Vent adapter for lead-acid battery systems

1. A lead-acid battery system comprising a lead acid battery, and a vent adapter coupled to a vent port of the lead-acid battery, wherein the vent adapter comprises:

a first side comprising a first connector having a first cross-sectional geometry along the first side and mated via a first interference fit with the vent port of the lead-acid battery, wherein the vent port is configured to vent gases evolved from the lead-acid battery; and

a second side in fluid communication with the first side and comprising a second connector having a second cross-sectional geometry along the second side configured to mate with a vent passage of an automobile, wherein the first and second cross-sectional geometries have respective shapes that are different from one another.

2. The lead-acid battery system of claim 1 , wherein the first cross-sectional geometry of the first connector is shaped and sized to mate with the vent port of the lead-acid battery in the first interference fit.

3. The lead-acid battery system of claim 1 , wherein the second cross-sectional geometry of the second connector is an outer surface geometry shaped and sized to be inserted into and mate with the vent passage of the automobile in a second interference fit.

4. The lead-acid battery system of claim 1 , wherein the second cross-sectional geometry of the second connector is an inner surface geometry shaped and sized to extend about and mate with the vent passage of the automobile in a second interference fit.

5. The lead-acid battery system of claim 4 , wherein the inner surface geometry comprises a receptacle having a complex geometric shape configured to receive a keyed vent tube of the automobile.

6. The lead-acid battery system of claim 5 , wherein the complex geometric shape comprises an annular portion and a polygonal portion that partially overlap with one another.

7. The lead-acid battery system of claim 5 , wherein the receptacle of the inner surface geometry comprises a first portion and a second portion coextensive with the first portion, the first and second portions both having generally the same complex geometric shape but having different size proportions, and wherein the first portion is configured to require a first insertion force of the keyed vent tube to insert the vent tube into the vent adapter, and the second portion is configured to require a second insertion force greater than the first to continue inserting the vent tube into the vent adapter.

8. The lead-acid battery system of claim 1 , comprising an internal venting passage having a first portion, a second portion, and a third portion each defined by different internal surface geometries of the vent adapter.

9. The lead-acid battery system of claim 8 , wherein the second portion is located between the first and third portions along the internal venting passage, and the second portion is smaller than the first and second portions.

10. The lead-acid battery system of claim 1 , wherein the lead-acid battery is a Battery Council International (BCI) group 65 or group 24F lead-acid battery, and wherein the first connector of the vent adapter comprises an outer surface having a frusto-conical portion and an annular neck portion coextensive with one another, and at least a part of the frusto-conical portion, the annular neck portion, or both, are substantially matched in diameter with the vent port of a Battery Council International (BCI) group 65 or group 24F lead-acid battery to enable the first connector to be inserted into the vent port to produce the first interference fit.

11. The lead-acid battery system of claim 10 , wherein the second connector comprises an obround outer surface having major and minor diameters that substantially match with a vent tube of a BCI group 66 application to enable the second connector to be inserted into the vent tube to produce a second interference fit.