A negative electrode used in a nickel metal hydride secondary battery includes a negative electrode core body and a negative electrode mixture carried on the negative electrode core body. The negative electrode mixture includes hydrogen storage alloy powder which is an aggregate of hydrogen storage alloy particles, a binder, and a thickener. The hydrogen storage alloy particles have a volume mean particle size of 40 m or less and a concentration of chlorine of not less than 180 ppm to not more than 780 ppm.

Electrodes and methods of creating co-continuous composite electrodes based on a highly porous current collector are provided. In one embodiment, a method for creating an electrode includes depositing a thin layer of material on the polymer template, removing polymer material of the polymer template and depositing a second material. The method may also include controlling internal surface area per unit volume and the active material thickness of at least the second material to tune the electrochemical performance of the electrode. In one embodiment, a composite electrode is provided including interpenetrating phases of a metal current collector, electrolytically active phase, and electrolyte.

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.

A nickel-metal hydride secondary battery is provided with: an outer package can having an opening at an upper end; an electrode group accommodated in the outer package can together with an alkaline electrolyte; and a sealing body that seals the opening of the outer package can. The sealing body includes a cover plate having a central through hole, and a valve element made of an elastic material to close the central through hole. The valve element includes a cylindrical main body part having a base end surface that covers the central through hole, and an extended diameter part positioned on an opposite side of the main body part from the base end surface and having a diameter made larger than a diameter of the main body part. A ratio R of a thickness T of the extended diameter part to a total height H of the valve element is equal to or higher than 27%.

An electric storage device includes an electric storage element including an external terminal, and a bus bar connected to the external terminal. The bus bar includes a thin-walled portion and a thick-walled portion, the thin-walled portion being located around outer edges of the bus bar. The thin-walled portion and the external terminal are directly welded together. A thickness of the thin-walled portion is less than a thickness of a remaining portion of the bus bar including the thick-walled portion.

Provided is a highly reliable nickel-zinc battery including a separator exhibiting hydroxide ion conductivity and water impermeability. The nickel-zinc battery includes a positive electrode containing nickel hydroxide and/or nickel oxyhydroxide; a positive-electrode electrolytic solution in which the positive electrode is immersed, the electrolytic solution containing an alkali metal hydroxide; a negative electrode containing zinc and/or zinc oxide; a negative-electrode electrolytic solution in which the negative electrode is immersed, the electrolytic solution containing an alkali metal hydroxide; a hermetic container accommodating the positive electrode, the positive-electrode electrolytic solution, the negative electrode, and the negative-electrode electrolytic solution; and the separator exhibiting hydroxide ion conductivity and water impermeability and disposed in the hermetic container so as to separate a positive-electrode chamber from a negative-electrode chamber. The alkali metal hydroxide concentration of the positive-electrode electrolytic solution differs from that of the negative-electrode electrolytic solution.

Provided is a highly reliable nickel-zinc battery including a separator exhibiting hydroxide ion conductivity and water impermeability. The nickel-zinc battery includes a positive electrode containing nickel hydroxide and/or nickel oxyhydroxide; a positive-electrode electrolytic solution in which the positive electrode is immersed, the electrolytic solution containing an alkali metal hydroxide; a negative electrode containing zinc and/or zinc oxide; a negative-electrode electrolytic solution in which the negative electrode is immersed, the electrolytic solution containing an alkali metal hydroxide; a hermetic container accommodating the positive electrode, the positive-electrode electrolytic solution, the negative electrode, and the negative-electrode electrolytic solution; and the separator exhibiting hydroxide ion conductivity and water impermeability and disposed in the hermetic container so as to separate a positive-electrode chamber from a negative-electrode chamber. The alkali metal hydroxide concentration of the positive-electrode electrolytic solution differs from that of the negative-electrode electrolytic solution.

An open cabin electric wheeled vehicle includes a large-capacity driving battery having a volume energy density higher than the volume energy density of a lead storage battery, the large-capacity driving battery being configured to supply electric power to a driving electric motor. The vehicle also includes a fuel-type electric power generation apparatus that generates electric power using a fuel. As seen from a leftward direction or a rightward direction, between the large-capacity driving battery and the fuel-type electric power generation apparatus, a recess overlaps with a passage region which allows people or baggage to pass through of an entrance and exit opening portion having no door, so that a bottom end of a front wall portion, a bottom end of a rear wall portion, and a bottom portion are located further downward than a top end of the large-capacity driving battery which has a volume energy density higher than the volume energy density of a lead storage battery, and a top end of the fuel-type electric power generation apparatus.

An electric storage device includes an electrode assembly, a case that includes a defining wall and houses the electrode assembly, a sealing member that is arranged on the defining wall, and a conductive member that is electrically connected to the electrode assembly, the conductive member being supported by the sealing member. At least a portion of the defining wall where the sealing member is arranged includes an aluminum-based metallic material. The sealing member includes a material that is softer than the material for the at least a portion of the defining wall where the sealing member is arranged. The sealing member includes polyphenylene sulfide (PPS) resin and an elastomer. The elastomer is contained in an amount of 2% to 20% by weight. The conductive member is crimped in such a manner that the sealing member is pressed against the defining wall.

Electrodes and methods of creating co-continuous composite electrodes based on a highly porous current collector are provided. In one embodiment, a method for creating an electrode includes depositing a thin layer of material on the polymer template, removing polymer material of the polymer template and depositing a second material. The method may also include controlling internal surface area per unit volume and the active material thickness of at least the second material to tune the electrochemical performance of the electrode. In one embodiment, a composite electrode is provided including interpenetrating phases of a metal current collector, electrolytically active phase, and electrolyte.