A button cell includes a housing consisting of two metal housing halves, an electrode separator assembly in the form of a preferably spiral-shaped winding inside the housing, and metal conductors which electrically connect the electrodes of the assembly to the housing halves, wherein at least one of the conductors is connected to the respective housing half by welding.

A negative electrode for a lithium-metal secondary battery and a lithium-metal secondary battery including the same are provided which have an excellent life characteristic and have less irregular resin phases formed on the surface the negative electrode. The negative electrode includes a polymer layer arranged in a lattice structure having vacant spaces, so that the specific surface area of the negative electrode can be increased, a uniform current density distribution can thereby be achieved, the negative electrode has excellent life characteristics, and the formation of irregular resin phases can be suppressed.

Positive electrode active material particles that inhibit a decrease in capacity due to charge and discharge cycles are provided. A high-capacity secondary battery, a secondary battery with excellent charge and discharge characteristics, or a highly-safe or highly-reliable secondary battery is provided. A novel material, active material particles, and a storage device are provided. The positive electrode active material particle includes a first region and a second region in contact with the outside of the first region. The first region contains lithium, oxygen, and an element M that is one or more elements selected from cobalt, manganese, and nickel. The second region contains the element M, oxygen, magnesium, and fluorine. The atomic ratio of lithium to the element M (Li/M) measured by X-ray photoelectron spectroscopy is 0.5 or more and 0.85 or less. The atomic ratio of magnesium to the element M (Mg/M) is 0.2 or more and 0.5 or less.

A secondary battery and its preparation method, the secondary battery having a negative electrode containing a negative current collector and no negative active material; an electrolyte having an electrolyte salt and an organic solvent; a separator; a positive electrode having a positive active material layer containing a positive active material, wherein the positive active material comprises a material having a layered crystal structure; and a battery case used for packaging. Main active component of the secondary battery is the positive active material having a layered crystal structure, which is environmentally-friendly and low in cost; meanwhile, negative active material is not needed by the second battery system, thereby remarkably reducing the weight and cost of the battery and improving the battery energy density. The reaction mechanism adopted by the secondary battery significantly increases the working voltage of the battery and further improves the energy density of the battery.

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.

A coin cell having a hermetic design withstands high performance applications including high temperature missions from a drop in replacement envelope. The coin cell can include a container having a bottom wall and a surrounding wall that form an interior volume, and the surrounding wall can include an inner, upper peripheral edge, at a top of the surrounding wall. The coin cell can include an anode assembly; a cathode assembly; and a header ring including a header ring outer surface and a header ring inner surface that defines an opening. The coin cell can include an insulator ring that includes an insulator ring outer surface that extends along and inside of the header ring inner surface, and an insulator ring inner surface that defines an opening within the insulator ring. A pin can be provided in the opening of the insulator ring. The coin cell can include an electrolyte.

A battery cell comprising a composite water-responsive safety layer and/or composite water- and pH-responsive safety layer to protect against tissue damage and/or electrolysis, when the battery cell is exposed to aqueous solution or tissue, is provided. The composite water-responsive safety layer and/or composite water- and pH-responsive safety layer is adapted to change from a non-electronically conducting state to an electronically conducting state.

A button cell includes a housing having a cell cup, the cell cup having a flat bottom area, a cell cup casing, and a bottom edge forming a transition between the flat bottom area and the cell cup casing, and a cell top, the cell top having a flat top area and a cell top casing. An electrode-separator assembly winding is disposed within the housing, the electrode-separator assembly winding including a multi-layer assembly that is wound in a spiral shape about an axis, the multi-layer assembly including a separator disposed between a positive electrode and a negative electrode, and a first output conductor. An insulator is disposed between an end face of the electrode-separator assembly winding and the first output conductor, wherein the first output conductor is welded to the first of the flat bottom area or the flat top area.

A method for producing a button cell includes providing a cell cup, the cell cup having a flat bottom area and a cell cup casing; providing a cell top, the cell top having a flat top area and a cell top casing having a first height; and providing an electrode-separator assembly winding. The cell top casing and the cell cup casing form an overlap area extending in a direction parallel to the axis of the winding and having a second height, the second height being between 20% and 99% of the first height. The method includes applying, in a radial direction perpendicular to the axis of the winding, a pressure on the cell cup casing so as to seal the housing, wherein a portion of the cell top casing that is cylindrical forms at least a part of the overlap area.

A button cell includes a housing having a metal cell cup having a cell cup plane region and a metal cell top having a cell top plane region. An electrode winding is disposed within the housing, the electrode winding having a first end side and a second end side, the electrode winding being formed from a multi-layer assembly wound in a spiral shape, the multi-layer assembly including a positive electrode formed from a current collector. A conductor is connected to the current collector, wherein the conductor at least partially lies flat between (i) the first end side of the electrode winding and (ii) a first of the cell cup plane region or the cell top plane region. The first conductor is welded to the first of the cell cup plane region or the cell top plane region. An insulator is positioned between the first conductor and the electrode winding.