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KR-20260067756-A - SECONDARY BATTERY AND METHOD FOR MANUFACTURING SAME

KR20260067756AKR 20260067756 AKR20260067756 AKR 20260067756AKR-20260067756-A

Abstract

The present disclosure provides a secondary battery and a method for manufacturing a secondary battery. A secondary battery according to the present disclosure comprises an electrode assembly formed by stacking a first electrode, a separator, and a second electrode, a case for housing the electrode assembly, a vent plate for sealing an opening on one side of the case, and a first current collector plate interposed between the electrode assembly and the vent plate. The first electrode comprises a first composite portion in which a first active material is coated on a first substrate, a first uncoated portion in which the first substrate is exposed, and a first reinforcing material attached to at least a portion of the first uncoated portion. The first current collector plate may be joined to the tip of the first electrode.

Inventors

  • 조영재
  • 이정수
  • 강봉근
  • 김진환
  • 김영호
  • 송치훈
  • 임승만
  • 김정현
  • 권준환
  • 임종민

Assignees

  • 삼성에스디아이 주식회사

Dates

Publication Date
20260513
Application Date
20241106

Claims (20)

  1. An electrode assembly formed by stacking a first electrode, a separator, and a second electrode; A case for housing the above electrode assembly; A vent plate sealing one side opening of the above case; and A first current collector plate interposed between the electrode assembly and the vent plate; Includes, The first electrode above is, A first composite part coated with a first active material on a first substrate; A first unprotected portion in which the first substrate is exposed at the tip of the first electrode; and A first reinforcing material attached to at least a portion of the first unincorporated portion; Includes, The above first current collector plate is joined to the tip of the above first electrode, a secondary battery.
  2. In paragraph 1, A secondary battery in which the first composite part and the first non-composite part are parallel to each other.
  3. In paragraph 1, A secondary battery in which the tip of the first electrode comprises at least a portion of the first non-reinforcing portion or the first reinforcing material.
  4. In paragraph 1, A secondary battery having a tip thickness of 20 μm to 30 μm of the first electrode joined to the first current collector plate.
  5. In paragraph 1, A secondary battery in which the first reinforcing material is attached to at least a portion of the first unincorporated portion by ultrasonic welding.
  6. In paragraph 1, A secondary battery in which the length of the first reinforcing material is 70% to 100% of the length of the first unincorporated portion.
  7. In paragraph 1, The above first reinforcing material is a secondary battery attached to at least one side of the above first non-reinforcing portion.
  8. In paragraph 1, The above-mentioned first reinforcing material is a secondary battery having the same material as the above-mentioned first material.
  9. In paragraph 1, A secondary battery in which the length of the first unworn portion is 1% to 5% of the length of the first composite portion.
  10. In paragraph 1, The electrode assembly is formed by winding the first electrode, the separator, and the second electrode, and A secondary battery in which the first non-reinforcing portion and the first reinforcing material are disposed in the core portion of the electrode assembly.
  11. In paragraph 1, The second electrode above is, A second composite part coated with a second active material on the second substrate; A second non-exposed portion in which the above-mentioned second description is exposed; and A second reinforcing material attached to the second non-reinforcing portion above; Includes, A secondary battery further comprising a second current collector plate joined to the second non-reinforcing portion or the second reinforcing material.
  12. In Paragraph 11, The second current collector plate is a secondary battery arranged to face the first current collector plate with the electrode assembly in between inside the case.
  13. In paragraph 1, The electrode assembly housed inside the above case is a secondary battery impregnated with an electrolyte.
  14. A step of forming an electrode assembly by stacking a first electrode, a separator, and a second electrode; A step of inserting the above electrode assembly through an opening on one side of the case; A step of arranging a first current collector plate to be joined to the tip of the first electrode on one side of the electrode assembly; and A step of sealing one side opening of the above case with a vent plate; Includes, The first electrode above is, A first composite part coated with a first active material on a first substrate; A first unprotected portion in which the first substrate is exposed at the tip of the first electrode; and A first reinforcing material attached to at least a portion of the first unincorporated portion; A method for manufacturing a secondary battery comprising
  15. In Paragraph 14, The step of arranging a first current collector plate to be joined to the tip of the first electrode on one side of the electrode assembly is A step of arranging the first current collector plate so that the tip of the first electrode and the first current collector plate are vertically joined. A method for manufacturing a secondary battery comprising
  16. In Paragraph 14, A method for manufacturing a secondary battery in which the first composite part and the first non-composite part are parallel to each other.
  17. In Paragraph 14, The step of forming the above electrode assembly is, A method for manufacturing a secondary battery comprising the step of attaching the first reinforcing material to at least a portion of the first unincorporated portion by ultrasonic welding.
  18. In Paragraph 14, The step of forming the electrode assembly above A method for manufacturing a secondary battery comprising the step of attaching the first reinforcing material to at least one side of the first non-reinforcing portion.
  19. In Paragraph 14, The step of forming the electrode assembly includes the step of winding the stacked first electrode, the separator, and the second electrode. A method for manufacturing a secondary battery in which the first non-reinforcing portion and the first reinforcing material are disposed in the core portion of the electrode assembly.
  20. In Paragraph 14, A method for manufacturing a secondary battery, further comprising the step of injecting an electrolyte into the above case.

Description

Secondary Battery and Method for Manufacturing Same The present disclosure relates to a secondary battery and a method for manufacturing a secondary battery. Unlike primary batteries, which cannot be recharged, secondary batteries are batteries capable of both charging and discharging. Low-capacity secondary batteries are used in small portable electronic devices such as smartphones, feature phones, laptop computers, digital cameras, and camcorders, while high-capacity secondary batteries are widely used as power sources for motor drive systems and power storage batteries in hybrid and electric vehicles. Such secondary batteries include an electrode assembly consisting of a positive electrode and a negative electrode, a case housing the assembly, and electrode terminals connected to the electrode assembly. Although rechargeable batteries are used in various environments due to their excellent electrical characteristics, conventional small batteries have had limitations in terms of designable energy density. Since the amount of electrical energy that can be stored is limited relative to the size and weight of the battery, there is a gradually increasing demand for large batteries with higher energy density in applications such as electric vehicles. In order for ions to move smoothly within the battery and transfer electrical energy during the charging and discharging processes, the electrode assembly of the secondary battery must be sufficiently impregnated with the electrolyte. However, as the size of the electrode assembly increases to enhance energy density, the movement of the electrolyte becomes less efficient and takes a long time to impregnate, resulting in defects where the electrolyte is not impregnated within the electrode assembly. The presence of such unimpregnated areas shortens the battery's lifespan and leads to reduced battery performance due to energy loss and safety accidents. Therefore, it is necessary to secure means to enhance the safety of the electrode assembly to address this issue. The information described above disclosed in the background technology of this invention is intended only to enhance understanding of the background of the present invention and may therefore include information that does not constitute prior art. The following drawings attached to this specification illustrate preferred embodiments of the present invention and serve to further enhance understanding of the technical concept of the present invention together with the detailed description of the invention provided below; therefore, the present invention should not be interpreted as being limited only to the matters described in such drawings. FIG. 1 is a schematic diagram illustrating a secondary battery according to one embodiment of the present disclosure. FIG. 2 is a plan view showing the appearance of an electrode assembly according to one embodiment of the present disclosure when viewed in the direction of the winding axis. FIG. 3 is a plan view showing a first electrode of a secondary battery according to one embodiment of the present disclosure. FIG. 4 is a drawing illustrating a first electrode of a secondary battery according to one embodiment of the present disclosure. FIG. 5 is a diagram illustrating the process of injecting an electrolyte into a secondary battery according to one embodiment of the present disclosure. FIG. 6 is a cross-sectional view of an electrode assembly and a current collector plate according to one embodiment of the present disclosure. FIG. 7 is a cross-sectional view of a secondary battery according to one embodiment of the present disclosure. FIG. 8 is a flowchart illustrating an example of a method for manufacturing a secondary battery according to the present disclosure. Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings. Prior to this, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings. Instead, based on the principle that the inventor can appropriately define the concepts of terms to best describe their invention, they should be interpreted in a meaning and concept consistent with the technical spirit of the present invention. Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are merely some of the most preferred embodiments of the present invention and do not represent all of the technical spirit of the present invention. It should be understood that various equivalents and modifications capable of replacing them may exist at the time of filing this application. Additionally, as used herein, “comprise, include” and/or “comprising, including” specify the presence of the mentioned features, numbers, steps, actions, parts, elements, and/or groups thereof, and do not exclude the presence or addition of one or more other features, numbers, actions, parts, elem