Battery, manufacturing method of the same, and manufacturing apparatus of the same

Patent metadata

Field	Value
Publication number	US-9293760-B2
Application number	US-201213482218-A
Country	US
Kind code	B2
Filing date	May 29, 2012
Priority date	May 30, 2011
Publication date	Mar 22, 2016
Grant date	Mar 22, 2016

Abstract

A battery includes a positive plate, a negative plate and an insulative separator disposed between the positive plate and the negative plate. Each of the positive plate and the negative plate has a collector and an electrode layer disposed on a surface of the collector. The electrode layer contains an active material. At least one of the positive plate and the negative plate has cracks in a whole area of the electrode layer thereof or at a part of the electrode layer thereof, the part being away from a connector of the one to be coupled to an electrode at least by a predetermined distance. For example, the cracks are formed by drying the electrode layer at a predetermined drying rate.

First claim

What is claimed is:

1. A battery comprising:
a positive plate and a negative plate each having a collector and an electrode layer disposed on at least one surface of the collector, the electrode layer containing an active material; and
an insulative separator disposed between the positive plate and the negative plate, wherein
at least one of the positive plate and the negative plate has a plurality of cracks generated by drying in a whole area of the electrode layer thereof;
the plurality of cracks are disposed such that a maximum mutual distance between adjacent cracks is 2 to 10 times an average particle diameter of the active material;
the plurality of cracks are disposed such that a total length of the plurality of cracks per unit area is 0.1 to 1.0 cm/cm 2 in a planar direction of the at least one of the positive plate and the negative plate; and
all of the plurality of cracks do not extend to the collector.

2. The battery according to claim 1 , wherein the cracks are formed by drying the electrode layer at a predetermined drying rate.

3. The battery according to claim 1 , wherein the cracks include internal cracks disposed in the inside of the electrode layer.

4. The battery according to claim 1 , wherein the electrode layer contains a fibrous conductive material.

5. The battery according to claim 1 , wherein the positive plate, the negative plate and the insulative separator are wound to provide a wound electrode body, and the cracks are formed in the electrode layer located at a site from a center turn of the wound electrode body to a predetermined number of turns of the wound electrode body.

6. The battery according to claim 1 , wherein the positive plate, the negative plate and the insulative separator are stacked to provide a stacked electrode plate, and the cracks are formed in the electrode layer located at a site from a center layer of the stacked electrode body to a predetermined number of layers of the stacked electrode body.

7. A battery comprising:
a positive plate and a negative plate each having a collector and an electrode layer disposed on at least one surface of the collector, the electrode layer containing an active material; and
an insulative separator disposed between the positive plate and the negative plate, wherein
at least one of the positive plate and the negative plate has a plurality of cracks generated by drying at a part of the electrode layer thereof, the part being apart from a connection of the at least one of the positive plate and the negative plate coupled to an electrode at least by a predetermined distance;
the plurality of cracks are disposed such that a maximum mutual distance between the adjacent cracks is 2 to 10 times an average particle diameter of the active material;
the plurality of cracks are disposed such that a total length of the plurality of cracks per unit area is 0.1 to 1.0 cm/cm 2 in a planar direction of the at least one of the positive plate and the negative plate; and
all of the plurality of cracks do not extend to the collector.

8. The battery according to claim 7 , wherein the cracks are formed by drying the electrode layer at a predetermined drying rate.

9. The battery according to claim 7 , wherein the cracks include internal cracks disposed in the inside of the electrode layer.

10. The battery according to claim 7 , wherein the electrode layer contains a fibrous conductive material.

11. The battery according to claim 7 , wherein the positive plate, the negative plate and the insulative separator are wound to provide a wound electrode body, and the cracks are formed in the electrode layer located at a site from a center turn of the wound electrode body to a predetermined number of turns of the wound electrode body.

12. The battery according to claim 7 , wherein the positive plate, the negative plate and the insulative separator are stacked to provide a stacked electrode plate, and the cracks are formed in the electrode layer located at a site from a center layer of the stacked electrode body to a predetermined number of layers of the stacked electrode body.

Assignees

• Shibata Daisuke
• Ikuta Kazuo
• Nakamura Masaya
• Denso Corp

Inventors

• Shibata Daisuke
• Ikuta Kazuo
• Nakamura Masaya

Classifications

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title

• Y10T29/49115

  including coating or impregnating · CPC title

• H01M4/139

  Processes of manufacture · CPC title

• Y02P70/54

  Cross-Sectional Technologies · mapped topic

• H01M10/0436

  Small-sized flat cells or batteries for portable equipment · CPC title