A battery enclosure for a personal watercraft is provided. Different configurations of the battery enclosure are disclosed, as well as different arrangements of the battery enclosure within the personal watercraft and with respect to other features of the personal watercraft. According to one embodiment, a personal watercraft includes a deck and a hull defining an interior volume. An electric motor is housed within the interior volume, the electric motor being operable to rotate a drive shaft. A battery pack having a battery enclosure housing one or more batteries is also positioned within the interior volume. A portion of at least one battery of the one or more batteries is positioned vertically above the drive shaft.

A marine battery charger system configured to be installed on a marine vessel to charge a marine battery includes a housing, a charging circuit in the housing configured to receive AC power and to output a charge current to the marine battery, and a cord. The cord has a plug end configured to engage an AC power outlet and is configured to transmit the AC power from the AC power outlet to the charging circuit. A controller is configured to control a charging operation mode of the charging circuit and a status indicator is located at the plug end of the cord and configured to be controlled by the controller to indicate the charging operation mode of the charging circuit.

Systems and methods are disclosed herein for a charging system. The charging system may be implemented within an independent charging station or within an autonomous vehicle. Boolean charging can be used to obtain the desired charge or discharge voltage for charging an autonomous vehicle at a charging station. By combining a subset of a sequence of batteries arrays that differ in voltage by powers of two in series, where each battery array may include multiple batteries or battery cells, a voltage may be obtained which is equal to the sum of the voltages across each battery array. This voltage may be used in turn to charge additional batteries or battery arrays. The process may be repeated until the desired amount of battery arrays has been charged and the desired voltage has been achieved.

A battery enclosure for a personal watercraft is provided. Different configurations of the battery enclosure are disclosed, as well as different arrangements of the battery enclosure within the personal watercraft and with respect to other features of the personal watercraft. According to one embodiment, a personal watercraft includes a deck and a hull defining an interior volume. An electric motor is housed within the interior volume, the electric motor being operable to rotate a drive shaft. A battery pack having a battery enclosure housing one or more batteries is also positioned within the interior volume. A portion of at least one battery of the one or more batteries is positioned vertically above the drive shaft.

The present disclosure relates to an energy storage device for a water vessel, the energy storage device comprising: a first connection and a second connection, an energy storage unit with a first pole and a second pole, a first connection line between the first pole and the first connection and a second connection line between the second pole and the second connection, wherein the first connection line has a first node, which is connected with the first pole, and a second node, which is connected with the first connection, and wherein the second connection line has a fourth node, which is connected with the second pole and the second connection, a third connection line between the first node and the second node, with a third node and an inductance between the third node and the second node, and a fourth connection line between the third node and the fourth node with a free-wheeling diode, which is arranged for a current from the fourth node to the third node in forward direction, a first switching unit in the first connection line between the first node and the second node for switching a current from the first node to the second node and a third switching unit in the third connection line between the first node and the third node for switching a current from a first node to the third node, and a control unit, which is configured for controlling the first switching unit and/or the third switching unit for limiting the strength of a discharge current for the energy storage unit to a predefined discharge threshold value. The disclosure further relates to an energy storage system with at least two such energy storage devices and control method for the energy storage device and for the energy storage system and a pre-charging circuit.

A safety auxiliary system, coupled to a modular battery of an underwater vehicle having a number of modules, each provided with a plurality of cells, has: a first subsystem, which detects conditions indicative of a thermal runaway in any of the modules d manages such a thermal runaway, intervening locally on the module to cool the corresponding cells so that the thermal runaway is not propagated; and a second subsystem, cooperating with, and operatively coupled to, the first subsystem, which manages gases present in the module associated with the thermal runaway, preventing them from pouring inside the underwater vehicle. The first subsystem is provided with a first electronic control unit for each of said modules, and the second subsystem is provided with a second electronic control unit, distinct from, and operatively coupled to, the first electronic control unit through a communication connection, so as to receive an alarm signal upon detection of the conditions indicative of the thermal runaway in the corresponding module.

The present invention relates to a power supply system for underwater vehicles, in particular to a power supply system for autonomous underwater vehicles, to underwater vehicles equipped with such power supply systems and to a method of operating an underwater vehicle. The power supply system for underwater vehicles comprises a hydrogen fuel cell, which on the one hand is in fluid contact with a metal hydride storage tank, and on the other hand, with a membrane module that is capable of extracting dissolved oxygen from water. By combining the above mentioned components, the energy necessary to support the AUV operation and the operation of its sensors can be provided, replacing in an efficient and sustainable way the currently employed battery energy systems. For the operation of gliders, a weight compensating mechanism could also be implemented.

Methods, systems, and computer-readable media that implement autonomous seagoing power replenishment watercraft. An example system includes a plurality of marine vessels; a plurality of watercraft, each watercraft of the plurality of watercraft including a rechargeable electrical power supply and being configured to operate in: a first mode in which the watercraft awaits an assignment to provide electrical energy to a marine vessel of the plurality of marine vessels; a second mode in which the watercraft performs operations including keeping station with an assigned marine vessel and providing electrical energy to the assigned marine vessel from the power supply; and a third mode in which the watercraft recharges the power supply from a charging station. The system includes a controller configured to perform operations comprising: transmitting, to a first watercraft, an instruction indicating an assignment of the first watercraft to provide electrical energy to a first marine vessel.

The present disclosure relates to a method for determining the working life of a traction battery of a boat, including the steps of determining a system configuration and/or operating conditions of the boat, providing a traction battery model, which states an ageing condition of the traction battery as time progresses depending on the system configuration and/or operating conditions determining at least one condition that confirms the end-of-life condition of the traction battery has been reached and calculating the time-period until the end-of-life condition is reached on the basis of the traction battery model.

A marine battery pack including a battery enclosure having an exterior and an interior defining a cavity, wherein the battery enclosure is configured to protect against water ingress into the cavity. The marine battery pack further comprises a plurality of cell modules within the cavity, each including a plurality of battery cells, and at least one exterior sensor on the battery enclosure configured to sense at least one of an exterior temperature, an exterior pressure, and a presence of water on the exterior of the battery enclosure. A controller is configured to identify a water exposure event based on the at least one of the exterior temperature, the exterior pressure, and the presence of water on the exterior of the battery enclosure. A water exposure response is then generated.