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EP-3588618-B1 - SECONDARY BATTERY HAVING SYMMETRIC MULTI-TABS

EP3588618B1EP 3588618 B1EP3588618 B1EP 3588618B1EP-3588618-B1

Inventors

  • LEE, DONG HYUN
  • KIM, HYUNG SIK
  • KIM, KWANG SOO

Dates

Publication Date
20260506
Application Date
20180208

Claims (5)

  1. A secondary battery comprising: a case (110); a first electrode assembly (120A) accommodated inside the case (110) and having first multi-tabs (161, 171); a second electrode assembly (120B) accommodated in parallel with the first electrode assembly (120A) inside the case (110) and having second multi-tabs (162, 172); and a cap plate (130) closing the case (110) and having electrode terminals (140, 150) electrically connected to the first and second multi-tabs (161, 171; 162, 172) of the first and second electrode assemblies (120A, 120B), wherein the first and second multi-tabs (161, 171, 162, 172) are formed so as to be symmetrical with respect to a boundary area (190) between the first and second electrode assemblies (120A, 120B), where the first and second electrode assemblies (120A, 120B) face each other inside the case (110), wherein the first electrode assembly (120A) includes a first winding center (125A), the second electrode assembly (120B) includes a second winding center (125B), the case (110) includes a first long side portion (111) closely contacting the first electrode assembly (120A) and a second long side portion (112) closely contacting the second electrode assembly (120B), the first multi-tab (161, 171) is located between the first winding center (125A) and the first long side portion (111), and the second multi-tab (162, 172) is located between the second winding center (125B) and the second long side portion (112), characterized in that , the first and second multi-tabs (161, 162) are extended to the electrode terminals (140) only from regions closer to the case (110) than to the boundary area (190), respectively, wherein the first and second multi-tabs (161, 162) include first regions (161a, 162a) extended from said regions closer to the case (110) than to the boundary area (190), respectively, second regions (161b, 162b) extended from the first regions (161a, 162a) so as to be adjacent to the case (110), and third regions (161c, 162c) bent from the second regions (161b, 162b) to be connected to the electrode terminal (140), respectively.
  2. A secondary battery comprising: a case (110); a first electrode assembly (120A) accommodated inside the case (110) and having first multi-tabs (261, 271); a second electrode assembly (120B) accommodated in parallel with the first electrode assembly (120A) inside the case (110) and having second multi-tabs (262, 272); and a cap plate (130) closing the case (110) and having electrode terminals (140, 150) electrically connected to the first and second multi-tabs (261, 271; 262, 272) of the first and second electrode assemblies (120A, 120B), wherein the first and second multi-tabs (261, 271, 262, 272) are formed so as to be symmetrical with respect to a boundary area (190) between the first and second electrode assemblies (120A, 120B), where the first and second electrode assemblies (120A, 120B) face each other inside the case (110), wherein the first electrode assembly (120A) includes a first winding center (125A), the second electrode assembly (120B) includes a second winding center (125B), the first multi-tab (261, 271) is located between the first winding center (125A) and the boundary area (190), and the second multi-tab (262, 272) is located between the second winding center (125B) and the boundary area (190), characterized in that , the first and second multi-tabs (261, 262) are extended to the electrode terminals (140) only from regions closer to the boundary area (190) than to the case (110), respectively, wherein the first and second multi-tabs (261, 262) include first regions (261a, 262a) extended from said regions closer to the boundary area (190) than to the case (110), respectively, second regions (261b, 262b) extended from the first regions (261a, 262a) so as to be adjacent to the case (110), and third regions (261c, 262c) bent from the second regions (261b, 262b) to be connected to the electrode terminal (140), respectively.
  3. The secondary battery of claim 1 or claim 2, wherein the first and second electrode assemblies (120A, 120B) further comprise an insulation plate (180) covered by the first and second multi-tabs (161, 162; 261, 262) and the electrode terminals (140), respectively.
  4. The secondary battery of claim 3, when dependent on claim 2, wherein the insulation plate (180) is placed on the first regions (261a) and (262a) of the first and second multi-tabs (261) and (262).
  5. The secondary battery of claim 3, when dependent on claim 1, wherein the insulation plate (180) is placed on the separator (122) of each of the first and second electrode assemblies (120A) and (120B).

Description

[Technical Field] Various embodiments of the present invention relate to a secondary battery having symmetric multi-tabs. [Background Art] A secondary battery is a power storage system that converts electric energy into chemical energy and stores the converted energy to provide high energy density. Unlike primary batteries that cannot be recharged, a secondary battery is rechargeable and is being widely used in IT devices, such as a smart phone, a cellular phone, a notebook computer, or a tablet PC. In recent years, electric vehicles are drawing attention for protection of environmental contamination, and a trend toward the use of high-capacity secondary batteries for electric vehicles is growing. The secondary battery needs to have high density, high output and stability characteristics. The above information disclosed in this Background section is only for enhancement of understanding of the background of the described technology and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art. The EP 3 128 572 A1 discloses a rechargeable battery with an electrode assembly with a fuse part and symmetric current collector tabs. The US 2016/0049635 A1 discloses a rechargeable with two electrode assemblies with symmetric uncoated regions and a current collector member comprising a first current collector member that faces one side of electrode assembly, a second current collector member that contacts electrode uncoated region, and a connecting portion that is shifted toward one side of the first current collector and connects the first and second collectors. The US 2016/0099444 A1 discloses a rechargeable battery with two electrode assemblies and uncoated regions being located at opposite sides of a separator and a first insulating plate between the cap plate and the electrode assembly. The US 2016/0099445 A1 disclose a rechargeable battery with two electrode assemblies and an insulating plate on the electrode assembly and having a protruding portion and internal terminal holes with terminals passing through these holes. [Technical Problems to be Solved] Various embodiments of the present invention provide a secondary battery. That is to say, various embodiments of the present invention provide a secondary battery capable of increasing the insulation level of first and second multi-tabs by forming the first and second multi-tabs of first and second electrode assemblies to be symmetric to each other. [Technical Solutions] In accordance with an aspect of the present invention, there is provided a secondary battery according to claim 1 and claim 2. The first and second multi-tabs may be closer to the case than to the boundary area. The first and second multi-tabs according to claim 1 are extended to the electrode terminals from regions closer to the case than to the boundary area. The first electrode assembly according to claim 1 includes a first winding center, the second electrode assembly includes a second winding center, the case includes a first long side portion closely contacting the first electrode assembly and a second long side portion closely contacting the second electrode assembly, the first multi-tab is located between the first winding center and the first long side portion, and the second multi-tab is located between the second winding center and the second long side portion. The first and second multi-tabs may be located only at regions closer to the boundary area than to the case, respectively. The first and second multi-tabs according to claim 2 are extended to the electrode terminals from regions closer to the boundary area than to the case, respectively. The first and second multi-tabs include first regions extended from the first and second electrode assemblies, second regions extended from the first regions so as to be adjacent to the case, and third regions bent from the second regions to be connected to the electrode terminal, respectively. The first electrode assembly according to claim 2includes a first winding center, the second electrode assembly includes a second winding center, the first multi-tab is located between the first winding center and the boundary area, and the second multi-tab is located between the second winding center and the boundary area. The first and second electrode assemblies may further include insulation plates covered by the first and second multi-tabs and the electrode terminals, respectively. The first and second multi-tabs may include outer multi-tabs located at regions closer to the case than to the boundary area, and inner multi-tabs located at regions closer to boundary area than to the case. [Advantageous Effects] As described above, according to various embodiments of the present invention, a secondary battery is provided. That is to say, according to various embodiments of the present invention, a secondary battery is provided, which can increase the insulation l