A secondary battery includes: an electrode assembly including a first electrode plate, a second electrode plate, and a separator; a case including a first side having an opening to accommodate the electrode assembly; a cap plate sealing the first side of the case; a first current collector plate arranged between the electrode assembly and the cap plate and electrically connecting the first electrode plate and the cap plate; a terminal arranged on a second side of the case; a second current collector plate electrically connecting the second electrode plate and the terminal; a first welding portion on an outer surface of the cap plate and welding the cap plate and the first current collector plate; and a second welding portion on the outer surface of the cap plate and welding the case and the cap plate.

The present invention provides an adhesive composition that shows good adhesion to a polyolefin resin substrate and a metal substrate, and good electrolyte solution resistance, and also exhibits excellent heat resistance. The present invention also provides a laminate including an adhesive layer comprising the adhesive composition, a packaging material using the laminate for which heat resistance and electrolyte solution resistance are required, and a packaging material for a lithium-ion battery comprising the laminate as a constituent member. The adhesive composition comprises an acid-modified polyolefin (A), an isocyanate curing agent (B), and an acid anhydride group-containing compound (C), the acid anhydride group-containing compound (C) being present in an amount of 0.1 parts by mass or more and 20 parts by mass or less based on 100 parts by mass of the acid-modified polyolefin (A).

The present invention provides an adhesive composition that shows good adhesion to a polyolefin resin substrate and a metal substrate, and good electrolyte solution resistance, and also exhibits excellent heat resistance. The present invention also provides a laminate including an adhesive layer comprising the adhesive composition, a packaging material using the laminate for which heat resistance and electrolyte solution resistance are required, and a packaging material for a lithium-ion battery comprising the laminate as a constituent member. The adhesive composition comprises an acid-modified polyolefin (A), an isocyanate curing agent (B), and an acid anhydride group-containing compound (C), the acid anhydride group-containing compound (C) being present in an amount of 0.1 parts by mass or more and 20 parts by mass or less based on 100 parts by mass of the acid-modified polyolefin (A).

A packaging material for a power storage device, comprising at least: a substrate layer; a metallic foil layer with an anti-corrosion treatment layer being disposed on one face or both faces thereof; and a sealant layer in this order, wherein the sealant layer includes a polypropylene-based resin (A) and 1 to 40% by mass of incompatible component (B), and maximum seal strength S.sub.M in an adhered portion resulting from adhesion by heat-sealing the packaging material is 35 N/15 mm or more, and in addition, the packaging material for a power storage device satisfies the following requirements (1) or (2): (1) a ratio S.sub.S/S.sub.M of seal strength S.sub.S to maximum seal strength S.sub.M in a stable range is 0.3 or more; (2) a ratio S.sub.A/S.sub.M of average seal strength S.sub.A to maximum seal strength S.sub.M is 0.3 or more.

A packaging material for solid-state batteries according to one aspect of the present disclosure contains sulfide-based solid electrolytes, including at least a substrate layer, a barrier layer, and a sealant layer in this order, in which at least one of the layers constituting the packaging material contains a color developer that changes color when reacting with hydrogen sulfide.

A packaging material for solid-state batteries according to one aspect of the present disclosure contains sulfide-based solid electrolytes, including at least a substrate layer, a barrier layer, and a sealant layer in this order, in which at least one of the layers constituting the packaging material contains a color developer that changes color when reacting with hydrogen sulfide.

A battery housing for an electrical energy store at least sectionally defines a reception space for the electrical energy store and has at least two housing sections that are connected to one another while forming a joining point. The at least two mutually connected housing sections are produced from a sheet metal organically coated at least adjacent to the joining point and are adhesively bonded to a connection element at the joining point.

A battery housing for an electrical energy store at least sectionally defines a reception space for the electrical energy store and has at least two housing sections that are connected to one another while forming a joining point. The at least two mutually connected housing sections are produced from a sheet metal organically coated at least adjacent to the joining point and are adhesively bonded to a connection element at the joining point.

The disclosure provides a battery and a battery apparatus including the battery. The battery includes a housing, a positive current collector, a negative current collector and a resistor assembly. The positive current collector is disposed at the housing, and the negative current collector is disposed at the housing. The positive current collector is electrically connected to the housing through the resistor assembly, and the resistor assembly includes a first resistor and a second resistor arranged in parallel. A resistance value of the first resistor is greater than a resistance value of the second resistor. By arranging the first resistor and the second resistor arranged in parallel and configuring the resistance value of the first resistor to be greater than the resistance value of the second resistor, a total resistance value of the first resistor and the second resistor is less than the resistance value of the second resistor.

The disclosure provides a battery and a battery apparatus including the battery. The battery includes a housing, a positive current collector, a negative current collector and a resistor assembly. The positive current collector is disposed at the housing, and the negative current collector is disposed at the housing. The positive current collector is electrically connected to the housing through the resistor assembly, and the resistor assembly includes a first resistor and a second resistor arranged in parallel. A resistance value of the first resistor is greater than a resistance value of the second resistor. By arranging the first resistor and the second resistor arranged in parallel and configuring the resistance value of the first resistor to be greater than the resistance value of the second resistor, a total resistance value of the first resistor and the second resistor is less than the resistance value of the second resistor.