Solid state battery

• US 20040234847A1
• Filed: 03/12/2004
• Published: 11/25/2004
• Est. Priority Date: 03/14/2003
• Status: Abandoned Application

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Ishii, Hironori, Mino, Shinji
• Application Number:
  US10/798,887
• Publication Number:
  US 20040234847A1
• Time in Patent Office: Days
• US Class Current: 429/175
• CPC Class Codes: H01M 50/109 of button or coin shape
• CPC Class Codes: H01M 50/11 having a chip structure, e.g. micro-sized batteries integrated on chips
• CPC Class Codes: H01M 50/117 Inorganic material
• CPC Class Codes: H01M 50/119 Metals
• CPC Class Codes: H01M 50/121 Organic material
• CPC Class Codes: H01M 50/14 for protecting against damage caused by external factors
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

A solid state battery comprising: a substrate; a power-generating element comprising a lower current collector layer, a lower electrode layer, an electrolyte layer, an upper electrode layer and an upper current collector layer laminated in this order on the substrate; and a protective film covering at least side faces of the power-generating element, wherein at least one portion of the protective film has a stepless smooth surface, the portion extending from an upper part covering an edge of the upper current collector layer to a lower end part contacting with the substrate, and an acute angle θ formed between the surface of the substrate and a shortest oblique line is not greater than 70 degrees, the oblique line extending from a point on the edge of the upper current collector layer to a point on the outer perimeter of the interface between the lower end part and the substrate.

Claims

1. A solid state battery comprising:

a substrate;

a power-generating element comprising a lower current collector layer, a lower electrode layer, an electrolyte layer, an upper electrode layer and an upper current collector layer laminated in this order on said substrate; and

a protective film covering at least side faces of said power-generating element,

wherein at least one portion of said protective film has a stepless smooth surface, said portion extending from an upper part covering an edge of said upper current collector layer to a lower end part contacting with said substrate, and an acute angle θ

formed between the surface of said substrate and a shortest oblique line is not greater than 70 degrees, said oblique line extending from a point on said edge of said upper current collector layer to a point on the outer perimeter of the interface between said lower end part and said substrate.

2. The solid state battery in accordance with claim 1, wherein said protective film comprises at least one selected from the group consisting of silicon oxide, silicon nitride, silicon carbide, tantalum oxide, aluminum oxide, titanium oxide and a resin.

3. The solid state battery in accordance with claim 1, further comprising an electric lead connected to said power-generating element and disposed on said smooth surface of the protective film.