Automatic reset flood valve

1. A valve comprising:

a holder having an expandable material;

a retainer coupled to the holder;

a stem having a first end coupled to the holder; and

an umbrella member coupled to a second end of the stem;

wherein the expandable material is adapted to expand in size when absorbing a fluid thereby causing the umbrella member to be translated along an axis of the stem.

2. The valve of claim 1 , wherein the expandable material comprises a stack of non-circular shaped elements.

3. The valve of claim 2 , wherein the non-circular shaped elements define a plurality of slots disposed around a periphery of each of the non-circular shaped elements.

4. The valve of claim 3 , wherein the valve further includes a spring adapted to hold the stack of non-circular shaped elements in a compressed state.

5. The valve of claim 1 , wherein the umbrella member comprises:

a first umbrella member portion extending radially away from the stem, the first umbrella member portion defining a circumferential boundary portion having a first diameter;

a second umbrella member portion extending radially away from the circumferential boundary portion of the first umbrella member portion, the second umbrella member portion having a second diameter;

wherein the first umbrella member portion and the second umbrella member portion together define a substantially conical shape of the umbrella member; and

wherein the second umbrella member portion is adapted to be tilted relative to the first umbrella member portion on application of a force on the circumferential boundary portion.

6. The valve of claim 5 , wherein an area of the second umbrella member portion is greater than an area of the first umbrella member portion.

7. The valve of claim 5 , wherein the second umbrella member portion defines a threshold tilting diameter of the valve such that the second diameter should be greater than or equal to the threshold tilting diameter for the second umbrella member portion to be tilted relative to the first umbrella member portion on application of the force on the circumferential boundary portion.

8. The valve of claim 7 , wherein ratio of the threshold tilting diameter and the first diameter is between 1.4 and 3.0.

9. The valve of claim 5 , wherein a structure of the valve defines a threshold tilting diameter of the valve such that the second diameter should be greater than or equal to the threshold tilting diameter for the second umbrella member portion to be tilted relative to the first umbrella member portion on application of the force on the circumferential boundary portion.

10. A battery enclosure comprising:

an enclosure;

a plurality of cells housed inside the enclosure;

a stem having a first end coupled to a housing;

an umbrella member coupled to a second end of the stem;

a retainer coupled to the enclosure, a holder and the stem; and

an expandable material disposed within the holder, wherein the expandable material is adapted to expand in size when absorbing a fluid thereby causing the umbrella member to be translated along an axis of the stem.

11. The battery enclosure of claim 10 , wherein the expandable material comprises a stack of non-circular shaped elements.

12. The battery enclosure of claim 11 , wherein the non-circular shaped elements define a plurality of slots disposed around a periphery of each of the non-circular shaped elements.

13. The battery enclosure of claim 12 , wherein the valve further includes a spring adapted to hold the stack of non-circular shaped elements in a compressed state.

14. The battery enclosure of claim 10 , wherein the umbrella member comprises:

a first umbrella member portion extending radially away from the stem, the first umbrella member portion defining a circumferential boundary portion having a first diameter;

a second umbrella member portion extending radially away from the circumferential boundary portion of the first umbrella member portion, the second umbrella member portion having a second diameter;

wherein the first umbrella member portion and the second umbrella member portion together define a substantially conical shape of the umbrella member; and

wherein the second umbrella member portion is adapted to be tilted relative to the first umbrella member portion on application of a force on the circumferential boundary portion.

15. The battery enclosure of claim 14 , wherein an area of the second umbrella member portion is greater than an area of the first umbrella member portion.

16. The battery enclosure of claim 14 , wherein the second umbrella member portion defines a threshold tilting diameter of the valve such that the second diameter should be greater than or equal to the threshold tilting diameter for the second umbrella member portion to be tilted relative to the first umbrella member portion on application of the force on the circumferential boundary portion.

17. The battery enclosure of claim 16 , wherein ratio of the threshold tilting diameter and the first diameter is between 1.4 and 3.0.

18. A method of assembling a valve with a battery enclosure, the valve having an umbrella member coupled to a second end of a stem, the method comprising:

providing an enclosure of a battery system;

providing an opening defined by a surface of the enclosure of the battery system;

positioning a retainer within the enclosure;

coupling a holder to the retainer;

positioning expandable material within holder;

inserting a first end of the stem into the holder; and

positioning the stem and umbrella member such that the umbrella member provides a liquid tight seal for the opening.

19. The method of claim 18 , wherein the steps of coupling a holder to the retainer and positioning expandable material within holder occur prior to positioning a retainer within the enclosure.

20. The method of claim 18 , further comprising:

twisting the valve to disengage a tab from the enclosure; and

disengaging the valve from the enclosure.