Patent ID: 8652669
Filing Date: 2014-02-18
Classification: H01M,Y02E

Abstract:
1. A lead-acid battery, comprising: a container having plural cell chambers; a lid body for covering a top opening of the container, the lid body having on its top surface a recessed portion that is recessed downward, the recessed portion having: a bottom wall constituting a bottom portion; a vertical wall rising upward from an outer periphery of the bottom wall; a first annular protruding portion, which protrudes upward on the bottom wall and is positioned inside the vertical wall, and a second annular protruding portion, which protrudes upward on the bottom wall and is positioned inside the vertical wall and outside the first annular protruding portion, the bottom wall having plural first exhaust holes in an area inside the first annular protruding portion, which communicate with the respective plural cell chambers, and a second exhaust hole in an area inside the second annular protruding portion; and a lid body cover for closing the recessed portion; the lid body cover having a first joining portion provided corresponding to the first annular protruding portion and joined to the first annular protruding portion to form a space, and a second joining portion provided corresponding to the second annular protruding portion and joined to the second annular protruding portion to form a guide passage, wherein the second exhaust hole communicates with the guide passage and with a particular cell chamber with which one of the first exhaust holes communicates; and a groove is provided in the recessed portion, between the first annular protruding portion and the vertical wall and outside the second annular protruding portion, the groove being configured to surround the first annular protruding portion and the second annular protruding portion, the groove being covered with a portion including an outer periphery of the lid body cover and is isolated from the space and the guide passage.