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KR-20260064097-A - SECONDARY BATTERY

KR20260064097AKR 20260064097 AKR20260064097 AKR 20260064097AKR-20260064097-A

Abstract

The present disclosure relates to a secondary battery, and the technical problem to be solved is to provide a secondary battery that reinforces a portion of an electrode assembly that is prone to damage when pressure is applied. To this end, the present disclosure provides a secondary battery comprising a plurality of first electrode plates and second electrode plates, an electrode assembly having a separator that is folded in a zigzag shape and interposed between the first electrode plates and the second electrode plates, a case that accommodates the electrode assembly, and an adhesive member provided on at least one side of the outer surface of the electrode assembly, wherein the electrode assembly includes a fusion region in which the outermost end region of the separator is fused, and the adhesive member is provided such that at least a portion of the fusion region is included.

Inventors

  • 이미선

Assignees

  • 삼성에스디아이 주식회사

Dates

Publication Date
20260507
Application Date
20241031

Claims (20)

  1. An electrode assembly having a plurality of first electrode plates and second electrode plates, and a separator that is folded in a zigzag shape and interposed between the first electrode plates and the second electrode plates; A case for housing the above electrode assembly; and It includes an adhesive member provided on at least one side of the outer surface of the electrode assembly, and The electrode assembly includes a fusion region where the outermost end region of the separator is fused, and A secondary battery, wherein the adhesive member is provided to include at least a portion of the fusion area.
  2. In Article 1, The above adhesive member is provided on a first side of the electrode assembly where the outermost end region of the separator is located, and on a second side located on the other side of the first side, in a secondary battery.
  3. In Article 2, A secondary battery in which the fusion region is located in at least one of a plurality of folded regions where the separator is folded.
  4. In Paragraph 3, The electrode assembly has the first electrode plate or the second electrode plate exposed, and The above adhesive member is, The outer surface of the bending region of the separator on the second side and the end of the first electrode plate or the end of the second electrode plate are provided, A secondary battery provided at the outermost end region of the separator on the first side, the outer surface of the bent region of the separator other than the fusion region, the end of the leading region of the separator, the end of the first electrode plate, and the end of the second electrode plate.
  5. In Paragraph 3, The above electrode assembly has the separator exposed, and The above adhesive member is, The outer surface of the bending region of the separator on the second side and the end of the first electrode plate or the end of the second electrode plate are provided, A secondary battery having the outermost end region of the separator on the first side, the outer surface of the bent region of the separator other than the fusion region, and the end of the leading edge region of the separator, and the end of the first electrode plate or the end of the second electrode plate on the second side where the adhesive member is not provided.
  6. In Article 2, A secondary battery, wherein the fusion region is located at the entirety of a plurality of folded regions where the separator is folded and at the end of the leading edge region of the separator.
  7. In Article 6, The electrode assembly has the first electrode plate or the second electrode plate exposed, and The above adhesive member is, The outer surface of the bending region of the separator on the second side and the end of the first electrode plate or the end of the second electrode plate are provided, A secondary battery provided at the outermost end region of the separator on the first side and at the end of the exposed first electrode plate or the end of the second electrode plate.
  8. In Article 6, The above electrode assembly has the separator exposed, and The above adhesive member is, The bending area of the separator on the second side and the end of the first electrode plate or the end of the second electrode plate are provided, A secondary battery provided in the outermost end region of the separator on the first side.
  9. In Article 6, A secondary battery in which the outermost end region of the separator and the leading end region of the separator meet at their ends.
  10. In Article 2, A secondary battery in which the length of the outermost end region of the separator is smaller than or equal to the stacking direction height of the electrode assembly.
  11. In Article 1, The above adhesive member is provided on the outer surface of the outermost end region of the separator, a secondary battery.
  12. In Article 1, The above adhesive member is a secondary battery provided on the inner side of the outermost end region of the separator.
  13. In Article 1, A secondary battery, wherein the adhesive member is provided along the circumference at at least a portion of the longitudinal direction of the electrode assembly.
  14. In Article 1, The above adhesive member is provided on the entire outer surface of the electrode assembly, a secondary battery.
  15. In Article 1, The above adhesive member is provided in the area of the entire outer surface of the electrode assembly excluding the electrolyte injection area, in a secondary battery.
  16. In Article 1, The above case comprises a front portion and a rear portion combined to form wing portions on one side and the other side of the case; and It is provided with a storage portion between the wing portions and housing the electrode assembly inside, and The above adhesive member is a secondary battery provided in the wing portion or the storage portion.
  17. In Article 1, The above adhesive member comprises at least one of an adhesive tape and an adhesive, for a secondary battery.
  18. In Article 17, A secondary battery, wherein the adhesive member is provided in a specific pattern on a portion of the attachment area where the wing portion and the storage portion meet, or is provided on the entire surface of the attachment area.
  19. In Article 1, The electrode assembly has the first electrode plate disposed at the lower part of the separator and the second electrode plate disposed at the upper part of the separator, and A secondary battery in which the separator or the first electrode plate is exposed to the front and rear portions of the electrode assembly.
  20. In Article 1, The electrode assembly has the second electrode plate disposed at the lower part of the separator and the first electrode plate disposed at the upper part of the separator, and A secondary battery in which the separator or the second electrode plate is exposed to the front and rear portions of the electrode assembly.

Description

Secondary Battery The embodiments of the present disclosure relate to secondary batteries. 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 energy 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. 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 perspective view illustrating the structure of a secondary battery according to one embodiment. FIG. 2 is a plan view illustrating an electrode assembly according to one embodiment. FIG. 3 is a cross-sectional view showing the 3-3' portion of the electrode assembly of a secondary battery according to FIG. 1. FIG. 4 is a cross-sectional view of an electrode assembly finished with a separator among the electrode assemblies of a secondary battery according to one embodiment. FIG. 5 is a cross-sectional view of an electrode assembly in which the outermost end and the leading edge region of a separator in contact are in contact with each other among the electrode assemblies of a secondary battery according to one embodiment. FIG. 6 is a cross-sectional view of an electrode assembly finished with a separator among the electrode assemblies of a secondary battery according to one embodiment. FIG. 7 is a cross-sectional view of an electrode assembly having an adhesive member provided on the inner surface of the outermost end of a separator among the electrode assemblies of a secondary battery according to one embodiment. FIG. 8 is a plan view illustrating an electrode assembly according to various embodiments. FIG. 9 is a vertical cross-sectional view of an electrode assembly of a secondary battery according to FIG. 8. FIG. 10 is a vertical cross-sectional view illustrating a secondary battery according to one embodiment, wherein an adhesive member is provided in the wing portion and the storage portion. FIG. 11 is a perspective view illustrating a state in which an adhesive member is attached to at least one of the wing portion and the storage portion of a secondary battery according to one embodiment. FIG. 12 is a perspective view illustrating a state in which an adhesive member is attached to at least one of the wing portion and the storage portion of a secondary battery according to various embodiments. FIG. 13 is a schematic diagram simply illustrating a smartphone equipped with a secondary battery according to one embodiment. FIG. 14 is a perspective view illustrating an exemplary battery module. FIGS. 15a and FIGS. 15b are perspective views illustrating an exemplary battery pack. FIGS. 16a and FIGS. 16b are a perspective view and a side view illustrating an exemplary vehicle body and vehicle body parts. 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 may appropriately define the concepts of terms to best describe his invention, they should be interpreted in a meaning and concept consistent with the technical spirit of the present invention. Therefore, it should be understood that 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; thus, various equivalents and modifications that can replace them may exist at the time of filing this application. Furthermore, as used in this specification, "comprise" or "include" and/or "comprising" or "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, ele