The disclosed technology relates to a looped tab for a battery cell. The looped tab may extend from a set of layers. The looped tab may comprise a first portion adjacent to the set of layers and a second portion adjacent to an inner sidewall of the enclosure. The first portion may comprise a covered portion, the covered portion comprising a metal surface and an oxide coating covering the metal surface, the oxide coating configured to prevent contact between a layer in the set of layers or the enclosure and the metal surface of the covered portion.

This disclosure is generally directed to coating materials for cathode active materials useful in lithium ion batteries (LIBs). The coatings include a metal fluoride (MF.sub.x), a lithium metal fluoride (Li-M-F), or both, which are stable with cathode materials such as LiFePO.sub.4, and helpful in protecting against battery degradation materials (i.e., HF, LiF, PF.sub.5.sup.−, and LiOH).

A surface-treated steel sheet for a battery container includes a steel sheet, an iron-nickel diffusion layer formed on the steel sheet, and a nickel layer formed on the iron-nickel diffusion layer and constituting the outermost layer. When the Fe intensity and the Ni intensity are continuously measured from the surface of the surface-treated steel sheet for a battery container along the depth direction with a high frequency glow discharge optical emission spectrometric analyzer, the thickness of the iron-nickel diffusion layer being the difference (D2−D1) between the depth (D1) at which the Fe intensity exhibits a first predetermined value and the depth (D2) at which the Ni intensity exhibits a second predetermined value is 0.04 to 0.31 μm; and the total amount of the nickel contained in the iron-nickel diffusion layer and the nickel contained in the nickel layer is 10.8 to 26.7 g/m2.

During a process of manufacturing a pouch case by forming a pouch film, an elongation rate can be measured by the color of an outer layer of the pouch film without separate sampling, and it can be determined whether or not elongation has occurred which causes a critical level in which a crack is about to occur or a defective level in which a crack is occurring. A method for manufacturing a pouch case of a secondary battery according to the present invention includes: stacking a metal layer above an inner layer and stacking an outer layer, which includes colored dye particles, above the metal layer, thereby producing a pouch film; forming the pouch film into a three-dimensional shape so that an electrode assembly is accommodated therein; and measuring an elongation rate of the pouch film through color of the outer layer.

An electrode plate, a battery cell, a battery and an electrical device are provided. The electrode plate includes an insulating substrate, a conductive layer, and an active material layer. The conductive layer is arranged on the surface of the insulating substrate. The active material layer is applied on the surface of the conductive layer away from the insulating substrate. The conductive layer includes a first part coated with the active material layer and a second part not coated with the active material layer. The first part and the second part are arranged along the first direction. The conductive layer has a resistivity of ρ1, a specific heat capacity of C, a density of ρ2, and a constant K=ρ1/(C.Math.ρ2). The conductive layer has a thickness of d1, the first part has a size of W along the first direction, and d1, W and K satisfy: 0.001 J/(Ω.Math.mm.sup.4.Math.° C.)≤d1/(K.Math.W)≤0.0075 J/(Ω.Math.mm.sup.4.Math.° C.).

A cell for use in an electrochemical cell, such as a lithium-ion secondary battery that includes a positive electrode with an active material that acts as a cathode and a current collector; a negative electrode with an active material that acts as an anode and a current collector; a non-aqueous electrolyte; and a separator placed between the positive and negative electrodes. At least one of the cathode, the anode, the electrolyte, and the separator includes an inorganic additive in the form of a transition phase alumina or a type of boehmite that absorbs one or more of moisture and/or hydrogen fluoride (HF) that become present in the cell. One or more cells may be combined in a housing to form a lithium-ion secondary battery. The inorganic additive may also be incorporated as a coating applied to the internal wall of the housing.

The present disclosure provides batteries that have a reduced risk or no risk of esophageal or gastrointestinal damage in a conductive aqueous environment, such as when accidentally swallowed. The batteries are, in some embodiments, nominally 9V, 3V or 1.5V coin or button cell-type batteries.

The present invention provides a small electronic device including an actuation component that operates using an electromagnetic force, a power storage device, and a case in which the actuation component and the power storage device are stored, in which the power storage device is formed of a non-magnetic body.

An aluminum pouch film for a secondary battery and a method for producing the aluminum pouch film are disclosed. The aluminum pouch film includes an aluminum layer; an outer resin layer formed on a first surface of the aluminum layer; a first adhesive layer bonding the aluminum layer and the outer resin layer; an inner resin layer formed on a second surface of the aluminum layer; and a second adhesive layer bonding the aluminum layer and the inner resin layer, wherein the outer resin layer includes a polyimide.

A battery packaging material is configured from a laminate including, at a minimum, a polyester film layer, an aluminum alloy foil layer, and a heat fusible resin layer in the stated order. The thickness of the polyester film layer is 23-27 μm (inclusive), the thickness of the aluminum alloy foil layer is 27-43 μm (inclusive), the thickness of the heat fusible resin layer is 70-100 μm (inclusive), and the insulation breakdown voltage of the surface of the polyester film layer side is 13 kV or greater.