Electrode assembly and manufacturing method therefor

Patent metadata

Field	Value
Publication number	US-11233296-B2
Application number	US-201716320672-A
Country	US
Kind code	B2
Filing date	Jul 20, 2017
Priority date	Jul 26, 2016
Publication date	Jan 25, 2022
Grant date	Jan 25, 2022

Abstract

A purpose of the present invention is to provide an electrode assembly and a manufacturing method therefor that can favorably suppress a short circuit that is due to a burr created by punching. At least one of the cathode 11 and the anode 12 of the electrode assembly of the present invention is covered with an insulating layer. The cathode 11 and the anode 12 are oriented such that the burr 11 b of the cathode 11 and the burr 12 b of the anode 12 of the opposing cathode 11 and the opposing anode 12 close to at least the outer peripheral edge of the cathode 11 and the outer peripheral edge of the anode 12 do not face each other 12 are opposed to each other.

First claim

The invention claimed is:

1. An electrode assembly for a battery, including:
a plurality of cathodes, each including a cathode current collector and a cathode active material layer formed in a predetermined area on at least one side of the cathode current collector, having a burr formed by a punching process, and formed in a predetermined shape; and
a plurality of anodes, each including an anode current collector and an anode active material layer formed in a predetermined area on at least one side of the anode current collector, having a burr formed by a punching process, and formed in a predetermined shape,
wherein
a plurality of the cathodes and a plurality of anodes are laminated so that the cathodes and the anodes face each other,
at least one of the plurality of the cathodes and the plurality of the anodes further include insulation layers formed covering the cathode active material layers or the anode active material layers, and
at sections of the facing cathodes and anodes where at least peripheral edges of the cathodes and peripheral edges of the anodes are adjacent, the cathodes and the anodes are facingly positioned in orientations such that the burrs of the cathodes and the burrs of the anodes do not face one another, and
at sections where the peripheral edges of the cathodes and the peripheral edges of the anodes are adjacent, the heights of the burrs are smaller than the other sections.

2. The electrode assembly according to claim 1 , the cathodes and the anodes are facingly positioned in such a manner to have the insulation layers of at least one of the cathodes and the anodes between the cathode active material layers and the anode active material layers.

3. The electrode assembly according to claim 1 , wherein
in the cathodes, the cathode current collectors have extended portions extending from areas where the cathode active material layers are formed, and,
in the anodes the anode current collectors have extended portions extending from areas where the anode active material layers are formed, and
extended portions of the cathodes and extended portions of the anodes are formed at positions where the extended portions do not overlap each other when viewed from a direction in which the cathodes and the anodes face.

4. The electrode assembly according to claim 3 , wherein, the peripheral edges of the cathodes and the peripheral edges of the anodes are adjacent at sections where the peripheral edges of the cathode and the peripheral edges of the anodes cross at the extended portions of the cathodes or the extended portion of the anodes.

5. A battery including:
the electrode assembly according to claim 1 ;
an electrolyte; and
a packaging body for sealing the electrode assembly and the electrolyte.

6. A method of manufacturing an electrode assembly for a battery, including:
a process of preparing a cathode including a cathode current collector and a cathode active material layer formed in a predetermined area on at least one side of the cathode current collector; and
a process of preparing an anode including an anode current collector and an anode active material layer formed in a predetermined area on at least one side of the anode current collector, wherein
at least one of the cathode and the anode further includes an insulation layer that is formed covering the active material layer, and further including:
a process of forming the cathode in a predetermined shape by punching;
a process of forming the anode in a predetermined shape by punching; and,
a process of facingly positioning, at a section of the facing cathode and anode where at least a peripheral edge of the cathode and a peripheral edge of the anode are adjacent, the cathode and the anode in an orientation such that burrs created by the punching do not face one another,
wherein,
the process of forming the cathode in a predetermined shape includes: performing a first punching process for forming the cathode in a predetermined shape; and performing thereafter, in a section adjacent to the peripheral edge of the anode, a second punching process in such a manner that creation of the burr is suppressed as compared with the first punching process, and/or
the process of forming the anode in a predetermined shape includes: performing a first punching process for forming the anode in a predetermined shape; and performing thereafter, in a section adjacent to the peripheral edge of the cathode, a second punching process in such a manner that creation of the burr is suppressed as compared with the first punching process.

7. The method of manufacturing an electrode assembly according to claim 6 , wherein the process of facingly positioning the cathode and the anode includes facingly positioning the cathode and the anode in such a manner to have the insulation layer of at least one of the cathode and the anode between the cathode active material layer and the anode active material layer.

8. The method of manufacturing an electrode assembly according to claim 6 , wherein
the process of forming the cathode in a predetermined shape includes forming the cathode by punching in such a manner that the cathode current collector has an extended portion extending from a region where the cathode active material layer is formed, and
the process of forming an anode in a predetermined shape includes forming the anode by punching at a position where the extended portion of the cathode does not overlap when viewed from a direction in which the cathode and the anode face in such a manner that the anode current collector includes an extended portion extending from a region where the anode active material layer is formed.

9. The method of manufacturing an electrode assembly according to claim 8 , the process of facingly positioning the cathode and the anode includes facingly positioning the cathode and the anode in such a manner that the peripheral edge of the cathode and the peripheral edge of the anode are adjacent at a section where the peripheral edge of the cathode and the peripheral edge of the anode cross at the extended portion of the cathode or the extended portion of the anode.

Assignees

• Nec Corp

Inventors

• Otohata Makihiro

Classifications

• H01M4/04 Primary

  Processes of manufacture in general · CPC title

• H01M50/533

  characterised by the shape of the leads or tabs · CPC title

• H01M50/536

  characterised by the method of fixing the leads to the electrodes, e.g. by welding · CPC title

• H01M50/534

  characterised by the material of the leads or tabs · CPC title

• H01M4/366

  as layered products · CPC title