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EP-4742345-A1 - WOUND ELECTRODE ASSEMBLY

EP4742345A1EP 4742345 A1EP4742345 A1EP 4742345A1EP-4742345-A1

Abstract

A wound electrode assembly (10) includes a separator (110) including a first electrode region (R1) and a second electrode region (R2), in each of which an electrode layer is provided, alternately spaced apart from each other. In the wound electrode assembly (10), the separator (110) is wound with a direction, in which first electrode region (R1) and the second electrode region (R2) are aligned, extending along a winding direction.

Inventors

  • TATEISHI, MITSURU
  • UEDA, MASASHI
  • IZUMI, JUN
  • MASUOKA, SHIZUKA
  • SATO, AYA
  • YAMAMOTO, TATSUYA
  • KATAYAMA, YUJI
  • MACHIDA, Keitaro

Assignees

  • TOYOTA JIDOSHA KABUSHIKI KAISHA

Dates

Publication Date
20260513
Application Date
20251015

Claims (7)

  1. A wound electrode assembly (10, 10X) comprising a separator (110) including a first electrode region (R1) and a second electrode region (R2) alternately spaced apart from each other, an electrode layer being provided in each region, wherein the separator (110) is wound with a direction extending along a winding direction, the first electrode region (R1) and the second electrode region (R2) being aligned in the direction.
  2. The wound electrode assembly (10) according to claim 1, wherein a first electrode layer (200A) is provided in the first electrode region (R1), a second electrode layer (200B) having a polarity different from that of the first electrode layer (200A) is provided in the second electrode region (R2), the separator (110) includes a first main surface (110a) and a second main surface (110b), the first electrode layer (200A) includes a first conductive layer (210A) and a first active material layer (220A), the second electrode layer (200B) includes a second conductive layer (210B) and a second active material layer (220B), on each of the first main surface (110a) and the second main surface (110b) located in the first electrode region (R1), the first conductive layer (210A) and the first active material layer (220A) are stacked in a stated order from a separator (110) side, and on each of the first main surface (110a) and the second main surface (110b) located in the second electrode region (R2), the second conductive layer (210B) and the second active material layer (220B) are stacked in a stated order from the separator (110) side.
  3. The wound electrode assembly (10) according to claim 2, wherein the first conductive layer (210A) includes, on one side in a width direction orthogonal to the winding direction, a first exposed portion (210C) exposed from the first active material layer (220A), the second conductive layer (210B) includes, on the one side in the width direction, a second exposed portion (210D) exposed from the second active material layer (220B), and the wound electrode assembly (10) further comprises: a plurality of first tabs (150A) connected to the first exposed portion (210C); and a plurality of second tabs (150B) connected to the second exposed portion (210D).
  4. The wound electrode assembly (10X) according to claim 1, wherein in each of the first electrode region (R1) and the second electrode region (R2), a first electrode layer (200A) and a second electrode layer (200B) having a polarity different from that of the first electrode layer (200A) are provided with the separator (110) in between, the separator (110) includes a first main surface (110a) and a second main surface (110b), the first electrode layer (200A) includes a first conductive layer (210A) and a first active material layer (220A), the second electrode layer (200B) includes a second conductive layer (210B) and a second active material layer (220B), on each of the first main surface (110a) located in the first electrode region (R1) and the first main surface (110a) located in the second electrode region (R2), the first conductive layer (210A) and the first active material layer (220A) are stacked in a stated order from a separator (110) side, and on each of the second main surface (110b) located in the first electrode region (R1) and the second main surface (110b) located in the second electrode region (R2), the second conductive layer (210B) and the second active material layer (220B) are stacked in a stated order from the separator (110) side.
  5. The wound electrode assembly (10X) according to claim 4, wherein in the first electrode region (R1), the first conductive layer (210A) includes, on one side in a width direction orthogonal to the winding direction, a first exposed portion (210C) exposed from the first active material layer (220A), in the second electrode region (R2), the second conductive layer (210B) has, on the one side in the width direction, a second exposed portion (210D) exposed from the second active material layer (220B), and the wound electrode assembly (10X) further comprises: a plurality of first tabs (150A) connected to the first exposed portion (210C) of the first conductive layer (210A), without being connected to the second conductive layer (210B), in the first electrode region (R1); and a plurality of second tabs (150B) connected to the second exposed portion (210D) of the second conductive layer (210B), without being connected to the first conductive layer (210A), in the second electrode region (R2).
  6. The wound electrode assembly (10, 10X) according to any one of claims 1 to 5, wherein each region of the first electrode region (R1) and the second electrode region (R2) has a length increasing along the winding direction from an inner side to an outer side in the winding direction.
  7. The wound electrode assembly (10, 10X) according to any one of claims 1 to 5, wherein the separator (110) includes a non-formation region (R0) at a first end portion (110c) in the winding direction and at a second end portion (110d) in the winding direction, and between the first electrode region (R1) and the second electrode region (R2), the electrode layer not being provided in the non-formation region (R0), and the non-formation region (R0) is disposed inside the electrode layer located on an innermost side, between a plurality of the electrode layers adjacent to each other in a radial direction centered on a winding axis, and outside the electrode layer located on an outermost side.

Description

CROSS REFERENCE TO RELATED APPLICATIONS This nonprovisional application is based on Japanese Patent Application No. 2024-196684 filed on November 11, 2024 with the Japan Patent Office, the entire contents of which are hereby incorporated by reference. BACKGROUND Field The present disclosure relates to a wound electrode assembly. Description of the Background Art Japanese Patent Laying-Open No. 2019-096592 discloses, as a conventional wound electrode assembly, a structure in which at least one of a sheet-shaped positive electrode member and a sheet-shaped negative electrode member is an electrode member including a conductive layer and an active material layer stacked in the stated order on a surface of an insulating base member, and the positive electrode member and the negative electrode member are wound with a separator in between. The insulating base member has through-holes passing therethrough in a thickness direction. SUMMARY When a sheet-shaped first electrode member including a first conductive layer and a first active material layer stacked in order on an insulating base member and a sheet-shaped second electrode member including a second conductive layer and a second active material layer stacked on a metal foil or an insulating base member are wound with a separator in between, the number of components increases. The present disclosure has been made in view of the above problem. An object of the present disclosure is to provide a wound electrode assembly that can have a reduced number of components. A wound electrode assembly according to the present disclosure includes a separator including a first electrode region and a second electrode region alternately spaced apart from each other, an electrode layer being provided in each region. The separator is wound with a direction, in which the first electrode region and the second electrode region are aligned, extending along a winding direction. With the configuration described above, the wound electrode assembly, which is formed by winding of the separator with the electrode layers directly formed thereon, can have a reduced number of components. In the wound electrode assembly according to the present disclosure, a first electrode layer may be provided in the first electrode region, and a second electrode layer having a polarity different from that of the first electrode layer may be provided in the second electrode region. The separator may include a first main surface and a second main surface. The first electrode layer may include a first conductive layer and a first active material layer. The second electrode layer may include a second conductive layer and a second active material layer. On each of the first main surface and the second main surface located in the first electrode region, the first conductive layer and the first active material layer may be stacked in a stated order from a separator side. On each of the first main surface and the second main surface located in the second electrode region, the second conductive layer and the second active material layer may be stacked in a stated order from the separator side. With the configuration described above, the number of components of the wound electrode assembly can be reduced in the configuration in which the first electrode layer is formed in the first electrode region and the second electrode layer is formed in the second electrode region. In the wound electrode assembly according to the present disclosure, the first conductive layer may include, on one side in a width direction orthogonal to the winding direction, a first exposed portion exposed from the first active material layer. The second conductive layer may include, on the one side in the width direction, a second exposed portion exposed from the second active material layer. The wound electrode assembly may further include a plurality of first tabs connected to the first exposed portion, and a plurality of second tabs connected to the second exposed portion. With the configuration described above, a current can be passed to the first electrode layer and the second electrode layer through the first tabs and the second tabs. In the wound electrode assembly according to the present disclosure, in each of the first electrode region and the second electrode region, a first electrode layer and a second electrode layer having a polarity different from that of the first electrode layer may be provided with the separator in between. The separator may include a first main surface and a second main surface. The first electrode layer may include a first conductive layer and a first active material layer. The second electrode layer may include a second conductive layer and a second active material layer. On each of the first main surface located in the first electrode region and the first main surface located in the second electrode region, the first conductive layer and the first active material layer may be stacked in a stated order fro