Non-aqueous electrolyte secondary battery

Patent metadata

Field	Value
Publication number	US-2025201801-A1
Application number	US-202318847374-A
Country	US
Kind code	A1
Filing date	Mar 15, 2023
Priority date	Mar 22, 2022
Publication date	Jun 19, 2025
Grant date	—

Abstract

A non-aqueous electrolyte secondary battery including a negative electrode plate with a negative electrode core body, and a negative electrode mixture layer formed on the surface of the negative electrode core body. At an end portion of the negative electrode core body on one side in an electrode plate width direction there is formed a core body exposed portion along the longitudinal direction of the electrode plate, the core body exposed portion being electrically connected to an outer package can. The surface of the negative electrode core body includes a first region other than the end portion on the one side in the electrode plate width direction, and a second region that is the end portion on the one side. The relationship Ra1>Ra2 holds, where Ra1 represents the arithmetic average roughness of the first region, and Ra2 represents the arithmetic average roughness of the second region.

First claim

1 . A non-aqueous electrolyte secondary battery, comprising:
a wound-type electrode assembly including a belt-shaped positive electrode plate and a belt-shaped negative electrode plate wound together with a separator interposed between the positive and negative electrode plates; and an exterior can that houses the electrode assembly and a non-aqueous electrolyte solution, wherein the negative electrode plate includes: a negative electrode core; and a negative electrode mixture layer provided on a surface of the negative electrode core, an end portion on one side in an electrode-plate width direction of the negative electrode core is provided with a core exposed portion along an electrode-plate longitudinal direction, the core exposed portion is electrically connected to the exterior can, the surface of the negative electrode core includes a first area that is an area other than the end portion on the one side in the electrode-plate width direction, and a second area that is an area of the end portion on the one side, and Ra1>Ra2 is satisfied, where Ra1 represents an arithmetic mean roughness of the first area, and Ra2 represents an arithmetic mean roughness of the second area.

2 . The non-aqueous electrolyte secondary battery according to claim 1 , wherein Ra1/Ra2≥1.2 is satisfied.

Assignees

• Panasonic Energy Co Ltd

Inventors

• Nakai Yuki
• Hashimoto Tetsu

Classifications

• H01M10/0431

  Cells with wound or folded electrodes (H01M10/045 takes precedence) · CPC title

• H01M4/13 Primary

  Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M2004/021

  Physical characteristics, e.g. porosity, surface area · CPC title