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EP-4741118-A1 - APPARATUS FOR MANUFACTURING SECONDARY BATTERY AND ELECTRODE PLATE CUTTING DEVICE FOR SECONDARY BATTERY

EP4741118A1EP 4741118 A1EP4741118 A1EP 4741118A1EP-4741118-A1

Abstract

An apparatus for manufacturing a secondary battery and an electrode plate cutting device that can prevent damage to a mixture portion or generation of foreign materials by expanding contact areas of a lower cutter and an upper cutter, thereby reducing concentration of a load. The apparatus includes a transfer part configured to move an electrode plate, which will be cut, along a transfer path, a winding part configured to wind the cut electrode plate transferred by the transfer part, and an electrode plate cutting device including an upper cutter installed above the transfer path of the electrode plate and a lower cutter installed below the electrode plate transfer path and cuts the electrode plate through cross motion with the upper cutter and in which a flat support portion configured to support the electrode plate is formed at an upper portion thereof.

Inventors

  • KWON, JUNHWAN
  • KIM, JINHWAN
  • Im, Jongmin
  • KANG, Bonggeun

Assignees

  • SAMSUNG SDI CO., LTD.

Dates

Publication Date
20260513
Application Date
20250703

Claims (10)

  1. An electrode plate cutting device for a secondary battery, comprising: an upper cutter installed above a transfer path of an electrode plate moved along a transfer path; and a lower cutter installed below the transfer path and configured to cut the electrode plate through cross motion with the upper cutter, wherein a flat support portion, which comes into surface contact with the electrode plate and supports the electrode plate when the electrode plate is cut, is formed in the lower cutter.
  2. The electrode plate cutting device as claimed in claim 1, wherein a stripper is installed on a side portion of the lower cutter to correspond to the upper cutter and configured to support the electrode plate when the electrode plate is cut, and wherein an inner surface of the lower cutter is formed on a surface facing the stripper of the lower cutter so as to be perpendicular to the flat support portion.
  3. The electrode plate cutting device as claimed in claim 2, wherein a curved surface, which comes into surface contact with a bottom surface of the electrode plate when the electrode plate is cut, is formed between the flat support portion and the inner surface of the lower cutter.
  4. The electrode plate cutting device as claimed in claim 2 or 3, wherein a first inclined surface, which is inclined downwardly from the flat support portion toward the inner surface and comes into surface contact with the electrode plate when the electrode plate is cut, is formed between the flat support portion and the inner surface.
  5. The electrode plate cutting device as claimed in claim 2, 3 or 4, wherein: an outer surface, which is parallel to the inner surface of the lower cutter, is formed on a surface opposite to the inner surface of the lower cutter; and an inclined surface, which is inclined downwardly from the flat support portion toward the outer surface, is formed between the flat support portion and the outer surface.
  6. The electrode plate cutting device as claimed in any preceding claim, wherein a flat support portion, which supports the electrode plate while in surface contact with an upper surface of the electrode plate when the electrode plate is cut, is formed on a bottom surface of the upper cutter.
  7. The electrode plate cutting device as claimed in claim 6, wherein: an inner surface, which forms a right angle with the flat support portion formed on the bottom surface of the upper cutter, is formed on one side surface of the upper cutter; and a curved surface, which comes into surface contact with the electrode plate when the electrode plate is cut, is formed between the flat support portion formed on the bottom surface of the upper cutter and the inner surface formed on the bottom surface of the upper cutter.
  8. The electrode plate cutting device as claimed in any one of claims 1 to 5, wherein: an inner surface, which forms a right angle with the flat support portion, is formed on one side surface of the upper cutter; and a first inclined surface, which is inclined upwardly from the flat support portion toward the inner surface and comes into surface contact with the electrode plate when the electrode plate is cut, is formed between the flat support portion and the inner surface.
  9. The electrode plate cutting device as claimed in claim 8, wherein: an outer surface, which is parallel to the inner surface, is formed on a surface opposite to the inner surface of the upper cutter; and a second inclined surface is further formed between the flat support portion and the outer surface.
  10. An apparatus for manufacturing a secondary battery, comprising: a transfer part configured to move an electrode plate, which will be cut, along a transfer path; a winding part configured to wind the cut electrode plate transferred by the transfer part; and the electrode plate cutting device according to any preceding claim.

Description

FIELD The present disclosure relates to a cutting device for cutting an electrode plate of a secondary battery, and more specifically, to an apparatus for manufacturing a secondary battery and an electrode plate cutting device for a secondary battery. BACKGROUND Different from primary batteries that are not designed to be charged, secondary batteries are designed to be discharged and recharged. A secondary battery may broadly include an electrode assembly consisting of a positive electrode plate, a separator, and a negative electrode plate, a case (or can) for accommodating the electrode assembly, a substrate tab formed by extending from an uncoated portion of each electrode plate of the electrode assembly, and an external terminal connected to the substrate tab. Types of the electrode assembly accommodated in the case include a stacked type electrode assembly and a jelly-roll type electrode assembly. The jelly-roll type electrode assembly is manufactured by winding an electrode plate, which is continuously supplied, using a winding device. The winding device includes an electrode plate cutting device. The electrode plate cutting device is a device for cutting the electrode plate at a designed length interval and includes an upper cutter and a lower cutter. However, the conventional electrode plate cutting device has a problem in that cracks occur in a mixture layer of the electrode plate due to concentration of a load transmitted to the electrode plate when the electrode plate is cut. That is, when the electrode plate is cut, an upper cutter, a lower cutter, and a stripper simultaneously apply pressure to a local region of the electrode plate, causing cracks in the mixture layer due to stress concentration, and in severe cases, cracked parts fall and generate foreign materials. In particular, since an end point of a blade of the conventional lower cutter is in point contact with the electrode plate, a probability of damage to the mixture layer due to the herein-described stress concentration becomes higher. A cutting key with a structure for distributing a load applied to a mixture surface when the electrode plate is cut and preventing damage to the mixture layer is required. The herein information disclosed in this Background section is for enhancement of understanding of the background of the present disclosure, and therefore, it may contain information that does not constitute a related (or prior) art. SUMMARY The present disclosure is directed to providing an apparatus for manufacturing a secondary battery and an electrode plate cutting device for a secondary battery that can prevent damage to a mixture layer or generation of foreign materials by expanding a contact area of a lower cutter and an upper cutter on an electrode plate to reduce concentration of a load when the electrode plate is cut. According to an aspect of the present disclosure, there is provided an apparatus for manufacturing a secondary battery, which includes a transfer part configured to move an electrode plate, which will be cut, along a transfer path, a winding part configured to wind the cut electrode plate transferred by the transfer part, and an electrode plate cutting device comprising an upper cutter installed above the transfer path of the electrode plate and a lower cutter installed below the electrode plate transfer path and cuts the electrode plate through cross motion with the upper cutter and in which a flat support portion configured to support the electrode plate is formed at an upper portion thereof. According to another aspect of the present disclosure, there is provided an electrode plate cutting device for a secondary battery, which includes an upper cutter installed above a transfer path of an electrode plate moved along a transfer path, and a lower cutter installed below the transfer path and configured to cut the electrode plate through cross motion with the upper cutter, wherein a flat support portion, which comes into surface contact with the electrode plate and supports the electrode plate when the electrode plate is cut, is formed in the lower cutter. A stripper may be installed on a side portion of the lower cutter to correspond to the upper cutter and configured to support the electrode plate when the electrode plate is cut, and an inner surface of the lower cutter may be formed on a surface facing the stripper of the lower cutter so as to be perpendicular to the flat support portion. A curved surface, which comes into surface contact with a bottom surface of the electrode plate when the electrode plate is cut, may be formed between the flat support portion and the inner surface of the lower cutter. A first inclined surface, which is inclined downwardly from the flat support portion toward the inner surface and comes into surface contact with the electrode plate when the electrode plate is cut, may be formed between the flat support portion and the inner surface. An outer surface, which is parallel to the