CN-121989306-A - Apparatus for manufacturing secondary battery and electrode plate cutting device

Abstract

The present disclosure provides an apparatus and an electrode plate cutting device for manufacturing a secondary battery, which can prevent damage to a mixture portion or generation of foreign matters by enlarging a contact area of a lower cutter and an upper cutter, thereby reducing concentration of load. The apparatus includes a conveying part configured to move an electrode plate to be cut along a conveying path, a winding part configured to wind the cut electrode plate conveyed by the conveying part, and an electrode plate cutting device including an upper cutter installed above the conveying path of the electrode plate and a lower cutter installed below the conveying path of the electrode plate and configured to cut the electrode plate by a crossing motion with the upper cutter, the lower cutter including a flat supporting part configured to support the electrode plate and formed at an upper end portion of the lower cutter.

Inventors

• Quan Junhuan
• JIN ZHENHUAN
• Lin Zhongmen
• JIANG FENGXIN

Assignees

• 三星SDI株式会社

Dates

Publication Date

20260508

Application Date

20250710

Priority Date

20241106

Claims (20)

1. 1. An apparatus for manufacturing a secondary battery, comprising: a conveying section configured to move an electrode plate to be cut along a conveying path; a winding part configured to wind the cut electrode plate conveyed by the conveying part, and An electrode plate cutting device including an upper cutter mounted above the conveying path of the electrode plate and a lower cutter mounted below the conveying path of the electrode plate and configured to cut the electrode plate by a cross motion with the upper cutter, the lower cutter including a flat supporting portion configured to support the electrode plate and formed at an upper end portion of the lower cutter.
2. 2. The apparatus of claim 1, wherein the electrode plate cutting device further comprises a stripper installed on a side of the lower cutter to correspond to the upper cutter and to support the electrode plate when the electrode plate is cut, and an inner surface of the lower cutter is formed on a surface of the lower cutter facing the stripper to be perpendicular to the flat supporting portion.
3. 3. The apparatus of claim 2, wherein a curved surface that makes surface contact with a bottom surface of the electrode plate when the electrode plate is cut is formed between the flat supporting portion and the inner surface.
4. 4. A device according to claim 3, wherein: An outer surface parallel to the inner surface formed on a surface of the lower cutter opposite to the inner surface, and A second inclined surface inclined downward from the flat supporting portion toward the outer surface is formed between the flat supporting portion and the outer surface.
5. 5. The apparatus of claim 2, wherein a first inclined surface is formed between the flat supporting portion and the inner surface, the first inclined surface being inclined downward from the flat supporting portion toward the inner surface and making surface contact with the electrode plate when the electrode plate is cut.
6. 6. The apparatus of claim 5, wherein: An outer surface parallel to the inner surface formed on a surface of the lower cutter opposite to the inner surface, and A second inclined surface inclined downward from the flat supporting portion toward the outer surface is formed between the flat supporting portion and the outer surface.
7. 7. The apparatus of claim 1, wherein the upper cutter comprises a flat supporting portion formed on a bottom surface of the upper cutter, the flat supporting portion of the upper cutter supporting the electrode plate while making surface contact with an upper surface of the electrode plate when the electrode plate is cut.
8. 8. The apparatus of claim 7, wherein: An inner surface forming a right angle with the flat supporting portion of the upper cutter is formed on one side surface of the upper cutter, and A curved surface that makes surface contact with the electrode plate when the electrode plate is cut is formed between the flat supporting portion and the inner surface of the upper cutter.
9. 9. The apparatus of claim 7, wherein: An inner surface forming a right angle with the flat supporting portion of the upper cutter is formed on one side surface of the upper cutter, and A first inclined surface is formed between the flat supporting portion of the upper cutter and the inner surface, the first inclined surface being inclined upward from the flat supporting portion of the upper cutter toward the inner surface and making surface contact with the electrode plate when the electrode plate is cut.
10. 10. The apparatus of claim 9, wherein: an outer surface parallel to the inner surface is formed on a surface of the upper cutter opposite to the inner surface, and A second inclined surface is formed between the flat support portion and the outer surface of the upper cutter.
11. 11. An electrode plate cutting device, comprising: an upper cutter installed above a transfer path of the electrode plate moving along the transfer path; A lower cutter installed below the conveying path and configured to cut the electrode plate by a cross motion with the upper cutter, Wherein the lower cutter includes a flat supporting portion that makes surface contact with the electrode plate and supports the electrode plate when the electrode plate is cut.
12. 12. The electrode plate cutting device according to claim 11, further comprising a stripper installed on a side of the lower cutter to correspond to the upper cutter and to support the electrode plate when the electrode plate is cut, and an inner surface of the lower cutter is formed on a surface of the lower cutter facing the stripper to be perpendicular to the flat supporting portion.
13. 13. The electrode plate cutting device according to claim 12, wherein a curved surface that makes surface contact with a bottom surface of the electrode plate when the electrode plate is cut is formed between the flat supporting portion and the inner surface.
14. 14. The electrode plate cutting device according to claim 13, wherein: An outer surface parallel to the inner surface formed on a surface of the lower cutter opposite to the inner surface, and A second inclined surface inclined downward from the flat supporting portion toward the outer surface is formed between the flat supporting portion and the outer surface.
15. 15. The electrode plate cutting device according to claim 12, wherein a first inclined surface is formed between the flat supporting portion and the inner surface, the first inclined surface being inclined downward from the flat supporting portion toward the inner surface and making surface contact with the electrode plate when the electrode plate is cut.
16. 16. The electrode plate cutting device according to claim 15, wherein: An outer surface parallel to the inner surface formed on a surface of the lower cutter opposite to the inner surface, and A second inclined surface inclined downward from the flat supporting portion toward the outer surface is formed between the flat supporting portion and the outer surface.
17. 17. The electrode plate cutting device according to claim 11, wherein the upper cutter comprises a flat supporting portion formed on a bottom surface of the upper cutter, the flat supporting portion of the upper cutter supporting the electrode plate while making surface contact with an upper surface of the electrode plate when the electrode plate is cut.
18. 18. The electrode plate cutting device according to claim 17, wherein: An inner surface forming a right angle with the flat supporting portion of the upper cutter is formed on one side surface of the upper cutter, and A curved surface that makes surface contact with the electrode plate when the electrode plate is cut is formed between the flat supporting portion and the inner surface of the upper cutter.
19. 19. The electrode plate cutting device according to claim 17, wherein: An inner surface forming a right angle with the flat supporting portion of the upper cutter is formed on one side surface of the upper cutter, and A first inclined surface is formed between the flat supporting portion of the upper cutter and the inner surface, the first inclined surface being inclined upward from the flat supporting portion of the upper cutter toward the inner surface and making surface contact with the electrode plate when the electrode plate is cut.
20. 20. The electrode plate cutting device according to claim 19, wherein: an outer surface parallel to the inner surface is formed on a surface of the upper cutter opposite to the inner surface, and A second inclined surface is formed between the flat support portion and the outer surface of the upper cutter.

Description

Apparatus for manufacturing secondary battery and electrode plate cutting device Technical Field The present disclosure relates to a cutting device for cutting electrode plates of a secondary battery, and more particularly, to an apparatus for manufacturing a secondary battery and an electrode plate cutting device. Background Unlike primary batteries, which are not designed to be charged, secondary batteries are batteries that are designed to be discharged and recharged. The secondary battery may broadly include an electrode assembly including 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 electrode assemblies accommodated in the case include stacked electrode assemblies and electrode core electrode assemblies. The electrode core type electrode assembly is manufactured by winding continuously supplied electrode plates using a winding device. The winding device comprises an electrode plate cutting device. The electrode plate cutting device is a device for cutting electrode plates at intervals of a designed length, and includes an upper cutter and a lower cutter. However, the conventional electrode plate cutting device has a problem in that cracks may occur in the mixture layer of the electrode plate due to concentration of load transferred to the electrode plate when the electrode plate is cut. That is, when the electrode plate is cut, the upper cutter, the lower cutter, and the stripper simultaneously apply pressure to a partial region of the electrode plate, causing the electrode plate to generate cracks in the mixture layer due to stress concentration, and in severe cases, the crack portion may fall off and generate foreign materials. In particular, because the end point of the blade of the conventional under cutter is in point contact with the electrode plate, the probability of damaging the mixture layer due to the stress concentration described herein becomes higher. There is a need for a dicing key having a structure for dispersing a load applied to the surface of a mixture and preventing damage to the mixture layer when dicing an electrode sheet. The above information disclosed in this background section is for enhancement of understanding of the background of the disclosure and, therefore, it may contain information that does not form the related art (or prior art). Disclosure of Invention The present disclosure is directed to providing an apparatus for manufacturing a secondary battery and an electrode plate cutting device that can prevent damage to a mixture layer or generation of foreign materials by enlarging a contact area of a lower cutter and an upper cutter on an electrode plate to reduce load concentration when the electrode plate is cut. According to aspects of the present disclosure, there is provided an apparatus for manufacturing a secondary battery, including a conveying part configured to move an electrode plate to be cut along a conveying path, a winding part configured to wind the cut electrode plate conveyed by the conveying part, and an electrode plate cutting device including an upper cutter mounted above the conveying path of the electrode plate and a lower cutter mounted below the conveying path of the electrode plate and configured to cut the electrode plate by a cross motion with the upper cutter, the lower cutter including a flat supporting part configured to support the electrode plate and formed at an upper end portion of the lower cutter. According to another aspect of the present disclosure, there is provided an electrode plate cutting apparatus including an upper cutter mounted above a transfer path of an electrode plate moving along the transfer path, and a lower cutter mounted below the transfer path and configured to cut the electrode plate by a cross motion with the upper cutter, wherein the lower cutter includes a flat supporting portion that makes surface contact with the electrode plate and supports the electrode plate when the electrode plate is cut. Aspects and features of the present disclosure are not limited to those described herein, and other aspects and features not specifically mentioned will be apparent to those of skill in the art from the following description of the present disclosure. Drawings The following figures, which are attached to the present specification, illustrate embodiments of the present disclosure and, together with the detailed description of the disclosure, further describe aspects and features of the disclosure. Accordingly, the present disclosure should not be construed as limited to the accompanying drawings, wherein: Fig. 1 is a schematic view illustrating an electrode assembly of a secondary battery that may be manufactured using an apparatus for manufacturing a secondar