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CN-122000562-A - Secondary battery

CN122000562ACN 122000562 ACN122000562 ACN 122000562ACN-122000562-A

Abstract

The secondary battery includes an electrode assembly including a positive electrode plate, a negative electrode plate, and a separator, a lead part electrically connected to the electrode assembly, a case accommodating the electrode assembly, and a reinforcing member surrounding a connection portion of the electrode assembly between the electrode assembly and the lead part, and edges of the electrode assembly inside the case.

Inventors

  • SONG HAOZHEN
  • LI JIXIAN
  • SONG DINGYAN

Assignees

  • 三星SDI株式会社

Dates

Publication Date
20260508
Application Date
20250722
Priority Date
20241107

Claims (20)

  1. 1. A secondary battery, comprising: an electrode assembly including a positive electrode plate, a negative electrode plate, and a separator; A lead part electrically connected to the electrode assembly; A case accommodating the electrode assembly, and And a reinforcement member surrounding a connection portion of the electrode assembly between the electrode assembly and the lead portion, and edges of the lead portion and the electrode assembly inside the case.
  2. 2. The secondary battery according to claim 1, wherein the positive electrode plate, the negative electrode plate, and the separator are stacked or wound.
  3. 3. The secondary battery according to claim 1, wherein the reinforcement member comprises a tape or film attached to the outside of the electrode assembly.
  4. 4. The secondary battery according to claim 3, wherein the reinforcing member comprises a binder and a synthetic resin selected from the group consisting of polyethylene terephthalate, polypropylene, and polyimide.
  5. 5. The secondary battery according to any one of claims 1 to 3, wherein the reinforcing member includes: A first reinforcement member wrapped around the edge of the electrode assembly, the connection portion of the electrode assembly, and the lead part at a first side in a length direction of the electrode assembly; a second reinforcement member wrapped around the edge of the electrode assembly at a second side in the length direction of the electrode assembly; a third reinforcing member wrapped around the edge of the electrode assembly at one side in the width direction of the electrode assembly, and And a fourth reinforcement member wrapped around the edge of the electrode assembly at the other side of the electrode assembly in the width direction.
  6. 6. The secondary battery according to claim 5, wherein the first reinforcement member comprises: a first base portion contacting the underside of the electrode assembly, and And a first cover in contact with the upper side of the electrode assembly and the first base, the first cover wrapping around the upper edge of the electrode assembly together with the first base.
  7. 7. The secondary battery according to claim 6, wherein the first reinforcement member further comprises a fixing layer on an underside of the first base, the fixing layer having an adhesive composition and being fixed to the case.
  8. 8. The secondary battery according to claim 6, wherein: one side of the first cover is fixed to the upper side of the electrode assembly, and The first cover is pressed by a work roll to be coupled to the first base.
  9. 9. The secondary battery according to claim 5, wherein the first reinforcement member further includes an insulating portion including an insulating material, the insulating portion extending between the lead portion and the case and being fixed to the case by an adhesive composition.
  10. 10. The secondary battery according to claim 5, wherein the first reinforcement member comprises: A first reinforcement sub-member covering the positive electrode tab of the electrode assembly, and A second reinforcement sub-member covering the negative electrode tab of the electrode assembly, Wherein the first and second reinforcing sub-members are spaced apart from one another.
  11. 11. A secondary battery, comprising: an electrode assembly including a positive electrode plate, a negative electrode plate, and a separator; A lead part electrically connected to the electrode assembly; A case accommodating the electrode assembly, and And a reinforcement member wrapped around at least one of a connection portion of the electrode assembly between the electrode assembly and the lead portion, edges of the lead portion and the electrode assembly, and upper and lower sides of the electrode assembly inside the case.
  12. 12. The secondary battery according to claim 11, wherein the reinforcement member comprises: A first reinforcement member wrapped around the edge of the electrode assembly, the connection portion of the electrode assembly, and the lead part at a first side in a length direction of the electrode assembly; a second reinforcement member wrapped around the edge of the electrode assembly at a second side in the length direction of the electrode assembly; A third reinforcement member wrapped around the edge of the electrode assembly at one side in the width direction of the electrode assembly; A fourth reinforcement member wrapped around the edge of the electrode assembly at the other side of the width direction of the electrode assembly, and And a fifth reinforcement member wrapped around at least one of the upper side and the lower side of the electrode assembly.
  13. 13. The secondary battery according to claim 12, wherein the first reinforcement member comprises a single reinforcement member wrapped around the positive electrode tab of the electrode assembly and the negative electrode tab of the electrode assembly.
  14. 14. The secondary battery according to claim 12, wherein the first reinforcement member comprises: A first reinforcing sub-member wrapped around the positive electrode tab of the electrode assembly, and A second reinforcement sub-member wrapped around the negative electrode tab of the electrode assembly, Wherein the first and second reinforcing sub-members are spaced apart from one another.
  15. 15. The secondary battery according to claim 12, wherein the first reinforcement member comprises: a first base portion contacting the lower side of the electrode assembly, and A first cover in contact with the upper side of the electrode assembly and the first base, the first cover wrapping around an upper edge of the electrode assembly together with the first base.
  16. 16. The secondary battery according to claim 15, wherein the first reinforcement member further comprises a fixing layer on an underside of the first base portion, the fixing layer having an adhesive composition and being fixed to the case.
  17. 17. The secondary battery according to claim 12, wherein the first reinforcement member further includes an insulating portion including an insulating material, the insulating portion extending between the lead portion and the case and being fixed to the case by an adhesive composition.
  18. 18. The secondary battery according to claim 12, wherein the fifth reinforcement member is wrapped around the lower side of the electrode assembly.
  19. 19. The secondary battery according to any one of claims 12 to 18, wherein the fifth reinforcing member overlaps with at least one of the first reinforcing member to the fourth reinforcing member.
  20. 20. The secondary battery according to any one of claims 11 to 18, wherein the reinforcing member includes a binder and a synthetic resin selected from the group consisting of polyethylene terephthalate, polypropylene, and polyimide.

Description

Secondary battery Cross Reference to Related Applications The present application claims priority and benefit from korean patent application No. 10-2024-0156690 filed at the korean intellectual property office on day 11 and 7 of 2024, the entire disclosure of which is incorporated herein by reference. Technical Field The present disclosure relates to secondary batteries. Background Unlike primary batteries that cannot be charged, secondary batteries are rechargeable and dischargeable batteries. The low-capacity secondary battery may be used for various portable small-sized electronic devices such as a smart phone, a function phone, a notebook computer, a digital camera, or a video camcorder, and the high-capacity secondary battery is widely used as a power source for motor driving such as in a hybrid vehicle or an electric vehicle. The secondary battery includes an electrode assembly including a positive electrode and a negative electrode, a case accommodating the electrode assembly, and an electrode terminal connected to the electrode assembly. The above information disclosed in this background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art. Disclosure of Invention Embodiments include a secondary battery including an electrode assembly including a positive electrode plate, a negative electrode plate, and a separator, a lead part electrically connected to the electrode assembly, a case accommodating the electrode assembly, and a reinforcing member surrounding a connection portion of the electrode assembly between the electrode assembly and the lead part, and an edge of the electrode assembly inside the case. The positive electrode plate, the negative electrode plate, and the separator may be stacked or wound. The reinforcement member may include a tape or film attached to the outside of the electrode assembly. The reinforcement member includes an adhesive and a synthetic resin selected from the group consisting of polyethylene terephthalate, polypropylene, and polyimide. The reinforcement member may include a first reinforcement member wrapped around the edge of the electrode assembly, the connection portion of the electrode assembly, and the lead portion at a first side in the length direction of the electrode assembly, a second reinforcement member wrapped around the edge of the electrode assembly at a second side in the length direction of the electrode assembly, a third reinforcement member wrapped around the edge of the electrode assembly at one side in the width direction of the electrode assembly, and a fourth reinforcement member wrapped around the edge of the electrode assembly at the other side in the width direction of the electrode assembly. The first reinforcement member may include a first base portion in contact with the lower side of the electrode assembly, and a first cover in contact with the upper side of the electrode assembly and the first base portion, the first cover wrapping around the upper edge of the electrode assembly together with the first base portion. The first reinforcement member may further include a fixing layer on an underside of the first base, the fixing layer having an adhesive composition and being fixed to the case. One side of the first cover may be fixed to an upper side of the electrode assembly, and the first cover may be pressed by a work roll to be coupled to the first base. The first reinforcement member may further include an insulating portion including an insulating material, the insulating portion extending between the lead portion and the case and being fixed to the case by an adhesive composition. The first reinforcement member may include a first reinforcement sub-member covering the positive electrode tab of the electrode assembly, and a second reinforcement sub-member covering the negative electrode tab of the electrode assembly, wherein the first reinforcement sub-member and the second reinforcement sub-member are spaced apart from each other. Embodiments include a secondary battery including an electrode assembly including a positive electrode plate, a negative electrode plate, and a separator, a lead part electrically connected to the electrode assembly, a case accommodating the electrode assembly, and a reinforcing member wrapped around at least one of a connection portion of the electrode assembly between the electrode assembly and the lead part, an edge of the electrode assembly, and upper and lower sides of the electrode assembly inside the case. The reinforcement member may include a first reinforcement member wrapping around the edge of the electrode assembly, the connection portion of the electrode assembly, and the lead portion at a first side in the length direction of the electrode assembly, a second reinforcement member wrapping around the edge of the electrode assembly at a second side in the length direction of the electrode