Lithium-ion battery including electrode with tab section having substrate-exposed portion

Patent metadata

Field	Value
Publication number	US-11444271-B2
Application number	US-201816640208-A
Country	US
Kind code	B2
Filing date	Nov 2, 2018
Priority date	Nov 14, 2017
Publication date	Sep 13, 2022
Grant date	Sep 13, 2022

Abstract

A battery includes an electrode assembly having a positive electrode and a negative electrode. The positive electrode includes a positive electrode substrate, a positive electrode active material layer formed on the surface of the positive electrode substrate, and a positive tab section having a substrate-exposed portion in which the positive electrode active material layer is not formed on the surface. The positive electrode active material layer has a notch in the end of the positive electrode active material layer. The outer edge of the notch encloses an end of a boundary where the positive tab section and the positive electrode active material layer come into contact.

First claim

The invention claimed is:

1. A lithium-ion battery comprising an electrode assembly including a first electrode and a second electrode, wherein:
the first electrode includes a substrate, a first active material layer formed on a surface of the substrate, and a first tab section having a substrate-exposed portion in which the first active material layer is not formed on the surface;
the first active material layer has one or more notches in an end of the first active material layer; and
an outer edge of the notches encloses an end of a boundary where the first tab section and the first active material layer come into contact,

wherein
in the electrode assembly, a terminal edge of the notches on a side of the first tab section is placed at a position that does not overlap a second active material layer of the second electrode when viewed from a stacking direction of the first electrode and the second electrode.

2. The lithium-ion battery according to claim 1 , wherein the notches are in an end of the first tab section.

3. The lithium-ion battery according to claim 1 , wherein a contact portion of the outer edge of the notches with the first active material layer has a circular arc or an elliptical arc when viewed from the stacking direction of the first electrode and the second electrode.

4. The lithium-ion battery according to claim 1 , wherein the substrate is an aluminum foil or an aluminum alloy foil.

5. The lithium-ion battery according to claim 1 , wherein the notches are at both ends of the boundary.

6. The lithium-ion battery according to claim 1 , wherein:
the first electrode is a positive electrode and the second electrode is a negative electrode; and
the first active material layer has a filling density of an active material of 3.5 g/cm 3 or more.

Assignees

• Panasonic Corp
• Sanyo Electric Co
• Panasonic Holdings Corp

Inventors

• Kamiyama Yuma
• Iwata Ryosuke
• SHIOZAKI Katsuya

Classifications

• H01M50/55

  on the same side of the cell · CPC title

• H01M50/176

  for prismatic or rectangular cells (H01M50/181 takes precedence) · CPC title

• H01M4/661

  Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence) · CPC title

• H01M10/0525 Primary

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

• H01M10/054

  Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium · CPC title