Abstract: A battery unit includes a secondary battery, a first trap, and a second trap. The secondary battery includes a battery case provided with a gas vent valve, and an electrolyte solution enclosed in the battery case. The first trap includes a mesh material disposed outside the battery case so as to oppose and cover the gas vent valve. The second trap includes a liquid retaining material made of a non-flammable material and disposed further outward of the first trap so as to oppose and cover the gas vent valve.

Abstract: An all-solid-state battery includes a solid electrode body including a positive electrode layer, a solid electrolyte layer, and a negative electrode layer, and a laminate film that stores the solid electrode body. The laminate film has a fragile part with respect to a needle-like foreign substance. The strength of the fragile part is lower than the strength of a part of the laminate film other than the fragile part.

Abstract: A cell, which is a non-aqueous electrolyte secondary battery, includes: an electrode assembly including a plurality of sheet-shaped positive electrodes and a plurality of sheet-shaped negative electrodes, the plurality of positive electrodes and the plurality of negative electrodes being alternately stacked with separators interposed therebetween; and a battery case that houses the electrode assembly. The electrode assembly includes: an outer layer including a positive electrode arranged on an outermost side of the electrode assembly, and a separator adjacent to the positive electrode; and an inner layer arranged on an inner side of the outer layer. The outer layer includes a fusing member configured to fuse due to heat generation in the electrode assembly caused by a short circuit in the electrode assembly. The inner layer does not include the fusing member.

Abstract: A cell that is a non-aqueous electrolyte secondary battery includes an electrode body in which a sheet-shaped positive electrode and a sheet-shaped negative electrode are stacked via a separator, and a battery case that accommodates the electrode body and an electrolytic solution. The electrode body includes a predetermined number of outer layers including an outermost layer made up of the separator and the negative electrode disposed on an outermost side of the electrode body, and an inner layer disposed on an inner side than the outer layer. The outer layer includes a negative electrode mixture layer configured to suppress heat generation of the electrode body caused by a short circuit of the electrode body as a heat generation suppressing member. The inner layer does not include the heat generation suppressing member.

Abstract: A battery unit includes a secondary battery, a first trap, and a second trap. The secondary battery includes a battery case provided with a gas vent valve, and an electrolyte solution enclosed in the battery case. The first trap includes a mesh material disposed outside the battery case so as to oppose and cover the gas vent valve. The second trap includes a liquid retaining material made of a non-flammable material and disposed further outward of the first trap so as to oppose and cover the gas vent valve.

Abstract: A lithium ion secondary battery is disclosed that can inhibit generation of gas due to decomposition of a non-aqueous electrolyte solution. The lithium ion battery includes a cathode, a non-aqueous electrolyte solution and an anode, wherein the cathode includes a conductive material, a layered niobium-containing oxide that coats a surface of the conductive material, and a lithium-containing oxide active material having an upper-limit potential to a redox potential of metal lithium of no less than 4.5 V (vs. Li/Li+).

Abstract: A lithium ion secondary battery is disclosed that can inhibit generation of gas due to decomposition of a non-aqueous electrolyte solution. The lithium ion battery includes a cathode, a non-aqueous electrolyte solution and an anode, wherein the cathode includes a conductive material, a layered niobium-containing oxide that coats a surface of the conductive material, and a lithium-containing oxide active material having an upper-limit potential to a redox potential of metal lithium of no less than 4.5 V (vs. Li/Li+).

Abstract: A lithium ion secondary battery is disclosed that can inhibit generation of gas due to decomposition of a non-aqueous electrolyte solution. The lithium ion battery includes a cathode, a non-aqueous electrolyte solution and an anode, wherein the cathode includes a conductive material, a layered niobium-containing oxide that coats a surface of the conductive material, and a lithium-containing oxide active material having an upper-limit potential to a redox potential of metal lithium of no less than 4.5 V (vs. Li/Li+).