Fuel cell support and electrical interconnector

• US 6,653,003 B1
• Filed: 10/12/1999
• Issued: 11/25/2003
• Est. Priority Date: 10/12/1999
• Status: Expired due to Fees

• Current Assignee: Reveo, Inc.
• Original Assignee: Reveo, Inc.
• Inventors: Morris, William, Li, Lin-Feng, Tzeng, George, Rabin, Michael, Faris, Sadeg M., Yao, Wayne, Tsai, Tsepin
• Primary Examiner(s): Chaney, Carol
• Assistant Examiner(s): YUAN, DAH WEI D
• Application Number:
  US09/416,554
• Time in Patent Office: 1,505 Days
• Field of Search: 429/9, 429/18, 429/27, 429/123, 429/152
• US Class Current: 429/406
• CPC Class Codes: H01M 10/613 Cooling or keeping cold
• CPC Class Codes: H01M 10/647 Prismatic or flat cells, e.g. pouch cells
• CPC Class Codes: H01M 10/6563 with forced flow, e.g. by blowers
• CPC Class Codes: H01M 12/065 with plate-like electrodes or stacks of plate-like electrodes
• CPC Class Codes: H01M 8/0273 with sealing or supporting means in the form of a frame
• CPC Class Codes: H01M 8/0297 Arrangements for joining electrodes, reservoir layers, heat exchange units or bipolar separators to each other H01M8/0271 takes precedence
• CPC Class Codes: H01M 8/2459 Comprising electrode layers with interposed electrolyte compartment with possible electrolyte supply or circulation
• CPC Class Codes: H01M 8/247 Arrangements for tightening a stack, for accommodation of a stack in a tank or for assembling different tanks
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02E 60/50 Fuel cells

Abstract

Flat plate fuel cells, particularly air-depolarized cells, are stacked and electrically interconnected into a battery structure with a connector block and tray. The anode and cathode elements of each cell are provided with extending terminal conductor elements (e.g., banana plugs), preferably extending in downward “U” shaped configuration from the upper ends of the anode and cathode elements respectively. The connector block comprises a series of conductive apertures, positioned and sized to accommodate the terminal conductor elements of the electrodes therein and the connector block comprises electrical interconductive elements to electrically connect- the electrodes of the stacked cells in a desired electrical interconnection (serial, parallel and mixed serial and parallel segments). The interconnection between terminal conductor elements and the respective apertures further serves to support and orient the cells in a minimal volume and permits selective rapid cell removal for replacement or servicing. The cells are also provided with keyed members for keyed interlocking with a support tray having co-fitting keying elements to provide full structural integrity for the stacked cells. Lateral end elements extend between the connector block and support tray to complete an open enclosure and provide a support base for air circulating devices such as fans. Air is circulated through a duct defined by the block and between the fuel cells.

Claims

1. A fuel cell battery structure comprising

at least two fuel cells and an electrical connector block,

with said fuel cells being electrically interconnected into a battery structure via said connector block,

wherein each cell comprises an anode and cathode element and,

wherein said block is elongated along a longitudinal axis and said cells are axially engaged with said block;

wherein said block comprises at least two rows of apertures extending along said axis;

wherein each of the anode and cathode elements of each cells are provided with a terminal conductor element positioned on one side of the respective fuel cells;

means for electrically connecting the anodes and cathodes of the stacked cells into an electrical interconnection selected from the group consisting of series electrical interconnection parallel electrical interconnection and mixed series and parallel electrical interconnection and with each of the fuel cells on said one side of the respective fuel cells;

wherein said terminal conductor elements of said anodes and cathodes extend away from the respective cells and are adapted to be respectively inserted and engaged with said apertures, wherein the terminal conductor elements of said anodes, when said cells are aligned, are offset from the terminal conductor elements of the cathodes, wherein the terminal conductor elements of the anodes are engaged with apertures in one of said rows and the terminal conductor elements of the cathodes are engaged with apertures of the other of said rows;

wherein the connector block further comprises circuit connection means for electrically connecting the terminal conductor elements of anodes and cathodes of the stacked cells into an electrical interconnection selected from the group consisting of series electrical interconnection, parallel electrical interconnection and mixed series and parallel electrical interconnection and

wherein said block mechanically holds the respective fuel cells on the block, in a fixed position as a result of said mechanical engagement, and

wherein another side of each of the fuel cells remains exposed to permit disengagement and removal of the fuel cells from the block.

2. The fuel cell battery of claim 1, wherein the terminal conductor elements of the anodes and cathodes are configured in downwardly extending U-shaped configurations and said apertures in said block are positioned in an upper surface thereof, whereby the individual fuel cells are mechanically fixed against the block with engagement of the terminal conductor elements and the apertures of said block.

3. The fuel cell battery of claim 1, wherein said block comprises two pairs of rows of apertures adapted for engagement with the anode and cathode terminal conductor elements of at least two fuel cells laterally positioned against two lateral sides of said block.

4. The fuel cell battery of claim 3 wherein the fuel cells are air depolarized and wherein a spacing for air ingress is provided between adjacent cells on each side of said block.

5. The fuel cell battery of claim 4 wherein the block and the ends of the cells, adjacent the block, define an air duct for channeling of air to said cells for the depolarization thereof.

6. The fuel cell battery of claim 5, wherein said block is supported by support means to thereby provide an open area beneath said block as part of said air duct.

7. The fuel cell battery of claim 6, wherein said support means further support air movement control means for providing and moving air within said air duct to said cells.

8. The fuel cell battery of claim 7, wherein said air movement control means comprises at least one fan attached to at least one of said block support means.

9. The fuel cell battery of claim 7, wherein said block comprises a solid rectangular configuration with lateral flange ledges wherein each of said ledges comprises one of said rows of apertures on an upper surface thereof and wherein an upper surface of the solid rectangle comprises a pair of rows, wherein the apertures in said ledges are adapted to be engaged with terminal conductor elements of one of the anode and cathode of the cells respectively adjacent thereto, and wherein the apertures in the pair of rows of the solid rectangle are adapted to be engaged with the terminal conductor elements of the other of said anode and cathode of the cells respectively adjacent thereto.

10. The fuel cell battery of claim 9, wherein the battery further comprises a support tray, with said fuel cells, engaged with said block being further supported by said tray and wherein said tray and said fuel cells comprising co-fitting key elements to help maintain said fuel cells in position relative to said block.

11. The fuel cell battery of claim 9, wherein the terminal conductor elements of the anodes and cathodes are configured in downwardly extending U-shaped configurations, whereby the individual fuel cells are mechanically fixed against the block with engagement of the terminal conductor elements and the apertures of said blocks.

12. The fuel cell battery of claim 9, wherein said apertures are through apertures, and said block is comprised of an electrically insulative material;

wherein the means for electrically connecting the anodes and cathodes of the stacked cells into an electrical interconnection selected from the group consisting of series electrical interconnection, parallel electrical interconnection and mixed series and parallel electrical interconnection comprises electrically conductive receptacle elements disposed within each of said apertures for engagement with said terminal conductor elements and for selective electrical interconnection into an electrical arrangement selected from the group consisting of series electrical interconnection, parallel electrical interconnection and mixed series and parallel electrical interconnection of said fuel cells.

13. The fuel cell battery of claim 12, wherein said receptacle elements each comprise a conductive member which extends from the respective through apertures and which conductive members are engaged by electrically conductive bus bar members to effect said electrical interconnection.

14. A method for maintaining fuel cells in operative condition during the use thereof in a battery structure, comprising the steps of:

a) arranging said cells into the battery structure of claim 1,

b) disengagingly removing any cell requiring mechanical recharging of any of said anode and electrolyte from said block,

c) effecting replacement or addition or anode and electrolyte as required, and

d) re-engaging said cell with said block.

15. A fuel cell adapted for use in the battery structure of claim 1, comprising a flat plate structure configuration comprised of a replaceable zinc anode plate disposed between two air depolarizing cathode plates and separated therefrom by separator means, wherein the cathode plates are peripherally held in a sealed frame structure whereby a surface of each said cathodes is externally exposed for contact with depolarizing air;

said cell further comprising an anode current collector extending along an edge of said anode and terminating in a terminal conductor element which extends externally on one side of said cell and wherein said cell comprises a cathode current collector electrically engaged with said cathode plates which terminates in a terminal conductor element which extends externally on said one side of said cell.