Lithium secondary battery comprising individual cells with one another, as well as watches, computers and communication equipment provided with a battery

• US 6,528,204 B1
• Filed: 03/08/2000
• Issued: 03/04/2003
• Est. Priority Date: 09/22/1999
• Status: Expired due to Fees

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Hikmet, Rifat A. M., Feil, Hans
• Primary Examiner(s): Dunn, Tom
• Assistant Examiner(s): JOHNSON, JONATHAN J
• Application Number:
  US09/521,053
• Time in Patent Office: 1,091 Days
• Field of Search: 429/128, 429/127, 429/131, 429/136, 429/139, 429/153, 429/211, 429/217
• US Class Current: 429/128
• 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 10/0454 Cells or batteries with electrodes of only one polarity folded
• 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 4/13 Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
• 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 6/40 Printed batteries , e.g. thin film batteries
• 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

Abstract

A lithium secondary battery (5) comprising individual cells connected with one another, which cells each comprise a negative electrode including negative electrode material (9), a positive electrode including positive electrode material (10), a separator (6) sandwiched between the negative and the positive electrode, and a non-aqueous electrolyte solution between the negative and the positive electrode. The negative and the positive electrode material is provided in segments on the respective current collectors in order to increase the pliability of the battery. Common current collectors (7, 8) are used for all individual cells connected with one another.

Claims

1. A lithium secondary battery comprising individual cells connected with one another, said cells comprising:

a negative electrode comprising a negative electrode material and a negative current collector formed over said negative electrode material;

a positive electrode comprising a positive electrode material and a positive current collector formed over said positive electrode material;

a separator provided between the negative electrode and the positive electrode; and

a non-aqueous electrolyte solution between the negative electrode and the positive electrode;

wherein both the negative current collector and the positive current collector serve as a common current collector for every cell, and wherein the negative electrode material and the positive electrode material are absent from portions of said negative electrode and said positive electrode respectively, the negative current collector, the positive current collector and the separator being in contact with each other at said portions in unfolded position of said battery.

2. A lithium secondary battery comprising individual cells connected with one another, as claimed in claim 1, wherein said separator is common to all the cells for mutual connection between the cells.

3. A lithium secondary battery comprising individual cells connected with one another, as claimed in claim 2, wherein the electrode material provided in segments on the current collector extends substantially throughout the width of the relevant current collector.

4. A lithium secondary battery comprising individual cells connected with one another, as claimed in claim 1, wherein each of the segments do not border another one of the segments.

5. A lithium secondary battery comprising individual cells connected with one another, as claimed in claim 1, wherein carbon or graphite is used as the negative electrode material.

6. A lithium secondary battery comprising individual cells connected with one another, as claimed in claim 1, wherein the positive electrode material is selected from lithium transition metal oxides, including LiMn2O4, LiCoO2 or LiNiO2, which material comprises electroconductive particles, including carbon or graphite, and binder material.

7. A lithium secondary battery comprising individual cells connected with one another, as claimed in claim 1, wherein the negative electrode material, the positive electrode material and the separator are provided with a pattern of apertures, said apertures being filled with a filling material which holds together the negative electrode, the positive electrode and the separator.

8. A lithium secondary battery comprising individual cells connected with one another, as claimed in claim 7, wherein the filling material is a bonding agent.

9. A lithium secondary battery comprising individual cells connected with one another, as claimed in claim 7, wherein the filling material is polyethene.

10. A lithium secondary battery comprising individual cells connected with one another, as claimed in claim 1, wherein the individual cells are provided in an envelope of a laminate, which envelope is hermetically sealed.

11. A lithium secondary battery comprising individual cells connected with one another, as claimed in claim 1, wherein the cell is composed of a stack of cells comprising a negative electrode, a positive electrode, a separator and a non-aqueous electrolyte.

12. A lithium battery comprising cells connected with one another, each of said cells comprising:

a negative electrode comprising a negative electrode material and a negative current collector formed over said negative electrode material;

a positive electrode comprising a positive electrode material and a positive current collector formed over said positive electrode material;

a separator provided between the negative electrode and the positive electrode; and

an electrolyte located between the negative electrode and the positive electrode;

wherein the negative current collector and the positive current collector serve as common current collectors for said cells, and wherein the negative electrode material and the positive electrode material are absent from portions of said negative electrode and said positive electrode respectively, the negative current collector, the positive current collector and the separator being in contact with each other at said portions in an unfolded position of said battery.