Watertight marine battery

1. A marine battery system configured to provide energy to a marine vessel load, comprising:

a main enclosure body;

an auxiliary enclosure body coupled to the main enclosure body to define a sealed battery volume, the auxiliary enclosure body configured to perform a pressure accommodation action responsive to an increase in a temperature within the sealed battery volume;

a battery disposed within the sealed battery volume;

a temperature sensor configured to detect temperature within the sealed battery volume and a pressure sensor configured to detect pressure within the sealed battery volume;

a controller configured to:

receive temperature information from the temperature sensor and pressure information from the pressure sensor; and

detect an enclosure breach, wherein the enclosure breach comprises an opening in the sealed battery volume, based only on a comparison of a current pressure and a current temperature within the sealed battery volume either to an expected pressure for the sealed battery volume at the current temperature or an expected temperature for the sealed battery volume at the current pressure, accounting for the pressure accommodation action.

2. The marine battery system of claim 1 , wherein the pressure accommodation action comprises expansion of a bladder to expand the sealed battery volume.

3. The marine battery system of claim 2 , wherein the bladder is disposed within the main enclosure body and the auxiliary enclosure body and wherein the bladder and the main enclosure body are configured to fully encapsulate the battery.

4. The marine battery system of claim 1 , wherein the pressure accommodation action comprises sliding of a piston.

5. The marine battery system of claim 4 , wherein the piston is coupled to a spring configured to be compressed by the sliding of the piston to expand the sealed battery volume.

6. The marine battery system of claim 1 , wherein:

the main enclosure body defines a first battery volume;

the auxiliary enclosure body defines a second battery volume; and

the sum of the first battery volume and the second battery volume comprises a maximum sealed battery volume.

7. The marine battery system of claim 1 , wherein the controller is further configured to perform an enclosure breach mitigation action in response to detection of the enclosure breach.

8. The marine battery system of claim 1 , wherein the auxiliary enclosure body is detachably coupled to the main enclosure body.

9. The marine battery system of claim 1 , further comprising a desiccant disposed within the sealed battery volume.

10. The marine battery system of claim 1 , further comprising a vent opening formed in a sidewall of the auxiliary enclosure body, wherein the vent opening is configured to facilitate expansion and contraction of the sealed battery volume.

11. The marine battery system of claim 10 , wherein the vent opening comprises a membrane configured to permit a flow of air through the vent opening and prevent a flow of fluid through the vent opening.

12. The marine battery system of claim 1 , further comprising a pressure relief valve configured to open when a pressure within the sealed battery volume exceeds a pressure safety threshold.

13. A marine battery system configured to provide energy to a marine vessel load, comprising:

a battery;

a main enclosure body;

an auxiliary enclosure body that is detachably coupled to the main enclosure body; and

wherein the battery is fully encapsulated within a sealed battery volume within the main enclosure body and the auxiliary enclosure body;

wherein an increase in a temperature within the sealed battery volume causes the sealed battery volume to expand within the auxiliary enclosure body to compensate for an increase in a pressure within the sealed battery volume;

a temperature sensor configured to detect temperature within the sealed battery volume and a pressure sensor configured to detect pressure within the sealed battery volume;

a controller configured to:

receive temperature information from the temperature sensor and pressure information from the pressure sensor; and

detect an enclosure breach, wherein the enclosure breach comprises an opening in the sealed battery volume, based only on a comparison of a current pressure and a current temperature within the sealed battery volume either to an expected pressure for sealed battery volume at the current temperature or an expected temperature for the sealed battery volume at the current pressure, accounting for the pressure accommodation action.

14. The marine battery system of claim 13 , further comprising:

a piston movable within the auxiliary enclosure body;

wherein the increase in a temperature within the sealed battery volume causes the piston to slide within the auxiliary enclosure body to expand the sealed battery volume.

15. The marine battery system of claim 13 , further comprising:

a bladder disposed within the main enclosure body and the auxiliary enclosure body;

wherein the increase in a temperature within the sealed battery volume causes the bladder to expand within the auxiliary enclosure body to expand the sealed battery volume.

16. The marine battery system of claim 12 , wherein the controller is further configured to detect the enclosure breach upon determining that an increase in the temperature information has not resulted in a corresponding increase in the pressure information.