Electrode group for thin batteries, thin battery, and electronic device

• US 9,088,050 B2
• Filed: 08/28/2012
• Issued: 07/21/2015
• Est. Priority Date: 08/29/2011
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: Ueda, Tomohiro
• Primary Examiner(s): Fraser, Stewart
• Application Number:
  US13/880,901
• Publication Number:
  US 20130260214A1
• Time in Patent Office: 1,057 Days
• Field of Search: 429/162
• US Class Current: 1/1
• CPC Class Codes: A61N 1/303 Constructional details electrodes for external use A61N1/0428
• CPC Class Codes: H01M 10/0436 Small-sized flat cells or batteries for portable equipment
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/0585 of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
• CPC Class Codes: H01M 2004/021 Physical characteristics, e.g. porosity, surface area
• CPC Class Codes: H01M 4/131 Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
• CPC Class Codes: H01M 4/133 Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
• CPC Class Codes: H01M 4/134 Electrodes based on metals, Si or alloys
• CPC Class Codes: H01M 4/382 Lithium H01M4/405 takes precedence
• CPC Class Codes: H01M 4/405 Alloys based on lithium
• CPC Class Codes: H01M 4/505 of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
• CPC Class Codes: H01M 4/525 of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
• CPC Class Codes: H01M 4/587 for inserting or intercalating light metals
• CPC Class Codes: H01M 50/119 Metals
• CPC Class Codes: H01M 50/121 Organic material
• CPC Class Codes: H01M 50/129 with two or more layers of only organic material
• CPC Class Codes: H01M 50/133 Thickness
• CPC Class Codes: H01M 50/136 Flexibility or foldability
• CPC Class Codes: H01M 6/16 with organic electrolyte H01M6/18 takes precedence
• 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

Provided is a high-capacity and highly-flexible electrode group for thin batteries, a thin battery including the electrode group, and an electronic device in which the thin battery is incorporated.

The electrode group for thin batteries includes: a sheet-like first electrode, a sheet-like second electrode being laminated on each of both surfaces of the first electrode, and an electrolyte layer interposed between the first electrode and the second electrode. The second electrode has a polarity opposite to that of the first electrode. The second electrode has a flexural modulus lower than that of the first electrode. The thin battery includes the electrode group, and a pouch-like housing accommodating the electrode group. The electronic device includes an electronic device main body with flexibility, and the thin battery is incorporated in the electronic device main body.

Claims

1. An electrode group for thin batteries comprising:

a sheet-like first electrode;

a sheet-like second electrode disposed over each of both surfaces of the first electrode, and having a polarity opposite to a polarity of the first electrode; and

an electrolyte layer interposed between the first electrode and the second electrode,

the second electrode having a flexural modulus lower than a flexural modulus of the first electrode.

2. The electrode group for thin batteries according to claim 1, wherein a thickness of the electrode group is 700 μ

m or less, the flexural modulus of the first electrode is 100 MPa or more and 2000 MPa or less, and the flexural modulus of the second electrode is 20 MPa or more and 650 MPa or less.

3. The electrode group for thin batteries according to claim 1, wherein the first electrode is a positive electrode, and the second electrode is a negative electrode.

4. The electrode group for thin batteries according to claim 3, wherein:

the first electrode has a positive electrode current collector, and a positive electrode active material layer formed on each of both surfaces of the positive electrode current collector, the positive electrode active material layer including manganese dioxide;

the second electrode has a negative electrode current collector, and a negative electrode active material layer formed on one surface of the negative electrode current collector, the negative electrode active material layer including lithium or a lithium alloy; and

the second electrode is disposed over each of both surfaces of the first electrode such that the negative electrode active material layer faces the positive electrode active material layer.

5. The electrode group for thin batteries according to claim 1, wherein the flexural modulus of the first electrode is 100 MPa or more and 2000 MPa or less, and the flexural modulus of the second electrode is 20 MPa or more and 650 MPa or less.

6. A thin battery comprising an electrode group, and a pouch-like housing accommodating the electrode group,

the electrode group comprising:

a sheet-like first electrode;

a sheet-like second electrode disposed over each of both surfaces of the first electrode, and having a polarity opposite to a polarity of the first electrode; and

an electrolyte layer interposed between the first electrode and the second electrode,

the second electrode having a flexural modulus lower than a flexural modulus of the first electrode, and

a sum of a thickness of the electrode group and a thickness of the housing being 1.0 mm or less.

7. The thin battery according to claim 6, wherein a thickness of the electrode group is 700 μ

m or less, the flexural modulus of the first electrode is 100 MPa or more and 2000 MPa or less, and the flexural modulus of the second electrode is 20 MPa or more and 650 MPa or less.

8. The thin battery according to claim 6, wherein the flexural modulus of the first electrode is 100 MPa or more and 2000 MPa or less, and the flexural modulus of the second electrode is 20 MPa or more and 650 MPa or less.

9. An electronic device comprising an electronic device main body with flexibility, and a thin battery incorporated in the electronic device main body,

the thin battery comprising an electrode group, and a pouch-like housing accommodating the electrode group, and

the electrode group comprising:

a sheet-like first electrode;

a sheet-like second electrode disposed over each of both surfaces of the first electrode, and having a polarity opposite to a polarity of the first electrode; and

an electrolyte layer interposed between the first electrode and the second electrode,

the second electrode having a flexural modulus lower than a flexural modulus of the first electrode.

10. The electronic device according to claim 9, wherein the electronic device main body is a device that operates in contact with the skin of a human body.

11. The electronic device according to claim 9, wherein a thickness of the electrode group is 700 μ

m or less, the flexural modulus of the first electrode is 100 MPa or more and 2000 MPa or less, and the flexural modulus of the second electrode is 20 MPa or more and 650 MPa or less.

12. The electronic device according to claim 9, wherein the flexural modulus of the first electrode is 100 MPa or more and 2000 MPa or less, and the flexural modulus of the second electrode is 20 MPa or more and 650 MPa or less.