A winding type battery cell includes a roll core and at least one electrode sheet unit. The roll core includes a positive connection part, a negative connection part and an insulation part located between the positive connection part and the negative connection part. The positive connection part and the negative connection part are respectively connected with two ends of the insulation part. The electrode sheet unit includes a positive electrode sheet, a negative electrode sheet and a separator. The positive electrode sheet and the negative electrode sheet are separated by the separator. The positive electrode sheet is connected with the positive connection part, and the negative electrode sheet is connected with the negative connection part. The winding type battery cell is formed by winding the electrode sheet unit around the roll core. A winding battery with the winding type battery cell is also provided.

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. At least a portion of the first portion and at least a portion of the second portion comprise a covered portion. The covered portion comprises a metal surface and an oxide coating covering the metal surface. The oxide coating is configured to prevent contact between a layer in the set of layers or the inner sidewall of the enclosure and the metal surface.

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. At least a portion of the first portion and at least a portion of the second portion comprise a covered portion. The covered portion comprises a metal surface and an oxide coating covering the metal surface. The oxide coating is configured to prevent contact between a layer in the set of layers or the inner sidewall of the enclosure and the metal surface.

A battery is provided in which a damage on an electrode tab group is suitably inhibited. In one suitable embodiment of the battery herein disclosed, an insulating member is provided on a sealing plate. An insulation sheet arranged to cover an electrode body is joined to the insulating member, and the insulation sheet includes a sheet bottom wall, a pair of sheet first side walls that are configured to extend from the sheet bottom wall and are opposed mutually, and a pair of sheet second side walls that extend from the sheet bottom wall and are opposed mutually.

A battery is provided in which a damage on an electrode tab group is suitably inhibited. In one suitable embodiment of the battery herein disclosed, an insulating member is provided on a sealing plate. An insulation sheet arranged to cover an electrode body is joined to the insulating member, and the insulation sheet includes a sheet bottom wall, a pair of sheet first side walls that are configured to extend from the sheet bottom wall and are opposed mutually, and a pair of sheet second side walls that extend from the sheet bottom wall and are opposed mutually.

A main object of the present disclosure is to provide an all solid state battery in which occurrence of short circuit is inhibited. The present disclosure achieves the object by providing an all solid state battery including an anode including at least an anode current collector, a cathode, and a solid electrolyte layer arranged between the anode and the cathode; wherein a protective layer containing a Mg-containing particle that contains at least Mg, and also contains a polymer, is arranged between the anode current collector and the solid electrolyte layer; and a contacting area rate in an interface between the solid electrolyte layer and the protective layer is 50% or more.

A main object of the present disclosure is to provide an all solid state battery in which occurrence of short circuit is inhibited. The present disclosure achieves the object by providing an all solid state battery including an anode including at least an anode current collector, a cathode, and a solid electrolyte layer arranged between the anode and the cathode; wherein a protective layer containing a Mg-containing particle that contains at least Mg, and also contains a polymer, is arranged between the anode current collector and the solid electrolyte layer; and a contacting area rate in an interface between the solid electrolyte layer and the protective layer is 50% or more.

A main object of the present disclosure is to provide an all solid state battery in which occurrence of short circuit is inhibited. The present disclosure achieves the object by providing an all solid state battery comprising an anode including at least an anode current collector, a cathode, and a solid electrolyte layer arranged between the anode and the cathode; wherein a protective layer containing a Mg-containing particle that contains at least Mg, and also containing a polymer, is arranged between the anode current collector and the solid electrolyte layer; the solid electrolyte layer contains a solid electrolyte in a granular shape; and when X designates an average particle size D.sub.50 of the solid electrolyte and Y designates an average thickness of the solid electrolyte layer, X/Y is 0.0125 or more and 0.02 or less.

A main object of the present disclosure is to provide an all solid state battery in which occurrence of short circuit is inhibited. The present disclosure achieves the object by providing an all solid state battery comprising an anode including at least an anode current collector, a cathode, and a solid electrolyte layer arranged between the anode and the cathode; wherein a protective layer containing a Mg-containing particle that contains at least Mg, and also containing a polymer, is arranged between the anode current collector and the solid electrolyte layer; the solid electrolyte layer contains a solid electrolyte in a granular shape; and when X designates an average particle size D.sub.50 of the solid electrolyte and Y designates an average thickness of the solid electrolyte layer, X/Y is 0.0125 or more and 0.02 or less.

The present disclosure provides a battery core assembly, a battery, a battery pack, and a vehicle. The battery core assembly includes an encapsulation film and an electrode core assembly encapsulated in the encapsulation film. The electrode core assembly includes an electrode core assembly body and two electrode lead-out members of opposite polarities electrically connected to the electrode core assembly body. The electrode core assembly body includes at least two electrode cores connected in parallel. Each of the electrode cores includes an electrode core body and two tabs of opposite polarities that are electrically connected to the electrode core body. The electrode core assembly body further includes a tab support. The two electrode lead-out members are respectively electrically connected to one of the tab supports located two sides of the electrode core assembly body in a first direction.