Lithium secondary cell and lithium secondary cell connecting structure

• US 20020136944A1
• Filed: 03/12/2002
• Published: 09/26/2002
• Est. Priority Date: 03/21/2001
• Status: Active Grant

• Current Assignee: NGK Insulators Limited
• Original Assignee: NGK Insulators Limited
• Inventors: Nemoto, Hiroshi, Nemoto, Kenshin
• Granted Patent: US 6,767,666 B2
• Time in Patent Office: Days
• US Class Current: 429/120
• CPC Class Codes: H01M 10/052 Li-accumulators
• 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 10/613 Cooling or keeping cold
• CPC Class Codes: H01M 10/625 Vehicles
• CPC Class Codes: H01M 10/643 Cylindrical cells
• CPC Class Codes: H01M 10/651 characterised by parameters specified by a numeric value or mathematical formula, e.g. ratios, sizes or concentrations
• CPC Class Codes: H01M 10/6551 Surfaces specially adapted for heat dissipation or radiation, e.g. fins or coatings
• CPC Class Codes: H01M 10/6561 Gases
• CPC Class Codes: H01M 10/6567 Liquids
• CPC Class Codes: H01M 10/6572 Peltier elements or thermoelectric devices
• CPC Class Codes: H01M 50/50 Current conducting connections for cells or batteries
• CPC Class Codes: H01M 50/548 on opposite sides of the cell
• CPC Class Codes: H01M 50/55 on the same side of the cell
• CPC Class Codes: H01M 50/553 Terminals adapted for prismatic, pouch or rectangular cells
• CPC Class Codes: H01M 50/559 Terminals adapted for cells having curved cross-section, e.g. round, elliptic or button cells H01M50/553 takes precedence
• CPC Class Codes: H01M 6/10 with wound or folded electrodes
• CPC Class Codes: H01M 6/42 Grouping of primary cells into batteries H01M6/40 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
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries

Abstract

The present invention provides a lithium secondary cell including an inner electrode body impregnated with a non-aqueous electrolyte, made up of a positive electrode and a negative electrode wound or laminated together with a separator inserted in between, an cell case that contains the inner electrode body and an electrode cover that seals the inner electrode body provided with cell covers, external terminals and internal terminals. The lithium secondary cell is provided with a unit for cooling the electric current path. The lithium secondary cell is capable of preventing a lowering of performance and extending the service life by preventing heating of the lithium secondary cell and maintaining temperature within an adequate range.

Claims

1. A lithium secondary cell comprising:

an inner electrode body impregnated with a non-aqueous electrolyte, made up of a positive electrode and a negative electrode wound or laminated together with a separator inserted in between;

an cell case that contains said inner electrode body; and

an electrode cover that seals said inner electrode body provided with an cell cover, external terminals and internal terminals,

wherein said lithium secondary cell is provided with a means for cooling an electric current path.

2. The lithium secondary cell according to claim 1, wherein said electric current path includes said external terminals.

5. The lithium secondary cell according to claim 1, which has a capacity of 2 Ah or more.

6. The lithium secondary cell according to claim 1, which is to be mounted on a vehicle.

7. The lithium secondary cell according to claim 6, which is to be used to start an engine.

8. The lithium secondary cell according to claim 6, which is used for an electric vehicle or hybrid electric vehicle.

3. A lithium secondary cell comprising:

an inner electrode body impregnated with a non-aqueous electrolyte, made up of a positive electrode and a negative electrode wound so as to surround an outer wall of a core with a separator inserted in between, and

a cylindrical cell case that coaxially contains said inner electrode body;

wherein a heat conductivity ratio (X/Y) of a heat conductivity (X) in a direction of the center axis to a heat conductivity (Y) in a direction of a diameter of said lithium secondary cell is 50 or more.

4. The lithium secondary cell according to claim 3, wherein said heat conductivity ratio (X/Y) is 100 or more.

9. A lithium secondary cell connecting structure comprising:

a plurality of lithium secondary cells connected in series and/or in parallel by means of a bus bar, each of said lithium secondary cells comprising;

an inner electrode body impregnated with a non-aqueous electrolyte, made up of a positive electrode and a negative electrode wound or laminated together with a separator inserted in between;

an cell case that contains said inner electrode body; and

an electrode cover that seals said inner electrode body provided with an cell cover, external terminals and internal terminals,

wherein said lithium secondary cell connecting structure is provided with a means for cooling the electric current path.

10. The lithium secondary cell connecting structure according to claim 9, wherein said electric current path includes said bus bar.

11. The lithium secondary cell connecting structure according to claim 9, wherein said lithium secondary cell has a capacity of 2 Ah or more.

12. The lithium secondary cell connecting structure according to claim 9, which is to be mounted on a vehicle.

13. The lithium secondary cell connecting structure according to claim 12, which is to be used to start an engine.

14. The lithium secondary cell connecting structure according to claim 12, which is used for an electric vehicle or hybrid electric vehicle.