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KR-20260064070-A - SECONDARY BATTERY AND METHOD FOR MANUFACTURING THE SAME

KR20260064070AKR 20260064070 AKR20260064070 AKR 20260064070AKR-20260064070-A

Abstract

The present disclosure provides a secondary battery. The secondary battery comprises an electrode assembly including a plurality of stacked electrode plates and a conductor coupled to the electrode assembly, wherein each of the plurality of electrode plates comprises a composite portion in which an active material is coated on both sides of a composite substrate and a non-composite portion in which an active material is not coated on the composite substrate, and at least a portion of the conductor penetrates the non-composite portion of each of the plurality of electrode plates.

Inventors

  • 조병휘

Assignees

  • 삼성에스디아이 주식회사

Dates

Publication Date
20260507
Application Date
20241031

Claims (20)

  1. An electrode assembly comprising a plurality of stacked electrode plates; and A conductor coupled to the above electrode assembly Includes, Each of the above plurality of electrode plates is, A composite portion having an active material coated on both sides of a composite substrate; and The uncoated portion of the above composite substrate where the active material is not coated Includes, A secondary battery in which at least a portion of the above-mentioned conductor penetrates the unincorporated portion of each of the plurality of electrode plates.
  2. In paragraph 1, The above composite material is, Polymer substrate; A first metal layer disposed on one surface of the polymer substrate; and A second metal layer disposed on the other side of the polymer substrate. Includes, A secondary battery in which the first metal layer and the second metal layer are formed of the same material.
  3. In paragraph 1, The above-mentioned conductor comprises a first conductor connected to a terminal, and is a secondary battery.
  4. In paragraph 3, A secondary battery comprising a second conductor that is bent and connected at the other end of the first conductor.
  5. In paragraph 4, The above second conductor penetrates the unoccupied portion of each of the plurality of electrode plates, in a secondary battery.
  6. In paragraph 4, One end of the second conductor is connected to the other end of the first conductor, and A secondary battery comprising a third conductor that is bent and connected at the other end of the second conductor.
  7. In paragraph 6, A secondary battery in which one surface of the third conductor is combined with one surface of the non-conductive portion closest to the third conductor among the non-conductive portions of each of the plurality of electrode plates.
  8. In paragraph 6, One end of the third conductor is connected to the other end of the second conductor, and A secondary battery comprising a conductor further including a fourth conductor that is bent and connected at the other end of the third conductor.
  9. In paragraph 8, A secondary battery in which at least a portion of the fourth conductor is connected to at least a portion of the unpaired portions of the plurality of electrode plates.
  10. In paragraph 8, The above-mentioned fourth conductor covers the end of the uninsulated portion of the plurality of electrode plates, in a secondary battery.
  11. In paragraph 8, The length of the second conductor is longer than the length of the fourth conductor, and A secondary battery in which the length of the fourth conductor is longer than the length of the third conductor.
  12. In paragraph 1, A secondary battery in which the width of the conductor is smaller than the width of the unused portion of each of the plurality of electrode plates.
  13. In paragraph 1, A secondary battery in which the lengths of the unoccupied portions of each of the above-mentioned plurality of electrode plates are different from each other.
  14. In paragraph 1, A secondary battery in which the length of the unincorporated portion of each of the above-mentioned plurality of electrode plates is the same.
  15. A step of manufacturing an electrode assembly by stacking a plurality of electrode plates; and Step of combining the conductor with the electrode assembly Includes, Each of the above plurality of electrode plates is, A composite portion having an active material coated on both sides of a composite substrate; and The uncoated portion of the above composite substrate where the active material is not coated Includes, The above combining step is, Step of penetrating at least a portion of the above conductor into the unoccupied portion of each of the plurality of electrode plates A method for manufacturing a secondary battery, comprising
  16. In paragraph 15, The above composite material is, Polymer substrate; A first metal layer disposed on one surface of the polymer substrate; and A second metal layer disposed on the other side of the polymer substrate. Includes, A method for manufacturing a secondary battery, wherein the first metal layer and the second metal layer are formed of the same material.
  17. In paragraph 15, A step of connecting one end of the first conductor of the above-mentioned conductor to a terminal A method for manufacturing a secondary battery, further comprising
  18. In Paragraph 17, The above-mentioned penetrating step is, A step of penetrating a second conductor, which is bent and connected at the other end of the first conductor, through the unoccupied portion of each of the plurality of electrode plates. A method for manufacturing a secondary battery, comprising
  19. In Paragraph 18, One end of the second conductor is connected to the other end of the first conductor, and The above combining step is, A step of combining one surface of a third conductor, which is bent and connected at the other end of the second conductor, with one surface of the unoccupied portion closest to the third conductor among the unoccupied portions of each of the plurality of electrode plates. A method for manufacturing a secondary battery, further comprising
  20. In Paragraph 19, One end of the third conductor is connected to the other end of the second conductor, and The above combining step is, A step of connecting at least a portion of a fourth conductor, which is bent and connected at the other end of the third conductor, to at least a portion of the unbent portions of the plurality of electrode plates. A method for manufacturing a secondary battery, further comprising

Description

Secondary Battery and Method for Manufacturing the 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. Recently, there has been a growing customer demand for weight reduction in secondary batteries used in portable IT devices, automobiles, and the like. To achieve this, some conventional technologies have been developed by thinning materials such as substrates, separators, and casings, or by increasing energy density through the improvement of active material properties. However, some of these development directions have resulted in a decrease in the safety of secondary batteries. 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 shows an example of a secondary battery according to one embodiment of the present disclosure. FIG. 2 is a drawing showing an example of a composite substrate according to one embodiment of the present disclosure. FIG. 3 is a cross-sectional view showing an example of a conductor according to one embodiment of the present disclosure. FIG. 4 is a drawing showing an example in which a conductor according to one embodiment of the present disclosure is connected to a plurality of uninsulated parts. FIG. 5 is a drawing showing an example of a conductor according to one embodiment of the present disclosure. FIG. 6 is a drawing showing an example of a conductor according to one embodiment of the present disclosure. FIG. 7 is a drawing showing an example in which a conductor according to one embodiment of the present disclosure is coupled to an electrode assembly. FIG. 8 is a drawing showing an example in which a conductor according to one embodiment of the present disclosure is coupled to an electrode assembly. FIG. 9 is a flowchart illustrating an example of a method according to one embodiment of 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, to aid in understanding the invention, the attached drawings are not drawn to actual scale, and the dimensions of some components may be exaggerated. Furthermore, the same reference numerals may be assigned to identical components in different embodiments. 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, elements, and/or groups. Additionally, to aid in understanding the invention, the attached drawings are not drawn to actual scale, and the dimensions of some components may be exaggerated. Furthermore, the same reference numerals may be assigned to identical components in different embodiments. The statement that two subjects of comparison are 'identical' means that they are 'substantially identical'. Therefore