Electrochemical multi-cell and method therefor

Patent metadata

Field	Value
Publication number	US-2016336547-A1
Application number	US-201515110729-A
Country	US
Kind code	A1
Filing date	Jan 9, 2015
Priority date	Jan 9, 2014
Publication date	Nov 17, 2016
Grant date	—

Abstract

An electrochemical storage multi-cell may comprise: a housing, including a plurality of concentric annular cell chambers; a plurality of electrochemical storage cells, wherein each of the plurality of annular cells are positioned in one of the plurality of annular cell chambers, and the plurality of annular cells are electrically connected in series; and conductive electrolyte filling each of the annular cell chambers.

First claim

1 . An electrochemical storage multi-cell, comprising:
a housing, including a plurality of concentric annular cell chambers; a plurality of electrochemical storage cells, wherein each of the plurality of annular cells are positioned in one of the plurality of annular cell chambers, and the plurality of annular cells are electrically connected in series; and a conductive electrolyte filling each of the annular cell chambers.

2 . The electrochemical storage multi-cell of claim 1 , wherein each of the plurality of annular cell chambers comprises:
first and second electrode sheets wound around a cylindrical core forming a jellyroll structure, the first and second electrode sheets each comprising uncoated conductive edges parallel to end faces of the jellyroll structure, and coated opposing surfaces between the uncoated conductive edges; and first and second separator sheets mechanically and electrically separating the coated opposing surfaces of the first and second electrode sheets and mechanically and electrically separating the cylindrical core and the coated opposing surfaces of the first electrode sheet, wherein the uncoated conductive edges include tabs formed by cutting out portions of the uncoated conductive edges between the tabs, the tabs protruding axially outward, and the tabs being angularly co-located relative to the cylindrical core upon forming the jellyroll structure.

3 . The electrochemical storage multi-cell of claim 2 , wherein the cylindrical core comprises a plastic core.

4 . The electrochemical storage multi-cell of claim 2 , further comprising:
compressed angularly co-located tabs of the uncoated conductive edges, wherein the compressed angularly co-located tabs are electrically connected to each other.

5 . The electrochemical storage multi-cell of claim 1 , wherein the housing includes exactly four concentric annular cell chambers.

6 . The electrochemical storage multi-cell of claim 1 , further comprising a cover, wherein each of the plurality of cell chambers are fluidly isolated with the cover affixed to the housing.

7 . A method for an electrochemical storage multi-cell, comprising:
positioning each of a plurality of electrochemical storage cells in concentric annular chambers of a housing, the number of the concentric annular chambers corresponding to the plurality of electrochemical storage cells; electrically connecting each of the plurality of electrochemical storage cells in series; wherein each of the annular cell chambers are filled with conductive electrolyte.

8 . The method of claim 7 , further comprising:
forming each of the plurality of electrochemical storage cells by winding first and second electrode sheets around a cylindrical core to form a jellyroll structure, the first and second electrode sheets each comprising uncoated conductive edges parallel to end faces of the jellyroll structure, and coated opposing surfaces between the uncoated conductive edges, winding first and second separator sheets around the cylindrical core between the first and second electrode sheets to mechanically and electrically separate the coated opposing surfaces of the first and second electrode sheets and to mechanically and electrically separate the cylindrical core and the coated opposing surfaces, and cutting out portions from the uncoated conductive edges of the first and second electrode sheets to form tabs, the tabs protruding axially outward, the tabs being angularly co-located relative to the cylindrical core upon forming the jellyroll structure.

9 . The method of claim 8 , wherein electrically connecting each of the plurality of electrochemical storage cells in series comprises compressing the angularly co-located tabs to electrically connect the uncoated conductive edges of a first electrode of one of the plurality of electrochemical storage cells to the uncoated conductive edges of a second electrode of an adjacent one of the plurality of electrochemical storage cells.

10 . The method of claim 9 , wherein electrically connecting each of the plurality of electrochemical storage cells in series further comprises welding the compressed tabs to a conductive insert of the housing to electrically connect the uncoated conductive edges of the first electrode of one of the plurality of electrochemical storage cells to the uncoated conductive edges of the second electrode of the adjacent one of the plurality of electrochemical storage cells.

11 . The method of claim 7 , further comprising hermetically sealing the electrochemical multi-cell by one or more of a dipping, spraying, physical vapor deposition, or metal sputtering process.

12 . The method of claim 7 , further comprising fluidly isolating each of the annular cell chambers.

13 . The method of claim 7 , wherein the plurality of electrochemical storage cells comprises four electrochemical storage cells, and the electrochemical storage multi-cell comprises an electrochemical storage quad-cell.

Assignees

• A123 Systems Llc

Inventors

• Dawson James E
• Ijaz Mujeeb

Classifications

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• H01M10/0422

  Cells or battery with cylindrical casing · CPC title

• H01M10/0587 Primary

  of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators · CPC title

• H01M50/55

  on the same side of the cell · CPC title

• H01M50/559

  Terminals adapted for cells having curved cross-section, e.g. round, elliptic or button cells (H01M50/553 takes precedence) · CPC title