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EP-4468474-B1 - CYLINDRICAL-BATTERY BEADING DEVICE AND METHOD

EP4468474B1EP 4468474 B1EP4468474 B1EP 4468474B1EP-4468474-B1

Inventors

  • KIM, DO-HYUN
  • LEE, JUN-HO

Dates

Publication Date
20260513
Application Date
20231212

Claims (8)

  1. A cylindrical-battery beading device (10) that forms a beading portion (21) on the outer surface of the battery housing (20), the cylindrical-battery beading device (10) comprising: a device body (100) capable of moving forward or backward; a beading tool unit (200) comprising a beading knife (210) and a knife support block (220) to which the beading knife (210) is coupled, and coupled to the device body (100) so as to reciprocate relative to the device body (100); and a beading-pressure measurement unit (300) fixed to the device body (100) and configured to come into contact with the knife support block (220) and measure a force by which the knife support block (220) is pushed backward during the beading process, wherein the device body (100) comprises a guide rail (120, 121, 122) extending in a straight line, and wherein the knife support block (220) is configured to be slidably coupled to the guide rail (120, 121, 122) and move in a direction (+X) toward the beading-pressure measurement unit (300) or in the opposite direction (-X) thereof, wherein the device body (100) has a tool mounting portion (110) to and from which the beading tool unit (200) is attached and detached, and wherein the tool mounting portion (110) comprises: a bottom surface (111) on which the guide rail (120, 121, 122) is mounted; a first wall surface (112) facing one end of the guide rail (120, 121, 122) in the extension direction, intersecting the bottom surface (111), and having the beading-pressure measurement unit (300) fixed thereto; and a second wall surface (113) and a third wall surface (114) that are spaced apart from each other by the distance greater than the width of the knife support block (220) on the bottom surface (111), are parallel to the guide rail (120, 121, 122), and intersect the bottom surface (111), respectively, characterized in that the device body (100) comprises a spring damper (500) configured to protrude from the first wall surface (112) toward the knife support block (220) and restrict an abrupt movement of the knife support block (220).
  2. The cylindrical-battery beading device (10) according to claim 1, wherein the beading-pressure measurement unit (300) comprises a load cell fixed to the device body (100).
  3. The cylindrical-battery beading device (10) according to claim 1, wherein the knife support block (220) comprises a front block portion (221) facing the battery housing (20) and a rear block portion (223) facing the beading-pressure measurement unit (300) during the beading process, wherein the beading knife (210) is mounted to the front block portion (221), and wherein the rear block portion (223) comprises a rear block surface (224) facing the beading-pressure measurement unit (300), and a contact portion configured to protrude from the rear block surface (224) and come into contact with the beading-pressure measurement unit (300).
  4. The cylindrical-battery beading device (10) according to claim 1, wherein the beading knife (210) is rotatable and fixed to the knife support block (220).
  5. The cylindrical-battery beading device (10) according to claim 1, wherein the spring damper (500) comprises a first spring damper (510) and a second spring damper (520) protruding from the first wall surface (112) more than the beading-pressure measurement unit (300) on both sides of the beading-pressure measurement unit (300).
  6. The cylindrical-battery beading device (10) according to claim 1, further comprising a battery holding jig (400) configured to support the battery housing (20) such that the battery housing (20) is not pushed by the beading tool unit (200) during the beading process.
  7. The cylindrical-battery beading device (10) according to claim 6, wherein the battery holding jig (400) comprises: a battery holder (410) configured to partially accommodate and support the battery housing (20); and a holder flange configured to surround the outer circumference of the battery holder (410); and a bearing member interposed between the battery holder (410) and the holder flange, and wherein the battery holder (410) is configured to be rotatable.
  8. A cylindrical-battery beading method of forming a beading portion (21) on a battery housing (20) using the cylindrical-battery beading device (10) according to claim 1, the method comprising: moving the device body (100) forward toward the battery housing (20) such that the beading knife (210) comes into contact with the outer surface of the battery housing (20) and such that the knife support block (220) comes into contact with the beading-pressure measurement unit (300); moving the device body (100) forward such that the beading knife (210) presses the battery housing (20) and rotating the battery housing (20) to form a beading portion (21) along the circumferential direction of the battery housing (20); and measuring, using the beading-pressure measurement unit (300), a force by which the knife support block (220) is pushed back due to the repulsive force of the battery housing (20) in the process of forming the beading portion (21) on the battery housing (20).

Description

TECHNICAL FIELD The present disclosure relates to a cylindrical-battery beading device and a cylindrical-battery beading method. BACKGROUND ART Cylindrical batteries have a beading portion formed to be recessed inward by press at an end adjacent to the opening of a battery housing to prevent an electrode assembly inside the battery housing from moving up and down. Referring to FIG. 1, in the conventional beading device 1 for forming a beading portion, a device body to which a beading knife 2 is coupled moves forward toward the battery housing such that the battery housing and the beading knife 2 come into contact with each other, thereby performing a beading process. JP 2008 097885 A, which forms the basis for the preamble of claim 1, embodies a manufacturing method related to a grooving process for forming an annular groove on an outer peripheral surface near an opening end of a bottomed cylindrical battery case in a lithium secondary battery. CN208712601U relates to a a battery groove rolling machine. KR 2000 0018604A and KR 2006 0019770 A relate to beading devices for a secondary battery. Meanwhile, if the force applied to the battery housing is accurately recognized during the beading process, it is possible to predict the quality and properly regulate a drive motor. However, since the conventional beading device does not have a means to measure the force directly applied to the battery housing, the force applied to the battery housing is indirectly predicted by measuring the load of a drive motor (not shown) to drive the device body. However, the load of the drive motor may vary depending on various factors of the beading device, making it difficult to precisely measure the force directly applied to the battery housing. Therefore, a new cylindrical-battery beading device is required to be developed to solve the problems above. DISCLOSURE Technical Problem The present disclosure has been designed to solve the problems of the related art, and therefore the present disclosure is directed to providing a cylindrical-battery beading device and a cylindrical-battery beading method configured to precisely measure the force directly applied to the battery housing during the beading process. According to another aspect, the present disclosure enables prediction of the quality of the cylindrical battery by precisely measuring the force directly applied to the battery housing during the beading process. According to another aspect, the present disclosure measures the force directly applied to the battery housing during the beading process in real time, thereby reducing the probability of defects occurring or preventing defects from occurring during the beading process in the entire cylindrical-battery production process. However, the technical problems that the present disclosure seeks to solve are not limited to the above-mentioned problems, and other problems not mentioned above will be clearly understood by those skilled in the art from the description of the invention described below. Technical Solution According to one aspect of the present disclosure, there may be provided a cylindrical-battery beading device including: a device body capable of moving forward or backward; a beading tool unit including a beading knife and a knife support block to which the beading knife is coupled, and coupled to the device body so as to reciprocate relative to the device body; and a beading-pressure measurement unit fixed to the device body and configured to come into contact with the knife support block and measure a force by which the knife support block is pushed backward during a beading process. The beading-pressure measurement unit may include a load cell fixed to the device body. The device body includes a guide rail extending in a straight line, and the knife support block is configured to be slidably coupled to the guide rail and move in a direction toward the beading-pressure measurement unit or in the opposite direction thereof. The knife support block may include a front block portion facing the battery housing and a rear block portion facing the beading-pressure measurement unit during the beading process, and the beading knife may be mounted to the front block portion, and the rear block portion may include a rear block surface facing the beading-pressure measurement unit, and a contact portion configured to protrude from the rear block surface and come into contact with the beading-pressure measurement unit. The beading knife may be rotatable and fixed to the knife support block. The device body has a tool mounting portion to and from which the beading tool unit is attached and detached, and the tool mounting portion includes: a bottom surface on which the guide rail is mounted; a first wall surface facing one end of the guide rail in the extension direction, intersecting the bottom surface, and having the beading-pressure measurement unit fixed thereto; and a second wall surface and a third wall surface that