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EP-4738497-A1 - SECONDARY BATTERY

EP4738497A1EP 4738497 A1EP4738497 A1EP 4738497A1EP-4738497-A1

Abstract

A secondary battery includes a case including a sealing area provided along a periphery of the case. An electrode assembly is accommodated in the case. An adhesive member is bonded to the case and the electrode assembly. At least a portion of the adhesive member is coupled to the sealing area.

Inventors

  • SONG, HO JIN
  • LEE, JE HYUN
  • SONG, JUNG YEON

Assignees

  • SAMSUNG SDI CO., LTD.

Dates

Publication Date
20260506
Application Date
20250715

Claims (15)

  1. A secondary battery (100) comprising: a case (110) comprising a sealing area (113) provided along a periphery of the case (110); an electrode assembly (120) accommodated in the case (110); and an adhesive member (140) bonded to the case (110) and the electrode assembly (120), wherein at least a portion of the adhesive member (140) is coupled to the sealing area (113).
  2. The secondary battery (100) as claimed in claim 1, wherein the case (110) comprises: a first case (111) covering a first side of the electrode assembly (120); and a second case (112) covering a second side of the electrode assembly (120), and wherein the sealing area (113) comprises: a lateral sealing portion (1131) provided where the first and second cases (111, 112) are sealed to each other in an area corresponding to a lateral side of the electrode assembly (120); and a front sealing portion (1132) provided where the first and second cases (111, 112) are sealed to each other in an area corresponding to a front side of the electrode assembly (120).
  3. The secondary battery (100) as claimed in claim 2, wherein at least a portion of the adhesive member (140) is coupled to the lateral sealing portion (1131); or extends beyond the lateral side of the electrode assembly (120) and is coupled to the lateral sealing portion (1131).
  4. The secondary battery (100) as claimed in claim 2 or 3, wherein the lateral sealing portion (1131) comprises two lateral sealing portions that are opposite each other with respect to the electrode assembly (120), and wherein the adhesive member (140) extends to the two lateral sealing portions or one of the two lateral sealing portions.
  5. The secondary battery (100) as claimed in any one of claims 1 to 4, wherein a longitudinal width of the adhesive member (140) is equal to or less than a longitudinal width of the electrode assembly (120).
  6. The secondary battery (100) as claimed in any one of claims 2 to 5, wherein a lateral width of a portion of the adhesive member (140) coupled to the lateral sealing portion (1131) is equal to or less than a lateral width of the lateral sealing portion (1131).
  7. The secondary battery (100) as claimed in any one of claims 2 to 6, wherein a portion of the adhesive member (140) is coupled to the front sealing portion (1132).
  8. The secondary battery (100) as claimed in any one of claims 2 to 7, wherein a portion of the adhesive member (140) extends beyond the front side of the electrode assembly (120) and is coupled to the front sealing portion (1132).
  9. The secondary battery (100) as claimed in any one of claims 2 to 8, wherein the adhesive member (140) extends from a center portion of the front side of the electrode assembly (120) to the front sealing portion (1132); two opposite side portions of the front side of the electrode assembly (120) to the front sealing portion (1132); or a center and at least one side portion of the front side of the electrode assembly (120) to the front sealing portion (1132).
  10. The secondary battery (100) as claimed in any one of claims 2 to 9, wherein a lateral width of a portion of the adhesive member (140) coupled to the front sealing portion (1132) is equal to or less than a lateral width of the front sealing portion (1132).
  11. The secondary battery (100) as claimed in any one of claims 2 to 10, wherein the electrode assembly (120) comprises: a first substrate tab (1211) extending through the front side; a first cell tab welded to the first substrate tab (1211); a second substrate tab (1221) extending through the front side; and a second cell tab welded to the second substrate tab (1221), and wherein the first cell tab and the second cell tab extend through the front sealing portion (1132) to outside of the case (110).
  12. The secondary battery (100) as claimed in claim 11, wherein the adhesive member (140) is coupled to a portion of the front sealing portion (1132) that is spaced apart from the first cell tab and the second cell tab.
  13. The secondary battery (100) as claimed in claim 11 or 12, wherein a first insulating tape (1311) is interposed between the first cell tab and the front sealing portion (1132), wherein a second insulating tape (1321) is interposed between the second cell tab and the front sealing portion (1132), and wherein the adhesive member (140) is spaced apart from the first insulating tape (1311) and the second insulating tape (1321), or wherein the adhesive member (140) overlaps the first insulating tape (1311) and the second insulating tape (1321).
  14. The secondary battery (100) as claimed in any one of claims 2 to 13, wherein the lateral sealing portion (1131) comprises two lateral sealing portions that are opposite to each other with respect to the electrode assembly (120), and wherein the adhesive member (140) is coupled to the two lateral sealing portions and the front sealing portion (1132).
  15. The secondary battery (100) as claimed in any one of claims 2 to 14, wherein a first portion of the adhesive member (140) extends to outside the lateral side of the electrode assembly (120) and is coupled to the lateral sealing portion (1131), and wherein a second portion of the adhesive member (140) extends to outside the front side of the electrode assembly (120) and is coupled to the front sealing portion (1132).

Description

CROSS-REFERENCE TO THE RELATED APPLICATION The present application claims priority to and the benefit of Korean Patent Application No. 10-2024-0151706, filed on October 31, 2024, in the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference. BACKGROUND 1. Field The present disclosure relates to a secondary battery. 2. Description of the Related Art Unlike primary batteries that are not designed to be (re)charged, secondary (or rechargeable) batteries are batteries that are designed to be discharged and recharged. Low-capacity secondary batteries are used in portable, small electronic devices, such as smart phones, feature phones, notebook computers, digital cameras, and camcorders, while large-capacity secondary batteries are widely used as power sources for driving motors in hybrid vehicles and electric vehicles and for storing power (e.g., home and/or utility scale power storage). A secondary battery generally includes an electrode assembly composed of a positive electrode and a negative electrode, a case accommodating the same, and electrode terminals connected to the electrode assembly. The above information disclosed in this Background section is for enhancement of understanding of the background of the present disclosure, and therefore, it may contain information that does not constitute related (or prior) art. SUMMARY In accordance with the present disclosure a secondary battery as set forth in independent claim 1, is provided. Currently preferred embodiments are described in the dependent claims. The present disclosure provides a secondary battery capable of preventing separation of an electrode assembly from a case (e.g., falling out of the electrode assembly from the case) during a battery manufacturing process and undesirable movement of the electrode assembly relative to the case after completion of the battery manufacturing process. These and other aspects and features of the present disclosure will be described in or will be apparent from the following description of embodiments of the present disclosure. According to aspects of the present disclosure, a secondary battery includes a case having a sealing area provided along the periphery of the case, an electrode assembly accommodated in the case, and an adhesive member bonded to the case and the electrode assembly. At least a portion of the adhesive member is coupled to the sealing area. In one or more embodiments, the case may include a first case covering a first side of the electrode assembly and a second case covering a second side of the electrode assembly, and the sealing area may include a lateral sealing portion provided where the first and second cases are sealed to each other in an area corresponding to a lateral side of the electrode assembly and a front sealing portion provided where the first and second cases are sealed to each other in an area corresponding to a front side of the electrode assembly. The first side of the electrode assembly may be opposite the second side of the electrode assembly. In one or more embodiments, at least a portion of the adhesive member may be coupled to the lateral sealing portion. In one or more embodiments, at least a portion of the adhesive member may extend beyond the lateral side of the electrode assembly and may be coupled to the lateral sealing portion. In one or more embodiments, the lateral sealing portion may include two lateral sealing portions that are opposite each other with respect to the electrode assembly, and the adhesive member may extend to the two lateral sealing portions. In one or more embodiments, the lateral sealing portion may include two lateral sealing portions that are opposite each other with respect to the electrode assembly, and the adhesive member may extend to one of the two lateral sealing portions. In one or more embodiments, the longitudinal width of the adhesive member may be equal to or less than the longitudinal width of the electrode assembly. In one or more embodiments, the lateral width of a portion of the adhesive member coupled to the lateral sealing portion may be equal to or less than the lateral width of the lateral sealing portion. In one or more embodiments, a portion of the adhesive member may be coupled to the front sealing portion. In one or more embodiments, a portion of the adhesive member may extend beyond the front side of the electrode assembly and may be coupled to the front sealing portion. In one or more embodiments, the adhesive member may extend from the center portion of the front side of the electrode assembly to the front sealing portion. In one or more embodiments, the adhesive member may extend from two opposite side portions of the front side of the electrode assembly to the front sealing portion. In one or more embodiments, the adhesive member may extend from the center and at least one side portion of the front side of the electrode assembly to the front sealing portion. In one or