{
  "$type": "site.standard.document",
  "coverImage": {
    "$type": "blob",
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  "description": "An electrochemical fuel cell stack comprising an upper end plate assembly (14); a lower end plate assembly (16); at least one electrochemical fuel cell assembly (12) interposed between the upper and lower end plate assemblies; and a clamp mechanism operative (18) to compressively clamp the stack…",
  "path": "/patents/1113417",
  "publishedAt": "2001-04-25T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "H01M8/247",
    "GEN MOTORS CORP [US]"
  ],
  "textContent": "An electrochemical fuel cell stack comprising an upper end plate assembly (14); a lower end plate assembly (16); at least one electrochemical fuel cell assembly (12) interposed between the upper and lower end plate assemblies; and a clamp mechanism operative (18) to compressively clamp the stack. The upper end plate (14) assembly comprises a distributor plate (28) overlying the fuel cell assembly and pressed against the fuel cell assembly via a the clamp mechanism; an upper end plate (26) overlying the distributor plate and pressed against the distributor plate by the clamp mechanism; and a plurality of screws (30) threaded through threaded bores in the upper end plate at spaced locations in the upper end plate and bearing at their lower ends on an upper face of the distributor plate (28). The screws are selectively tightened to provide a substantially uniform torque in each screw whereby to assure uniform compressive loading across the area of the distributor plate and thereby across the area of the fuel cell assembly. The use of the screws to apply the compressive loading allows the use of a relatively thin upper end plate thereby reducing the overall weight of the fuel cell assembly for a given capacity fuel cell.",
  "title": "Fuel cell stack compression method and apparatus"
}