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Non-aqueous secondary battery and its control method

  • US 8,110,303 B2
  • Filed: 08/14/2006
  • Issued: 02/07/2012
  • Est. Priority Date: 05/20/1998
  • Status: Expired due to Fees
First Claim
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1. A lithium ion battery comprising:

  • at least one positive electrode;

    at least one negative electrode made of a material capable of being doped or undoped with lithium;

    a polyolefin separator, wherein the unit weight of the separator is not less than 5 g/m2 and not more than 30 g/m2;

    a liquid or gel electrolyte containing lithium salt and an organic solvent; and

    only one battery case in which said at least one positive electrode, said at least one negative electrode and the electrolyte are stored, wherein a material for the battery case is iron, stainless steel, or aluminum, and wherein a wall thickness of the battery case is not less than 0.2 mm and not more than 1 mm,the battery being at least 30 Wh in energy capacity and at least 180 Wh/l in volume energy density, formed by a single cell covered by the battery case, and having a flat shape with a thickness of less than 10 mm and not less than 2 mm, such that heat produced in the battery is releasable via the front and back flat faces of the battery, wherein the battery case houses only one cell,wherein a positive terminal to which said at least one positive electrode is connected and a negative terminal to which said at least one negative electrode is connected are mounted on a flat face of the battery case while being insulated from the battery case.

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