Non-aqueous secondary battery and its control method

• US 20060251955A1
• Filed: 07/14/2006
• Published: 11/09/2006
• Est. Priority Date: 05/20/1998
• Status: Active Grant

• Current Assignee: Kri, Inc. (Osaka Gas Company Limited)
• Original Assignee: Hajime Kinoshita, Haruo Kikuta, Hiroyuki Tajiri, Shiro Kato, Shizukuni Yata
• Inventors: Yata, Shizukuni, Kato, Shiro, Tajiri, Hiroyuki, Kinoshita, Hajime, Kikuta, Haruo
• Granted Patent: US 7,642,001 B2
• Time in Patent Office: Days
• US Class Current: 429/50
• CPC Class Codes: H01M 10/0413 Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes
• CPC Class Codes: H01M 10/0436 Small-sized flat cells or batteries for portable equipment
• CPC Class Codes: H01M 10/0468 Compression means for stacks of electrodes and separators
• CPC Class Codes: H01M 10/0525 Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• 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 10/42 Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells H01M10/60 takes precedence
• CPC Class Codes: H01M 10/48 Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569
• CPC Class Codes: H01M 10/486 for measuring temperature
• CPC Class Codes: H01M 10/613 Cooling or keeping cold
• CPC Class Codes: H01M 10/625 Vehicles
• CPC Class Codes: H01M 10/647 Prismatic or flat cells, e.g. pouch cells
• CPC Class Codes: H01M 2004/021 Physical characteristics, e.g. porosity, surface area
• CPC Class Codes: H01M 2004/027 Negative electrodes
• 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 4/505 of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
• CPC Class Codes: H01M 4/583 Carbonaceous material, e.g. graphite-intercalation compounds or CFx
• CPC Class Codes: H01M 4/587 for inserting or intercalating light metals
• CPC Class Codes: H01M 50/103 prismatic or rectangular H01M50/109, H01M50/11 take precedence
• CPC Class Codes: H01M 50/417 Polyolefins
• CPC Class Codes: H01M 50/44 : Fibrous material
• CPC Class Codes: H01M 50/454 : comprising a non-fibrous layer and a fibrous layer superimposed on one another
• CPC Class Codes: H01M 50/46 : Separators, membranes or diaphragms characterised by their combination with electrodes
• CPC Class Codes: H01M 50/491 : Porosity
• CPC Class Codes: H01M 50/55 : on the same side of the cell
• CPC Class Codes: H01M 50/562 : characterised by the material
• CPC Class Codes: H01M 50/566 : by welding, soldering or brazing
• 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

The invention provides a non-aqueous secondary battery having positive and negative electrodes and non-aqueous electrolyte containing lithium salt which has an energy capacity of 30 Wh or more, a volume energy density of 180 Wh/l or higher, which battery has a flat shape and is superior in heat radiation characteristic, used safely and particularly preferably used for a energy storage system. The invention also provides a control method of the secondary battery.

Claims

1. A secondary-battery control method comprising the steps of:

providing a secondary battery comprising at least one positive electrode and at least one negative electrode which is made of a material capable of being doped or undoped with lithium, and a liquid or gel electrolyte containing lithium salt and an organic solvent, the battery being at least 30 Wh in energy capacity and at least 180 Wh/l in volume energy density and having a flat shape with a thickness of less than 12 mm and not less than 2 mm;

measuring operational parameters at different portions of the battery; and

controlling operations of the battery based on the results of the measurement.

2. The secondary-battery control method according to claim 1, wherein the operational parameters to be measured include at least one of voltage, tension of current, temperature, dimensions, and internal resistance of the secondary battery.

3. The secondary-battery control method according to claim 1, wherein charge and discharge conditions and resting conditions of the battery, battery temperatures adjusted by heating or cooling, and pressure against the battery case are controlled based on the results of the measurement.

4. The secondary-battery control method according to claim 1, wherein the positive electrode contains manganese oxide.

5. The secondary-battery control method according to claim 1, wherein the negative electrode comprises as active material double-structure graphite particles formed with graphite-based particles and amorphous carbon layers covering the surface of the graphite-based particles, the graphite-based particles having (d002) spacing of (002) planes of not more than 0.34 nm as measured by X-ray wide-angle diffraction method, the amorphous carbon layers having (d002) spacing of (002) planes of 0.34 nm or higher.

6. The secondary-battery control method according to claim 4, wherein the negative electrode comprises as active material double-structure graphite particles formed with graphite-based particles and amorphous carbon layers covering the surface of the graphite-based particles, the graphite-based particles having (d002) spacing of (002) planes of not more than 0.34 nm as measured by X-ray wide-angle diffraction method, the amorphous carbon layers having (d002) spacing of (002) planes of 0.34 nm or higher.

7. The secondary-battery control method according to claim 1, wherein the negative electrode comprises as active material a carbon material manufactured by mixing at least one of artificial graphite and natural graphite with a carbon material having volatile components on the surface and/or in the inside and baking the mixture.

8. The secondary-battery control method according to claim 4, wherein the negative electrode comprises as active material a carbon material manufactured by mixing at least one of artificial graphite and natural graphite with a carbon material having volatile components on the surface and/or in the inside and baking the mixture.

9. The secondary-battery control method according to claim 1, wherein the front and rear sides of the flat shape are rectangular.

10. The secondary-battery control method according to claim 1, wherein the wall thickness of a battery case of the non-aqueous secondary battery is not less than 0.2 mm and not more than 1 mm.

11. The secondary-battery control method according to claim 1, wherein the wall thickness of a battery case of the non-aqueous secondary battery is not less than 0.2 mm and not more than 0.7 mm.