ELECTRICAL ENERGY STORAGE CELL AND ELECTRICAL ENERGY STORAGE MODULE INCLUDING THE SAME

• US 20090136832A1
• Filed: 11/12/2008
• Published: 05/28/2009
• Est. Priority Date: 11/19/2007
• Status: Active Grant

• Current Assignee: Mitsubishi Electric Corporation
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: MITSUDA, Kenro, Takemura, Daigo, Aihara, Shigeru, Hiroi, Osamu
• Granted Patent: US 8,173,289 B2
• Time in Patent Office: Days
• US Class Current: 429/94
• CPC Class Codes: H01G 11/12 Stacked hybrid or EDL capacitors
• CPC Class Codes: H01G 11/18 against thermal overloads, e.g. heating, cooling or ventilating
• CPC Class Codes: H01G 11/28 arranged or disposed on a current collector; Layers or phases between electrodes and current collectors, e.g. adhesives
• CPC Class Codes: H01G 11/52 Separators
• CPC Class Codes: H01G 11/58 Liquid electrolytes
• CPC Class Codes: H01G 11/70 characterised by their structure
• CPC Class Codes: H01G 11/74 Terminals, e.g. extensions of current collectors
• CPC Class Codes: H01G 11/80 Gaskets; Sealings
• CPC Class Codes: H01G 9/10 Sealing, e.g. of lead-in wires
• CPC Class Codes: H01M 10/0431 Cells with wound or folded electrodes H01M10/045 takes precedence
• 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 10/0587 of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
• CPC Class Codes: H01M 50/538 Connection of several leads or tabs of wound or folded electrode stacks
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02E 60/13 Energy storage using capacitors
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

The storage cell comprises a flat roll electrode that includes a strip of positive electrode having a positive electrode current collector foil and a positive electrode layer formed thereon, a strip of negative electrode having an electrode current collector foil and a negative electrode layer formed, and a strip of electrically insulated separator, the strip of positive electrode and the strip of negative electrode being wound into a flat roll configuration with the strip of electrically insulated separator sandwiched therebetween; a sealed casing that hermetically seals the flat roll electrode impregnated with an electrolyte; a positive terminal and a negative terminal each electrically insulated from the sealed casing, connected to the positive current collector foil and the negative current collector foil, respectively.

Claims

1. An electrical energy storage cell, comprising:

a flat roll electrode that includes a strip of positive electrode having a positive electrode current collector foil and a positive electrode layer formed thereon, a strip of negative electrode having an electrode current collector foil and a negative electrode layer formed thereon, and a strip of electrically insulated separator, the strip of positive electrode and the strip of negative electrode being wound into a flat roll configuration with the strip of electrically insulated separator sandwiched therebetween;

a sealed casing that hermetically seals the flat roll electrode impregnated with an electrolyte; and

a positive terminal and a negative terminal each electrically insulated from the sealed casing, connected to the positive current collector foil and the negative current collector foil, respectively;

wherein the positive current collector foil and the negative current collector foil oppositely extend away from the separator along a roll core axis, and each of the foils include edge portions having no positive layer or negative layer formed therewith;

each of the edge portions is configured to include a cutaway portion where part of the edge portions is not existing so that the separator is exposed at the cutaway portion, and a non-cutaway portion constituting portions other than the cutaway portion;

each of the cathode current collector foil and the anode current collector foil is electrically coupled together in a lamination direction at the non-cutaway portions and electrically connected to the positive terminal and the negative terminal, respectively; and

an electrolyte reservoir that makes a contact with the exposed separator is provided at each of the cutaway portions.

2. The electrical energy storage cell of claim 1, wherein the cutaway portion is provided in the middle of each of the edge portions of the cell, to create a non-cutaway portion on each side of the cutaway portion, and positive terminals or negative terminals are provided on each pair of the non-cutaway portions.

3. The electrical energy storage cell of claim 1, wherein the pore diameter of the electrolyte reservoir is larger than that of the separator.

4. The electrical energy storage cell of claim 1, wherein the electrolyte reservoir is configured so as to pass through a roll core axis portion.

6. An electrical energy storage module, comprising:

a plurality of the electrical energy storage cells of claim 2, the storage cells being disposed so that the positive terminal of one of storage cell is closely located to the negative terminal of that adjacent to one of storage cell, the positive terminal being connected to the corresponding negative terminal using an electrically conductive heat dissipation plate.

7. The electrical energy storage module of claim 6, wherein a protection circuit is provided across the cathode and anode terminals of the same electrical energy storage cell.

5. An electrical energy storage cell, comprising:

a flat roll electrode that includes a strip of positive electrode having a positive electrode current collector foil and a positive electrode layer formed thereon, a strip of negative electrode having an electrode current collector foil and a negative electrode layer formed thereon, and a strip of electrically insulated separator, the strip of positive electrode and the strip of negative electrode being wound into a flat roll configuration with the strip of electrically insulated separator sandwiched therebetween;

a sealed casing that hermetically seals the flat roll electrode impregnated with an electrolyte; and

a positive terminal and a negative terminal each electrically insulated from the sealed casing, connected to the positive current collector foil and the negative current collector foil, respectively;

wherein the positive current collector foil and the negative current collector foil oppositely extend away from the separator along a roll core axis, and each of the foils include edge portions having no positive layer or negative layer formed therewith;

each of the cathode current collector foil and the anode current collector foil is electrically coupled together in a lamination direction at the non-cutaway portions and each electrically connected to the cathode terminal and the anode terminal, respectively;

an inter-current-collector-foil electrolyte reservoir are formed on second surfaces of the cathode and the anode current collector foils; and

the pore diameter in the electrolyte reservoir is larger than that of the separator, at least either one of the cathode current collector foil or the anode current collector foil is provided with through-holes.