CN-122025847-A - Wound electrode body

CN122025847ACN 122025847 ACN122025847 ACN 122025847ACN-122025847-A

Abstract

The present invention relates to a wound electrode body including separators in which 1 st electrode regions and 2 nd electrode regions provided with electrode layers are alternately arranged with a space therebetween. The wound electrode body is formed by winding the separator in a state in which the direction in which the 1 st electrode region and the 2 nd electrode region are arranged is along the winding direction.

Inventors

TATEISHI TAKASHI
UEDA MASASHI
He Quanrun
Mashioka Shizuka
SATO REI
YAMAMOTO YASUNARI
KATAYAMA YUJI
MACHIDA KEITARO

Assignees

丰田自动车株式会社
丰田电池有限公司

Dates

Publication Date: 20260512
Application Date: 20251110
Priority Date: 20241111

Claims (7)

1. A wound electrode body, which comprises a plurality of electrodes, Comprises a separator in which the 1 st electrode region and the 2 nd electrode region provided with electrode layers are alternately arranged with a space therebetween, The separator is wound in a state in which the direction in which the 1 st electrode region and the 2 nd electrode region are aligned is along the winding direction.
2. The rolled electrode body according to claim 1, A1 st electrode layer is provided in the 1 st electrode region, A2 nd electrode layer having a polarity different from that of the 1 st electrode layer is provided in the 2 nd electrode region, The separator has a1 st major face and a2 nd major face, The 1 st electrode layer includes a1 st conductive layer and a1 st active material layer, The 2 nd electrode layer includes a 2 nd conductive layer and a 2 nd active material layer, The 1 st conductive layer and the 1 st active material layer are laminated in this order from the separator side on the 1 st main surface and the 2 nd main surface located in the 1 st electrode region, The 2 nd conductive layer and the 2 nd active material layer are laminated in this order from the separator side on the 1 st main surface and the 2 nd main surface located in the 2 nd electrode region.
3. The rolled electrode body according to claim 2, The 1 st conductive layer has a1 st exposed portion exposed from the 1 st active material layer on one side in a width direction orthogonal to the winding direction, The 2 nd conductive layer has a2 nd exposed portion exposed from the 2 nd active material layer on the one side in the width direction, The wound electrode body further includes: A plurality of 1 st tabs connected to the 1 st exposed portion, and And a plurality of 2 nd tabs connected to the 2 nd exposed portion.
4. The rolled electrode body according to claim 1, A1 st electrode layer and a 2 nd electrode layer having a polarity different from that of the 1 st electrode layer are provided on the 1 st electrode region and the 2 nd electrode region via the separator, The separator has a1 st major face and a2 nd major face, The 1 st electrode layer includes a1 st conductive layer and a1 st active material layer, The 2 nd electrode layer includes a 2 nd conductive layer and a 2 nd active material layer, The 1 st conductive layer and the 1 st active material layer are laminated in this order from the separator side on the 1 st main surface located in the 1 st electrode region and the 1 st main surface located in the 2 nd electrode region, The 2 nd conductive layer and the 2 nd active material layer are laminated in this order from the separator side on the 2 nd main surface located in the 1 st electrode region and the 2 nd main surface located in the 2 nd electrode region.
5. The rolled electrode body according to claim 4, In the 1 st electrode region, the 1 st conductive layer has a1 st exposed portion exposed from the 1 st active material layer on one side in a width direction orthogonal to the winding direction, In the 2 nd electrode region, the 2 nd conductive layer has a2 nd exposed portion exposed from the 2 nd active material layer on the one side in the width direction, The wound electrode body further includes: a plurality of 1 st electrode tabs which are not connected to the 2 nd conductive layer in the 1 st electrode region and are connected to the 1 st exposed portion of the 1 st conductive layer, and And a plurality of 2 nd tabs which are not connected to the 1 st conductive layer in the 2 nd electrode region and are connected to the 2 nd exposed portion of the 2 nd conductive layer.
6. The rolled electrode body according to any one of claim 1 to 5, The length of each of the 1 st electrode region and the 2 nd electrode region along the winding direction increases as going from the inside toward the outside in the winding direction.
7. The rolled electrode body according to any one of claim 1 to 5, The separator has a non-formation region where the electrode layer is not provided between one end portion in the winding direction and the other end portion in the winding direction, and the 1 st electrode region and the 2 nd electrode region, The non-formation region is disposed inside the electrode layer located at the innermost side, between the electrode layers adjacent to each other in the radial direction around the winding axis, and outside the electrode layer located at the outermost side.

Description

Wound electrode body Technical Field The present disclosure relates to a rolled electrode body. Background As a conventional wound electrode body, japanese patent application laid-open No. 2019-096592 discloses a structure in which an electrode member in which a conductive layer and an active material layer are sequentially laminated on the surface of an insulating substrate is used as at least one of a sheet-like positive electrode member and a sheet-like negative electrode member, and a separator is disposed between the positive electrode member and the negative electrode member and wound. The insulating base is provided with a through hole penetrating in the thickness direction. Disclosure of Invention When a sheet-like 1 st electrode member in which a1 st conductive layer and a1 st active material layer are sequentially laminated on an insulating substrate and a sheet-like 2 nd electrode member in which a2 nd conductive layer and a2 nd active material layer are laminated on a metal foil or an insulating substrate are wound with a separator interposed therebetween, the number of components increases. The present disclosure has been made in view of the above-described problems, and an object of the present disclosure is to provide a wound electrode body capable of reducing the number of components. The wound electrode body according to the present disclosure includes separators in which the 1 st electrode region and the 2 nd electrode region provided with electrode layers are alternately arranged with a space therebetween. The separator is wound in a state where the direction in which the 1 st electrode region and the 2 nd electrode region are aligned is along the winding direction. According to the above configuration, the wound electrode body is configured by winding the separator having the electrode layer directly formed thereon, so that the number of components can be reduced. In the wound electrode body according to the present disclosure, the 1 st electrode layer may be provided in the 1 st electrode region, and the 2 nd electrode layer having a polarity different from that of the 1 st electrode layer may be provided in the 2 nd electrode region. The separator may have a1 st principal surface and a 2 nd principal surface. The 1 st electrode layer may include a1 st conductive layer and a1 st active material layer. The 2 nd electrode layer may include a 2 nd conductive layer and a 2 nd active material layer. The 1 st conductive layer and the 1 st active material layer may be laminated on the 1 st main surface and the 2 nd main surface located in the 1 st electrode region in this order from the separator side. The 2 nd conductive layer and the 2 nd active material layer may be laminated in this order from the separator side on the 1 st main surface and the 2 nd main surface located in the 2 nd electrode region. According to the above configuration, in the configuration in which the 1 st electrode layer is formed in the 1 st electrode region and the 2 nd electrode layer is formed in the 2 nd electrode region, the number of components of the wound electrode body can be reduced. In the wound electrode body according to the present disclosure, the 1 st conductive layer may have a1 st exposed portion exposed from the 1 st active material layer on one side in a width direction orthogonal to the winding direction. The 2 nd conductive layer may have a2 nd exposed portion exposed from the 2 nd active material layer on the one side in the width direction. The wound electrode body may further include a plurality of 1 st tabs connected to the 1 st exposed portion and a plurality of 2 nd tabs connected to the 2 nd exposed portion. According to the above configuration, a current can be caused to flow to the 1 st electrode layer and the 2 nd electrode layer via the 1 st electrode tab and the 2 nd electrode tab. In the wound electrode body according to the present disclosure, the 1 st electrode layer and the 2 nd electrode layer having a polarity different from that of the 1 st electrode layer may be provided in each of the 1 st electrode region and the 2 nd electrode region with the separator interposed therebetween. The separator may have a 1 st principal surface and a2 nd principal surface. The 1 st electrode layer may include a 1 st conductive layer and a 1 st active material layer. The 2 nd electrode layer may include a2 nd conductive layer and a2 nd active material layer. The 1 st conductive layer and the 1 st active material layer may be laminated on the 1 st main surface located in the 1 st electrode region and the 1 st main surface located in the 2 nd electrode region from the separator side. The 2 nd conductive layer and the 2 nd active material layer may be laminated in this order from the separator side on the 2 nd main surface located in the 1 st electrode region and the 2 nd main surface located in the 2 nd electrode region. According to the above configuration, in the configuration in which the 1 st el