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A leak resistant automotive battery comprising a housing containing cells having filling plugs; a battery cover sealed to an opened top end of the housing and having filling holes overlying the respective cells; at least one partition wall provided in the battery cover to divide the battery cover in

A leak resistant automotive battery comprising a housing containing cells having filling plugs; a battery cover sealed to an opened top end of the housing and having filling holes overlying the respective cells; at least one partition wall provided in the battery cover to divide the battery cover into at least two vent chambers, each vent chamber overlying a set of the cells, to prevent flow of electrolyte from one set of cells to an adjacent set of cells when the battery is tilted; a common vent line in the battery cover connecting the spaces above the cells in each set of cells, each of the common vent line being sealed at one end and connected at its other end through a vent chamber to one end of each of parallel vent lines having at its other end a vent cap assembly which permits escape of vented gases from the cells in each set.

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1. A leak resistant automotive battery comprising a housing containing cells each having a filling plug, a battery cover fitted to said housing at its opened top in a liquid tight manner and having filling holes overlying said cells, respectively and a pair of terminals mounted on the battery cover

1. A leak resistant automotive battery comprising a housing containing cells each having a filling plug, a battery cover fitted to said housing at its opened top in a liquid tight manner and having filling holes overlying said cells, respectively and a pair of terminals mounted on the battery cover and connected to said cells; characterized by further comprising vent line blockage means to divide said battery cover into at least two vent chambers corresponding to two sets of said cells so that electrolyte is prevented from flowing from one of said sets of said cells to the other set of said cells when said battery is tilted; a common vent line provided in said battery cover to connect the spaces above said cells for each sets of said cells to each other for every set of said cells, and a parallel vent line provided in said battery cover for each of said sets of cells separately from said common vent line, one end of said common vent line being closed while the other end of said common vent line is connected through said corresponding vent chamber to one end of said parallel vent line and said parallel vent line at the other end having a vent cap assembly to permit escape of vented gas from said cells of each set.2. A leak resistant automotive battery as set forth in claim 1 and wherein said common vent line in each vent chamber is sealed at said one end by means of a vent stop extending through said battery cover into said vent hole of the first cell of each set.3. A leak resistant automotive battery as set forth in claim 1 and wherein said vent cap assembly comprises a vent cap fitted to said other end of said parallel vent line and a gas filter provided in said vent cap for allowing the vent gas to escape.4. A leak resistant automotive battery as set forth in claim 1 and wherein said vent cap assembly comprises a vent cap fitted to said other end of said parallel vent line and a gas filter provided in said vent cap for allowing the vent gas to escape and wherein said vent cap on its outer periphery has a helical path in communication with said other end of said parallel vent line, said gas filter communicating with a downstream side of said helical path.5. A leak resistant automotive battery as set forth in claim 4 wherein said vent cap further comprises a vent hole provided on an inlet side thereof and connected to said other end of said parallel vent line, a first vertical hole extending from said vent hole upwardly to the inlet side of said helical path and a second vertical hole extending downwardly to a cap center at the exit side of said vent cap so as to connect an outlet end of said helical path and said gas filter.6. A leak resistant automotive battery as set forth in claim 4 wherein said gas filter is a water-repellant microporous gas filter.7. A leak resistant automotive battery as set forth in claim 4 wherein said gas filter is a water-repellant microporous gas filter having a grain size of about 270 microns.8. A leak resistant automotive battery as set forth in claim 4 wherein said gas filter provided in said vent cap is covered by means of a filter cover having a hole for escape of the vented gas.9. A leak resistant automotive battery as set forth in claim 1 wherein each of said vent chambers is provided with a chamber cover press-fitted thereto, said vent chamber and said chamber cover being sealed to said battery cover.10. A leak resistant automotive battery as set forth in claim 1 wherein said housing includes side walls and has a honeycomb structure provided on the side walls.11. A leak resistant automotive battery comprising a housing containing cells each having a filling plug, a battery cover heat-sealed to an opened top end of said housing and having filling holes overlying said cells, respectively and a pair of terminals mounted on said battery cover and connected to said cells; characterized in that at least one partition wall is provided in said battery cover to divide said battery cover into at least two vent chambers, each vent chamber overlying a set of said cells to prevent electrolyte from flowing from one of said sets of said cells to the adjacent set of said cells when said battery is tilted and in that a common vent line provided in said battery cover connects the spaces above said cells for each set of said cells, each common vent line being sealed at one end and connected at the other end through the corresponding vent chamber to one end of the corresponding parallel vent line, each parallel vent line at the other end having a vent cap assembly which permits escape of vented gas from said cells of each set.12. A leak resistant automotive battery as set forth in claim 11 and wherein said vent cap assembly comprises a vent cap fitted to said other end of said parallel vent line and a gas filter provided in said vent cap for allowing the vent gas to escape.13. A leak resistant automotive battery as set forth in claim 11 and wherein said vent cap assembly comprises a vent cap fitted to said other end of said parallel vent line and a gas filter provided in said vent cap for allowing the vent gas to escape and wherein said vent cap on its outer periphery has a helical path in communication with said other end of said parallel vent line, said gas filter communicating with a downstream side of said helical path.14. A leak resistant automotive battery as set forth in claim 11 and wherein said common vent line in each vent chamber is sealed at said one end by means of a vent stop extending through said battery cover into said vent hole of the first cell of each set.15. A leak resistant automotive battery as set forth in claim 13 wherein said vent cap further comprises a vent hole provided on an inlet side thereof and connected to said other end of said parallel vent line, a first vertical hole extending from said vent hole upwardly to the inlet side of said helical path and a second vertical hole extending downwardly to a cap center at an exit side of said vent cap so as to connected the outlet end of said helical path and said gas filter.16. A leak resistant automotive battery as set forth in claim 13 wherein said gas filter is a water-repellant microporous gas filter.17. A leak resistant automotive battery as set forth in claim 13 wherein said gas filter is a water-repellant microporous gas filter having a grain size of about 270 microns.18. A leak resistant automotive battery as set forth in claim 13 wherein said gas filter provided in said vent cap is covered by means of a filter cover having a hole for escape of the vented gas.19. A leak resistant automotive battery as set forth in claim 11 wherein each of said vent chambers is provided with a chamber cover press-fitted thereto, said vent chamber and said chamber cover being sealed to said battery cover.20. A leak resistant automotive battery as set forth in claim 11 wherein housing includes side walls and has a honeycomb structure provided on the side walls.