope of the invention will be defined by the claims set forth below rather than by the detailed description above. Furthermore, the meaning and scope of the claims set forth below, as well as all modifications and variations derived from equivalents thereof, should be interpreted as being included within the scope of the invention.

[0348] Although the present invention has been described above with reference to the illustrated drawings, the present invention is not limited by the embodiments and drawings disclosed in this specification, and it is obvious that various modifications can be made by a person skilled in the art within the scope of the technical concept of the present invention. Furthermore, even if the effects of the configuration according to the present invention were not explicitly described while describing the embodiments of the present invention above, it is natural to acknowledge that the effects predictable by said configuration should also be recognized.

Claims

1. A transfer unit (100) that transfers an electrode sheet (50) comprising a retaining portion (52) which is an area coated with an active material and a non-retaining portion (54) which is an area not coated with an active material and is located on the first side in the width direction relative to the retaining portion (52), in a transfer direction parallel to the length direction of the electrode sheet (50); A laser irradiation unit (200) that irradiates a laser into a notching area (R1) through which the above-mentioned non-removable portion (54) passes; and It includes one or more tension rollers that are respectively positioned upstream or downstream of the notching area (R1) in the above conveying direction, positioned adjacent to the notching area (R1), define the notching area (R1), and apply tension to the unoccupied portion (54) within the notching area (R1) in contact with the unoccupied portion (54). At least some of the tension rollers are first type rollers that apply tension to the first end in the adjacent area (R2) by contacting the first end of the first side of the retaining part (52). The above adjacent area (R2) is located on the second side in the width direction of the above notching area (R1) and is an area through which the first end passes. Electrode notching device.

2. In Claim 1, The above one or more tension rollers are each disposed upstream and downstream of the notching area (R1) in the conveying direction and include the first tension roller (312) and the second tension roller (322), which are the first type rollers, in an electrode notching device.

3. In Claim 1, The above one or more tension rollers include a first tension roller (312) and a third tension roller (314), or include a second tension roller (322) and a fourth tension roller (324). The first tension roller (312) is positioned upstream of the notching area (R1) in the conveying direction and is the first type roller, The third tension roller (314) is positioned upstream of the first tension roller (312) in the conveying direction and is positioned adjacent to the first tension roller (312). The second tension roller (322) is positioned downstream of the notching area (R1) in the conveying direction and is the first type roller, The fourth tension roller (324) is positioned downstream of the second tension roller (322) in the conveying direction, and is positioned adjacent to the second tension roller (322). The first tension roller (312) and the third tension roller (314) are in contact with opposite sides of the electrode sheet (50), and The second tension roller (322) and the fourth tension roller (324) are electrode notching devices that contact opposite sides of the electrode sheet (50).

4. In Claim 3, In the case where the above one or more tension rollers include the third tension roller (314), the third tension roller (314) is the first type roller, or An electrode notching device in which, when the above one or more tension rollers include the above fourth tension roller (324), the above fourth tension roller (324) is the above first type roller.

5. In Claim 3, The laser irradiation unit (200) irradiates a laser onto the notching area (R1) to form a plurality of electrode tabs (T) in the unlit area (54), and The plurality of electrode tabs (T) are spaced apart from each other in the longitudinal direction and each protrude toward the first side, having a constant shape and size. In the case where the above one or more tension rollers include the first tension roller (312) and the third tension roller (314), the first longitudinal gap (B1) between the pair of contact portions where the first tension roller (312) and the third tension roller (314) each contact the non-contact portion (54) is greater than 0 and smaller than the maximum longitudinal width of each electrode tab (T), or In the case where the above one or more tension rollers include the second tension roller (322) and the fourth tension roller (324), the second longitudinal gap (B2) between the pair of contact portions where the second tension roller (322) and the fourth tension roller (324) each contact the non-contact portion (54) is greater than 0 and smaller than the maximum longitudinal width of each electrode tab (T), electrode notching device.

6. In any one of claims 1 to 5, The above first type roller is an electrode notching device having a width direction section (S) in which the diameter decreases as it goes toward the second side.

7. In any one of claims 1 to 6, An electrode notching device comprising at least some of the above-mentioned tension rollers, the main body (302) and a coating layer (304) covering the outer circumference of the main body (302) and configured to reduce the attachment of foreign matter compared to the main body (302).

8. In Claim 1, The laser irradiation unit (200) irradiates a laser onto the notching area (R1) to form a plurality of electrode tabs (T) in the unlit area (54), and The plurality of electrode tabs (T) are spaced apart from each other in the longitudinal direction and each protrude toward the first side, having a constant shape and size. Each of the above electrode tabs (T) has a first side (E1) and a second side (E2) that extend to the first side or the second side and have positions of the ends of the second side corresponding to each other in the width direction, and The first side (E1) of each of the above electrode tabs (T) is located upstream of the second side (E2) in the direction of transport, and The above one or more tension rollers include a second tension roller (322) positioned downstream of the notching area (R1) in the conveying direction, and The above-mentioned non-removable portion (54) has a contact portion (C2) that contacts the second tension roller (322), and An electrode notching device, wherein the first longitudinal distance (D1) from the first notching point (N1) within the notching area (R1) forming the second end of the first side (E1) of each electrode tab (T) to the contact area (C2) is less than or equal to the second longitudinal distance (D2) between the second end of the second side (E1) of each electrode tab (T) and the second end of the second side (E2).

9. In Claim 1, The laser irradiation unit (200) irradiates a laser onto the notching area (R1) to form a plurality of electrode tabs (T) in the unlit area (54), and The plurality of electrode tabs (T) are spaced apart from each other in the longitudinal direction and each protrude toward the first side, having a constant shape and size. Each of the above electrode tabs (T) has a first side (E1) and a second side (E2) extending to the first side or the second side, and The first side (E1) of each of the above electrode tabs (T) is located upstream of the second side (E2) in the direction of transport, and The above one or more tension rollers include a second tension roller (322) positioned downstream of the notching area (R1) in the conveying direction, and The above-mentioned non-removable portion (54) has a contact portion (C2) that contacts the second tension roller (322), and An electrode notching device, wherein the third longitudinal distance (D3) from the second notching point (N2) within the notching area (R1) forming any point on the first side (E1) of each electrode tab (T) to the contact area (C2) is less than or equal to the fourth longitudinal distance (D4) between the arbitrary point on the first side (E1) of each electrode tab (T) and a predetermined point on the second side (E2) corresponding to the arbitrary point in the width direction.

10. In Claim 1, An electrode notching device further comprising one or more tension control units (330) that move at least some of the tension rollers to one side or the other side in the thickness direction of the electrode sheet (50).

11. In Claim 10, An electrode notching device in which at least a portion of the tension rollers, which are moved to one side or the other side in the thickness direction by the above one or more tension control units (330), are positioned upstream of the notching area (R1) in the conveying direction.

12. In claim 10 or claim 11, The above one or more tension rollers include a first tension roller (312) and a third tension roller (314), or include a second tension roller (322) and a fourth tension roller (324). The first tension roller (312) is positioned upstream of the notching area (R1) in the conveying direction, and The third tension roller (314) is positioned upstream of the first tension roller (312) in the conveying direction and is positioned adjacent to the first tension roller (312). The second tension roller (322) is positioned downstream of the notching area (R1) in the conveying direction, and The fourth tension roller (324) is positioned downstream of the second tension roller (322) in the conveying direction, and is positioned adjacent to the second tension roller (322). The first tension roller (312) and the third tension roller (314) are in contact with opposite sides of the electrode sheet (50), and The second tension roller (322) and the fourth tension roller (324) are in contact with opposite sides of the electrode sheet (50), and In the case where the above one or more tension rollers include the first tension roller (312) and the third tension roller (314), at least one tension adjustment unit (330) moves the third tension roller (314) relative to the first tension roller (312) to one side or the other side in the thickness direction, or In the case where the above one or more tension rollers include the second tension roller (322) and the fourth tension roller (324), at least one tension control unit (330) moves the fourth tension roller (324) relative to the second tension roller (322) to one side or the other side in the thickness direction, an electrode notching device.

13. In any one of claims 10 to 12, The electrode notching device comprises one or more tension control units (330), each comprising one or more sensors (338) for measuring pressure acting on one or more tension rollers, and one or more control units (339) for moving one or more tension rollers to one side or the other side in the thickness direction based on information measured by the one or more sensors (338).

14. In Claim 13, The above one or more tension adjustment units (330) include one or more cylinders (332) having a hollow space and one or more pistons (334) inserted and installed in the one or more cylinders (332) such that they can move to one side or the other side in the thickness direction according to the internal pressure of the one or more cylinders (332). One or more tension rollers are rotatably coupled to one or more pistons (334), and The above one or more sensors (338) measure the internal pressure of the above one or more cylinders (332), and The above one or more control units (339) increase or decrease the internal pressure of the above one or more cylinders (332) based on information measured by the above one or more sensors (338), an electrode notching device.

15. In any one of claims 1 to 14, A first injection unit (710) positioned on the second side rather than the notching area (R1), positioned to face the retaining part (52) and the electrode sheet (50) in the thickness direction, and injecting gas toward the first side; and An electrode notching device further comprising a suction part (610) that sucks in foreign matter, positioned on the first side above the notching area (R1) and facing the notching area (R1) and the first injection part (710) in the width direction.

16. In Claim 15, It further includes a first cover (810) that surrounds the notching region (R1) and is disposed on one side of the electrode sheet (50) in a first direction corresponding to the thickness direction of the electrode sheet (50) in the notching region (R1). An electrode notching device in which the suction part (610) is disposed on the first side of the first cover (810) and the first injection part (710) is disposed on the second side.

17. In any one of claims 1 to 14, A second cover (820) positioned on the other side of the electrode sheet (50) in a first direction corresponding to the thickness direction of the electrode sheet (50) in the notching area (R1) and surrounding the notching area (R1); A suction part (610) positioned on the first side above the notching area (R1) and positioned on the first side of the second cover (820) to suck up foreign matter; and It further includes a second injection unit (720) disposed on the second side of the second cover (820) and injecting gas toward the first side, The above second cover (820) is an electrode notching device having a cover inclined surface (I) that is inclined downward toward the first side.

18. In any one of claims 1 to 17, An electrode notching device further comprising a third injection unit (730) that injects gas onto the electrode sheet (50) passing through the notching area (R1) and passing through one or more tension rollers.

19. In any one of claims 1 to 18, An electrode notching device further comprising an auxiliary support member (500) disposed on the first or second side of the notching area (R1), disposed adjacent to the notching area (R1), and in contact with the electrode sheet (50).

20. In claim 1, claim 10 or claim 11, The above one or more tension rollers include a first tension roller (312) and a second tension roller (322) respectively positioned upstream and downstream of the notching area (R1) in the conveying direction, and The above transfer unit (100) includes a first transfer roller (110) positioned upstream of the first tension roller (312) in the transfer direction and in contact with at least the central portion in the width direction of the electrode sheet (50), and a second transfer roller (120) positioned downstream of the second tension roller (322) in the transfer direction and in contact with at least the central portion in the width direction of the electrode sheet (50). An electrode notching device in which the fifth distance (D5) between the first transfer roller (110) and the second transfer roller (120) is 10 times or less the sixth distance (D6) in the longitudinal direction between a pair of contact portions where the first tension roller (312) and the second tension roller (322) each contact the non-contact portion (54).

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