| 摘要 |
A lead acid battery comprising a group of electrode plates including positive and negative plates in each of which an active material layer is held by a grid having an ear and separators separating the positive and negative electrodes and positive and negative electrode connection members including an electrode rack to which the ears of the electrode plates are connected and electrode poles or electrode connectors provided to the rack. Lead acid batteries have been conventionally used for engine start of a vehicle. Recently, from the viewpoint of environment conservation, idling stop systems for stopping the engine while the vehicle is stranding are considered to be installed. However, since lead acid batteries are not charged during idling stop, charging and discharging are frequently repeated in the range of insufficiently charged state. Consequently, there has been a problem that the ear of the negative plate grid becomes corroded. According to the invention, the above problem is solved by providing a lead acid battery where the positive and negative plate grids and the positive and negative electrode connection members are formed of Pb alloys containing at least Ca or Sn, the Sb content in the negative electrode active material is 0.0001 to 0.003 weight%, and at least a part of the surface of the positive electrode grid in contact with the positive electrode active material layer is provided with a lead alloy layer containing 0.01 to 0.2 weight% of Sb. ® KIPO & WIPO 2007
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