An adhesive film for a metal terminal, interposed between a metal terminal electrically connected to an electrode of a power storage device element and a power storage device packaging material for sealing the power storage device element, wherein the adhesive film for a metal terminal includes a laminate sequentially including a first polyolefin layer on the metal terminal side, a base material, and a second polyolefin layer on the power storage device packaging material side, the laminate has a first adhesive layer between the first polyolefin layer and the base material, a second adhesive layer between the second polyolefin layer and the base material, or both the first adhesive layer and the second adhesive layer, the base material has a melting peak temperature of 135° C. or more, and at least one of the first adhesive layer and the second adhesive layer has a melting peak temperature of 100° C. or less.

An adhesive film for a metal terminal, interposed between a metal terminal electrically connected to an electrode of a power storage device element and a power storage device packaging material for sealing the power storage device element, wherein the adhesive film for a metal terminal includes a laminate sequentially including a first polyolefin layer on the metal terminal side, a base material, and a second polyolefin layer on the power storage device packaging material side, the laminate has a first adhesive layer between the first polyolefin layer and the base material, a second adhesive layer between the second polyolefin layer and the base material, or both the first adhesive layer and the second adhesive layer, the base material has a melting peak temperature of 135° C. or more, and at least one of the first adhesive layer and the second adhesive layer has a melting peak temperature of 100° C. or less.

A solid state battery that includes: a battery element including a positive electrode layer, a negative electrode layer, and a solid electrolyte layer interposed between the positive electrode layer and the negative electrode layer; a composite protective layer covering the battery element, wherein the composite protective layer includes a first protective layer and a second protective layer arranged around the battery element so as to have an overlapping region where the first protective layer and the second protective layer overlap each other; and a conducting part capable of extracting electricity from the battery element to an outside of the solid state battery, the conducting part extending from the overlapping region to the outside of the solid state battery.

A solid state battery that includes: a battery element including a positive electrode layer, a negative electrode layer, and a solid electrolyte layer interposed between the positive electrode layer and the negative electrode layer; a composite protective layer covering the battery element, wherein the composite protective layer includes a first protective layer and a second protective layer arranged around the battery element so as to have an overlapping region where the first protective layer and the second protective layer overlap each other; and a conducting part capable of extracting electricity from the battery element to an outside of the solid state battery, the conducting part extending from the overlapping region to the outside of the solid state battery.

A battery includes, stacked successively above a first face of a support, in a stacking direction, at least a cathode including a lower face, an upper face and a side wall directed in the stacking direction from the lower face to the upper face, a solid electrolyte, an anode, the battery including a coating portion surrounding, and in contact with, all of the side wall of the cathode, without covering the upper face of the cathode.

A rechargeable battery includes: an electrode assembly including a first electrode, a second electrode, and a separator disposed between the first electrode and the second electrode; a case that is connected to the first electrode to accommodate the electrode assembly, and includes an opening exposing the electrode assembly and a first side wall forming the opening; a cap plate that is coupled to the case to cover an outer area of the opening, and includes a through-hole exposing a central area of the opening and a second side wall overlapping the first side wall in a horizontal direction; a terminal plate that is connected to the second electrode to be insulation-bonded to the cap plate and covers the through-hole; and a first bonding layer that is positioned between the first side wall of the case and the second side wall of the cap plate, and bonds the first side wall and the second side wall.

A rechargeable battery includes: an electrode assembly including a first electrode, a second electrode, and a separator disposed between the first electrode and the second electrode; a case that is connected to the first electrode to accommodate the electrode assembly, and includes an opening exposing the electrode assembly and a first side wall forming the opening; a cap plate that is coupled to the case to cover an outer area of the opening, and includes a through-hole exposing a central area of the opening and a second side wall overlapping the first side wall in a horizontal direction; a terminal plate that is connected to the second electrode to be insulation-bonded to the cap plate and covers the through-hole; and a first bonding layer that is positioned between the first side wall of the case and the second side wall of the cap plate, and bonds the first side wall and the second side wall.

An electrode assembly includes a first electrode plate, a second electrode plate, and a separator. The electrode assembly is formed by winding the first electrode plate, the separator, and the second electrode plate. The electrode assembly further includes a first tab, a second tab, and a third tab. The first tab is disposed on the first electrode plate. The third tab and the second tab are disposed on the second electrode plate. In a thickness direction of the electrode assembly projections of the first tab, the second tab, and the third tab do not overlap. The electrode assembly is provided with a multi-tab structure, and uses a plurality of parallel-connected tabs to shunt a current to achieve purposes of enhancing a curent-carrying capacity of a battery and reducing a temperature rise. This application further provides a battery containing the electrode assemby.

An all solid battery includes a multilayer chip in which each of a plurality of solid electrolyte layers including solid electrolyte and each of a plurality of internal electrodes including an electrode active material are alternately stacked, the multilayer chip having a rectangular parallelepiped shape, the plurality of internal electrodes being alternately exposed to two side faces of the multilayer chip other than two end faces of a stacking direction of the multilayer chip, and a pair of external electrodes that contacts the two side faces. At least one of the pair of external electrodes includes an electrode active material of which a pole is a same as that of an electrode active material of the internal electrode which contacts the one of the pair of external electrodes.

A battery cell may include a housing, an electrode assembly, and a pole. The housing may be integrally formed and include two first side walls arranged opposite each other in a first direction and two second side walls arranged opposite each other in a second direction, the two first side walls and the two second side walls may enclose an accommodating cavity, the housing may have at least one opening in a third direction, and the first direction, the second direction, and the third direction are perpendicular to one another. The electrode assembly may be accommodated in the accommodating cavity, and the electrode assembly may include a body structure and a tab protruding out of the body structure.