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Semi-flooded lead acid battery cell

  • US 6,274,263 B1
  • Filed: 11/06/1998
  • Issued: 08/14/2001
  • Est. Priority Date: 10/27/1995
  • Status: Expired due to Term
First Claim
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1. A lead acid battery, comprising:

  • a sealed housing;

    a positive electrode comprising PbO2 active material;

    a negative electrode comprising lead active material;

    a liquid electrolyte within said sealed housing in contact with said positive and negative electrodes, said electrolyte comprising sulfuric acid and having a liquid levels;

    a gas space within said housing in which oxygen gas collects, said gas space having a bottom defined by said liquid level, a portion of said negative electrode being exposed in said gas space above said liquid level to thereby expose a portion of the lead active material to said gas space; and

    a pressure relief valve disposed in said battery in communication with said gas space to allow gas to escape said sealed housing while preventing oxygen from outside the housing to contact said negative electrode.

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