A system and method for mitigating the effects of a thermal event within a non-metal-air battery pack is provided in which the hot gas and material generated during the event is directed into the metal-air cells of a metal-air battery pack. The metal-air cells provide a large thermal mass for absorbing at least a portion of the thermal energy generated during the event before it is released to the ambient environment. As a result, the risks to vehicle passengers, bystanders, first responders and property are limited.

An ammonia fuel cell system and an electric device are described. The ammonia fuel cell system includes an ammonia decomposition reaction device, a heating device, a hydrogen fuel cell, a DC/DC converter and an inverter connected successively, a battery pack and a heat exchanger. The heat exchanger of the system, can preheat ammonia gas by energy generated by ammonia decomposition, thereby recycling heat waste. The battery pack supports a quick response and stable output to quickly cope with the acceleration and deceleration of the electric device. This improves the stability of the system operation, and electric energy generated by the hydrogen fuel cell or electric energy in the battery pack can be transferred to the outside. The battery pack or the heating device can provide energy to the ammonia decomposition reaction device, so there is no need to supply outside energy to the ammonia decomposition reaction device.

A system and method for stabilizing electrodes against dissolution and/or hydrolysis including use of cosolvents in liquid electrolyte batteries for three purposes: the extension of the calendar and cycle life time of electrodes that are partially soluble in liquid electrolytes, the purpose of limiting the rate of electrolysis of water into hydrogen and oxygen as a side reaction during battery operation, and for the purpose of cost reduction.

A management device manages a second power storage device that reinforces a first power storage device for supplying electricity to loads in the vehicle. A power supply unit of the management device steps down a voltage supplied from the first power storage device. A control unit uses, as a power supply voltage, the voltage generated by the power supply unit and monitors the state of the second power storage device to control the charging and discharging of the second power storage device. A switch electrically connects or disconnects the second power storage device to or from the power supply unit. The switch is turned on when an ignition is in an on-state, and is turned off when the ignition is in an off-state.

A watch can include a watch body and a watch band that is capable of housing batteries and transferring power from the batteries to the watch body to power the watch. The watch band can include an inner frame that has multiple slots, each slot configured to house a corresponding battery. The watch band can further include an outer covering that encompasses the inner structure and hermetically seals the batteries. A battery connector operatively connects each of the batteries to each other and to the watch body.

Provided is an electricity-storage module including: a stacked body that includes electrodes which are stacked along a first direction; a sealing body that is provided to the stacked body so as to surround a peripheral edge portion of the electrodes, forms an inner space that stores an electrolytic solution between the electrodes adjacent to each other along the first direction, and seals the inner space; and a reinforcing body that is provided in the electrodes so as to suppress deformation of the electrodes. The electrodes include bipolar electrodes and a negative terminal electrode, the negative terminal electrode includes the electrode plate and a negative electrode provided on the second surface, and is disposed at one end of the stacked body in the first direction such that the second surface faces an inner side of the stacked body in the first direction.

A metal porous body is a metal porous body mainly composed of nickel and having a framework of a three-dimensional network structure, Ni(OH).sub.2 being present in a surface of the framework, when the metal porous body is subjected to at least 30 potential scans between a lower limit potential of 0.10 V and an upper limit potential of +0.65 V with respect to a hydrogen standard potential in not less than 10% by mass and not more than 35% by mass of a potassium hydroxide aqueous solution, at least oxygen being detected within a depth of 5 nm from the surface, and hydrogen being detected at least in the surface.

Disclosed is a hybrid electrochemical cell with a first conductor having at least one portion that is both a first capacitor electrode and a first battery electrode. The hybrid electrochemical cell further includes a second conductor having at least one portion that is a second capacitor electrode and at least one other portion that is a second battery electrode. An electrolyte is in contact with both the first conductor and the second conductor. In some embodiments, the hybrid electrochemical cell further includes a separator between the first conductor and the second conductor to prevent physical contact between the first conductor and the second conductor, while facilitating ion transport between the first conductor and the second conductor.

Disclosed herein is a regeneration method of a nickel-hydrogen battery provided with a positive electrode at least including nickel hydroxide. In the regeneration method, a regeneration process of charging a nickel-hydrogen battery is performed by supplying a square-wave pulse current set to a repetition frequency ranging from 5 kHz to 10 kHz and to an average value of current I.sub.AVE ranging from 1 A to 10 A.

The electricity storage device includes an electrode assembly, a case, and a holding tape. The electrode assembly further includes a bottom surface, which is supported by an inner bottom surface of the case, two end faces in a lamination direction, which are joined to the bottom face, two side surfaces, which are joined to the bottom surface and intersect with the end surfaces, and two corner sections, which are formed from the bottom surface and the side surfaces. Each corner section includes a chamfered section, and a border section between the chamfered section and the bottom surface. The holding tape covers the border section from the bottom surface in a direction parallel to the bottom surface and orthogonal to the stacking direction, further inward of the electrode assembly than the side surface.