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KR-20260067627-A - SECONDARY BATTERY

KR20260067627AKR 20260067627 AKR20260067627 AKR 20260067627AKR-20260067627-A

Abstract

The present disclosure relates to a secondary battery, and the technical problem to be solved is to provide a secondary battery that allows all electrode plates within an electrode assembly to react uniformly by improving the reactivity of the electrode plate located in the center by varying the number of tabs on each different electrode plate. To this end, the present disclosure provides an electrode assembly stacked with a separator interposed between a plurality of first electrode plates having a first substrate tab arranged in one direction and a plurality of second electrode plates having a second substrate tab arranged in the other direction, a case housing the electrode assembly, and a cap assembly sealing the case, each having a pair of current collector plates electrically connected to the first substrate tab and the second substrate tab, respectively, wherein each of the plurality of first electrode plates is provided with at least one first substrate tab, and the first substrate tab is most frequently arranged on the first electrode plate stacked in the center based on the stacking direction of the plurality of first electrode plates.

Inventors

  • 고재욱

Assignees

  • 삼성에스디아이 주식회사

Dates

Publication Date
20260513
Application Date
20241106

Claims (20)

  1. An electrode assembly stacked such that a separator is interposed between a plurality of first electrode plates, each having a first substrate tab arranged in one direction, and a plurality of second electrode plates, each having a second substrate tab arranged in the other direction; A case for housing the above electrode assembly; and It includes a cap assembly that seals the case, having a pair of current collector plates electrically connected to the first substrate tab and the second substrate tab, respectively. Each of the above plurality of first electrode plates is provided with at least one first substrate tab, and The above first substrate tab is a secondary battery in which the most first electrode plates are stacked in the central part based on the stacking direction of the plurality of first electrode plates.
  2. In Article 1, A secondary battery in which each of the plurality of first electrode plates is densely packed in a central region, and the first substrate tab is arranged based on the central region.
  3. In Article 1, A secondary battery in which the plurality of first electrode plates are stacked such that the first substrate tabs are arranged in a rhombus shape.
  4. In Article 1, A secondary battery comprising a plurality of first electrode plates, each comprising at least one first layer stacked on the inner side based on the stacking direction, at least one second layer stacked in the central part, and at least one third layer stacked on the outer side.
  5. In Article 4, A secondary battery in which the first substrate tab of the second layer is arranged more than the first substrate tab of the first layer and the first substrate tab of the third layer.
  6. In Article 5, A secondary battery in which the number of first substrate tabs of the first layer and the number of first substrate tabs of the third layer are the same.
  7. In Article 5, A secondary battery in which the first substrate tabs of each of the first layer, the second layer, and the third layer protrude by the same length.
  8. In Article 7, The above current collector plate is welded to the above first substrate tab, and A secondary battery in which the welded area of the above current collector plate is in the shape of a rhombus.
  9. In Article 4, The first substrate tabs of each of the first layer and the third layer protrude with the same length, A secondary battery in which the first substrate tabs of each of the first layer and the third layer, and the first substrate tab of the second layer protrude at different lengths.
  10. In Article 9, A secondary battery in which the protrusion length of the first substrate tab of the second layer is greater than the protrusion length of the first substrate tab of each of the first layer and the third layer.
  11. In Article 10, The above-mentioned first substrate tab is pressed based on the above-mentioned second layer, and A secondary battery in which the pressurized first substrate tab of the second layer is bent to one side and welded to the current collector plate.
  12. In Article 9, A secondary battery in which the protrusion length of the first substrate tab of the second layer is smaller than the protrusion length of the first substrate tab of each of the first layer and the third layer.
  13. In Article 12, The above-mentioned first substrate tab is pressed based on the above-mentioned second layer, and A secondary battery in which the pressurized first substrate tabs of each of the first, second, and third layers have the same end position.
  14. In Article 4, The side surface of the first electrode plate where the first substrate tab protrudes includes a central region and an edge region, and The first substrate tab of the second layer is provided in the central region and the edge region, and A secondary battery in which the lengths of the first substrate tab provided in the central region of the second layer and the first substrate tab provided in the edge region are the same or different.
  15. In Article 14, A secondary battery, wherein the first substrate tab provided in the edge region of the second layer protrudes longer than the first substrate tab provided in the central region.
  16. In Article 15, A secondary battery, wherein the first substrate tab provided in the edge region of the second layer is bent to one side and welded to the current collector plate.
  17. In Article 4, The first layer and the third layer each include a plurality of electrode plates, and A secondary battery having many substrate tabs arranged toward the center side based on the stacking direction of the plurality of electrode plates.
  18. In Article 1, The above case includes a bottom surface and a long side surface and a short side surface extending upward from the bottom surface, and The above cap assembly further includes a first terminal plate electrically connected to the first electrode plate, and The first current collector plate comprises: a first terminal connection portion connected to the first terminal plate; and A secondary battery comprising a first electrode connection portion that extends from the first terminal connection portion parallel to the above-mentioned single side and is coupled to the first electrode plate.
  19. In Article 1, Each of the above plurality of second electrode plates is provided with at least one second substrate tab, and The above second substrate tab is a secondary battery in which the second electrode plate stacked in the center is most frequently arranged based on the stacking direction of the plurality of second electrode plates.
  20. In Article 1, A secondary battery in which the outermost layer of the plurality of first electrode plates comprises one first electrode tab.

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 an exploded perspective view illustrating a secondary battery according to one embodiment of the present invention. Figure 2 is a cross-sectional view illustrating the secondary battery of Figure 1. FIG. 3 is a cross-sectional view of the tab protrusion side of an electrode assembly in a secondary battery according to one embodiment of the present invention. FIG. 4 is a perspective view of an electrode assembly in a secondary battery according to one embodiment of the present invention. FIGS. 5 to 7 are perspective views of an electrode assembly among secondary batteries according to various embodiments of the present invention. FIG. 8 is a side view illustrating the combined state of a current collector plate and an electrode assembly in a secondary battery according to one embodiment of the present invention. FIG. 9 is a side view illustrating the combined state of a current collector plate and an electrode assembly in a secondary battery according to another embodiment of the present invention. FIG. 10 is a perspective view illustrating a battery module according to one embodiment of the present invention. FIGS. 11 and FIGS. 12 are perspective views illustrating a battery pack according to one embodiment of the present invention. FIGS. 13 and FIGS. 14 are a perspective view and a side view, respectively, illustrating a vehicle body and a vehicle body part according to an embodiment of the present invention. 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, elements, and/or groups. Additionally, when describing embodiments of the present invention, “may” or “may” may include “one or more embodiments of the present invention.” 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, substantial identity may include deviations considered low in the industry, for example, deviations within 5%. Additionally, the statement that a parameter is uniform in a given area may mean that it is uniform from an average perspective. Although terms such as "first," "second," etc., are used to describe various components, it goes without saying