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EP-4742420-A1 - SECONDARY BATTERY AND BATTERY PACK COMPRISING SAME

EP4742420A1EP 4742420 A1EP4742420 A1EP 4742420A1EP-4742420-A1

Abstract

The present disclosure relates to a secondary battery. An aspect of the present disclosure may provide a secondary battery including: a pouch-type case including a first pouch and a second pouch connected to each other, the pouch-type case being folded along a folding line such that an accommodation space surrounded by the first pouch and the second pouch is formed; an electrode assembly accommodated in the accommodation space; and a film- or sheet-shaped spacer that is spaced apart from the electrode assembly in the direction of the folding line and interposed between the first pouch and the second pouch.

Inventors

  • SHIN, DONG IL

Assignees

  • LG Energy Solution, Ltd.

Dates

Publication Date
20260513
Application Date
20241002

Claims (20)

  1. A secondary battery comprising: a pouch-type case including a first pouch and a second pouch connected to each other, the pouch-type case being folded along a folding line such that an accommodation space surrounded by the first pouch and the second pouch is formed; an electrode assembly accommodated in the accommodation space; and a film- or sheet-shaped spacer that is spaced apart from the electrode assembly in a direction of the folding line and interposed between the first pouch and the second pouch.
  2. The secondary battery according to claim 1, wherein the pouch-type case includes a bridge provided along the folding line to connect the first pouch and the second pouch.
  3. The secondary battery according to claim 2, wherein one edge of the spacer extends in parallel to the bridge.
  4. The secondary battery according to claim 2, wherein one edge of the spacer is in contact with the bridge.
  5. The secondary battery according to claim 2, wherein the bridge extends in the direction of the folding line and has a predetermined width in a thickness direction of the spacer.
  6. The secondary battery according to claim 2, wherein the first pouch and the second pouch each include: an accommodation portion having a recessed shape; and a terrace portion provided at a peripheral edge of the accommodation portion, wherein the spacer is interposed between the terrace portion of the first pouch and the terrace portion of the second pouch.
  7. The secondary battery according to claim 2, wherein the first pouch includes an accommodation portion having a recessed shape and a terrace portion provided at a peripheral edge of the accommodation portion, wherein the second pouch is formed flat, and wherein the spacer is interposed between the terrace portion of the first pouch and the terrace portion of the second pouch.
  8. The secondary battery according to claim 6, wherein the bridge includes: an accommodation portion-side connecting portion extending in the direction of the folding line to connect the accommodation portion of the first pouch and the accommodation portion of the second pouch; and a terrace portion-side connecting portion extending from the accommodation portion-side connecting portion to connect the terrace portion of the first pouch and the terrace portion of the second pouch.
  9. The secondary battery according to claim 8, wherein the accommodation portion-side connecting portion has a predetermined width in a thickness direction of the spacer, and wherein the thickness of the spacer is greater than or equal to the width of the accommodation portion-side connecting portion.
  10. The secondary battery according to claim 8, wherein the terrace portion-side connecting portion has a width greater than or equal to a width of the accommodation portion-side connecting portion.
  11. The secondary battery according to claim 8, wherein the terrace portion-side connecting portion includes an outer surface parallel to the thickness direction of the spacer.
  12. The secondary battery according to claim 8, wherein the terrace portion-side connecting portion and the accommodation portion-side connecting portion are connected to each other and extend to be at least partially positioned on a same line.
  13. The secondary battery according to claim 8, wherein a portion where the terrace portion-side connecting portion and the terrace portion of the first pouch are connected, and a portion where the terrace portion-side connecting portion and the terrace portion of the second pouch are connected, are bent such that the terrace portion of the first pouch and the terrace portion of the second pouch face each other.
  14. The secondary battery according to claim 8, wherein the terrace portion-side connecting portion spreads out or flattens in a thickness direction of the spacer such that one portion adjacent to the terrace portion of the first pouch and another portion adjacent to the terrace portion of the second pouch are not in contact with each other.
  15. The secondary battery according to claim 1, wherein the spacer includes a first layer and a second layer stacked on each other, and wherein the first layer and the second layer have different rigidities.
  16. The secondary battery according to claim 1, wherein the spacer includes a first spacer and a second spacer which are respectively spaced apart on opposite sides of the electrode assembly in the direction of the folding line.
  17. The secondary battery according to claim 1, wherein the spacer extends along a periphery of the accommodation space.
  18. The secondary battery of claim 1, wherein the spacer includes: a first layer; and a second layer and a third layer respectively provided on opposite surfaces of the first layer.
  19. The secondary battery according to claim 1, wherein the second and third layers include a resin material that becomes adhesive when heated, allowing the second and third layers to be bonded to the first and second pouches, respectively, by heat or pressure.
  20. A battery pack comprising: the secondary battery according to claim 1; and a packaging configured to accommodate the secondary battery.

Description

TECHNICAL FIELD CROSS-REFERENCE TO RELATED APPLICATIONS This application is based on and claims priority from Korean Patent Application No. 10-2023-0136015, filed on October 12, 2023 and No. 10-2024-0111275, filed on August 20, 2024, with the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference. TECHNICAL FIELD The present disclosure relates to a secondary battery in which an electrode is accommodated in a pouch-type case, and a battery pack including the same. BACKGROUND ART With the rapid distribution of electronic devices that use batteries, such as mobile phones, laptop computers, and electric vehicles, the demand for small, lightweight, yet relatively high-capacity secondary batteries has been rapidly increasing. In particular, lithium secondary batteries, which are lightweight and have high energy density, are gaining attention as power sources for the portable devices. Secondary batteries are classified into prismatic, cylindrical, and pouch types, depending on the shape of the case or cladding that accommodates the electrode assembly. Each secondary batter type has distinct characteristics. For example, the prismatic battery, which has a flat and angular box-like shape, is surrounded by an aluminum can, making it resistant to external impacts, highly durable, and relatively safe. The cylindrical battery, which has a metal cylinder shape similar to a commonly used dry cell, has a robust metal exterior. In addition, the pouch-type battery has a shape similar to a pouch, and is in the form of a battery contained in a film pouch. SUMMARY TECHNICAL PROBLEM The present disclosure provides a secondary battery with high energy density and a battery pack including the same. Any details not explicitly mentioned in the present disclosure will be clearly understood by those skilled in the art from the following description. TECHNICAL SOLUTION An aspect of the present disclosure provides a secondary battery including: a pouch-type case including a first pouch and a second pouch connected to each other, the pouch-type case being folded along a folding line such that an accommodation space surrounded by the first pouch and the second pouch is formed; an electrode assembly accommodated in the accommodation space; and a film- or sheet-shaped spacer that is spaced apart from the electrode assembly in the direction of the folding line and interposed between the first pouch and the second pouch. At this time, the pouch-type case may include a bridge provided along the folding line to connect the first pouch and the second pouch. At this time, one edge of the spacer may extend in parallel to the bridge. At this time, one edge of the spacer may be in contact with the bridge. At this time, the bridge may extend long in the direction of the folding line and may have a predetermined width in the thickness direction of the spacer. At this time, the first pouch and the second pouch may each include an accommodation portion having a recessed shape, and a terrace portion provided at a peripheral edge of the accommodation portion. The spacer may be interposed between the terrace portion of the first pouch and the terrace portion of the second pouch. At this time, the first pouch may include an accommodation portion having a recessed shape and a terrace portion provided at a peripheral edge of the accommodation portion, the second pouch may be formed flat, and the spacer may be interposed between the terrace portion of the first pouch and the terrace portion of the second pouch. At this time, the bridge may include: an accommodation portion-side connecting portion extending in the direction of the folding line to connect the accommodation portion of the first pouch and the accommodation portion of the second pouch; and a terrace portion-side connecting portion extending from the accommodation portion-side connecting portion to connect the terrace portion of the first pouch and the terrace portion of the second pouch. At this time, the accommodation portion-side connecting portion may have a predetermined width in the thickness direction of the spacer, and the thickness of the spacer may be greater than or equal to the width of the accommodation portion-side connecting portion. At this time, the terrace portion-side connecting portion may have a width greater than or equal to that of the accommodation portion-side connecting portion. At this time, the terrace portion-side connecting portion may include an outer surface parallel to the thickness direction of the spacer. At this time, the terrace portion-side connecting portion and the accommodation portion-side connecting portion may be connected to each other and extend to be at least partially positioned on the same line. At this time, a portion where the terrace portion-side connecting portion and the terrace portion of the first pouch are connected and a portion where the terrace portion-side connecting portion and the