A secondary battery includes an outer package member, a battery device, and an adhesive member. The outer package member has flexibility. The battery device is contained inside the outer package member, and includes a positive electrode and a negative electrode. The positive electrode and the negative electrode are opposed to each other and are wound. The adhesive member is disposed between the outer package member and the battery device. The adhesive member is adhered to each of the outer package member and the battery device. The positive electrode and the negative electrode are wound in such a manner that the positive electrode or the negative electrode is disposed in an outermost wind. The adhesive member includes a non-heat adhesive layer and a heat adhesive layer. The non-heat adhesive layer is adhered to the outer package member. The heat adhesive layer is adhered to the battery device and includes oriented polystyrene.

A nonaqueous electrolyte rechargeable battery includes an electrode body, a nonaqueous electrolyte, and a rectangular box-shaped battery case accommodating the electrode body and the nonaqueous electrolyte. The electrode body includes a positive electrode including a positive base and a positive composite material layer, a negative electrode including a negative base and a negative composite material layer, and a porous resin separator disposed therebetween. The electrode body has a low profile when the positive electrode, the negative electrode, and the separator are laminated and rolled. When spring constant of the nonaqueous electrolyte rechargeable battery with a load of 316 to 210 N/cm.sup.2 and 95 to 74 N/cm.sup.2 is respectively referred to as spring constant H and spring constant L, the ratio L/H is 0.34 or greater and 0.41 or less. A resistance increase rate between before and after a square wave test is less than or equal to 1.17.

A nonaqueous electrolyte rechargeable battery includes an electrode body, a nonaqueous electrolyte, and a rectangular box-shaped battery case accommodating the electrode body and the nonaqueous electrolyte. The electrode body includes a positive electrode including a positive base and a positive composite material layer, a negative electrode including a negative base and a negative composite material layer, and a porous resin separator disposed therebetween. The electrode body has a low profile when the positive electrode, the negative electrode, and the separator are laminated and rolled. When spring constant of the nonaqueous electrolyte rechargeable battery with a load of 316 to 210 N/cm.sup.2 and 95 to 74 N/cm.sup.2 is respectively referred to as spring constant H and spring constant L, the ratio L/H is 0.34 or greater and 0.41 or less. A resistance increase rate between before and after a square wave test is less than or equal to 1.17.

A cell array, including a plurality of cells arranged in sequence is provided. Each of the plurality of cells includes a housing and an electrode core. The electrode core includes an electrode plate. The electrode plate includes a current collector and a coating layer arranged on the current collector. The cell array satisfies the following formula 1: (1−JR.sub.w)+(SR.sub.w−1)=10%−15%. JR.sub.w is an expansion space for the electrode core inside each of the plurality of cells in a first direction, SR.sub.w is an expansion space outside the plurality of cells in the first direction, and a thickness direction of each of the plurality of cells is defined as the first direction. JR.sub.w=P.sub.w/(Cell.sub.w−K.sub.w−C.sub.w). SR.sub.w=(M.sub.w−MN.sub.w)/(Cell.sub.n×Cell.sub.w).

Provided is a secondary battery, including: an electrode assembly, a packing bag, an electrode lead and an insulation part; the electrode assembly is housed in the packing bag having a sealing part on edge, and the electrode lead is connected to the electrode assembly and passes through the sealing part. The sealing part includes a main body area, a first step area and a first transition area which are located on same side of the electrode lead along width direction, and the main body area, first transition area and first step area are successively arranged along direction approaching the electrode lead; the insulation part is wrapped around the electrode lead, and has a first portion which is located on a side of the electrode lead close to the main body area along width direction and covered by the first step area on both sides in thickness direction.

Provided is a packaging material for batteries, which has excellent insulating properties. A packaging material for batteries, which is formed of a laminate that is obtained by sequentially laminating at least a base layer, a bonding layer, a metal layer and a sealant layer, and wherein the base layer comprises a resin layer A that is formed of a thermoplastic resin having a volume resistivity of 1×10.sup.15 Ω.Math.cm or more.

Battery including at least one unit cell formed by an anode, an electrolyte, and a cathode, defining a stack. The stack of the battery has a plurality of faces that includes two end faces opposite one another, two lateral faces opposite one another, and two longitudinal faces opposite one another. The first longitudinal face includes at least one anode connection zone and a second longitudinal face of the battery includes at least one cathode connection zone that is laterally opposite to the at least one anode connection zone. In a first longitudinal direction of the battery, each anode current-collecting substrate protrudes from each anode layer, from each layer of electrolyte material or layer of a separator impregnated with an electrolyte, from each cathode layer and from each cathode current-collecting substrate layer. In a second longitudinal direction of the battery that is opposite to the first longitudinal direction, each cathode current-collecting substrate protrudes from each anode layer, from each layer of electrolyte material, or layer of a separator impregnated with an electrolyte, from each cathode layer and from each anode current-collecting substrate layer.

Battery including at least one unit cell formed by an anode, an electrolyte, and a cathode, defining a stack. The stack of the battery has a plurality of faces that includes two end faces opposite one another, two lateral faces opposite one another, and two longitudinal faces opposite one another. The first longitudinal face includes at least one anode connection zone and a second longitudinal face of the battery includes at least one cathode connection zone that is laterally opposite to the at least one anode connection zone. In a first longitudinal direction of the battery, each anode current-collecting substrate protrudes from each anode layer, from each layer of electrolyte material or layer of a separator impregnated with an electrolyte, from each cathode layer and from each cathode current-collecting substrate layer. In a second longitudinal direction of the battery that is opposite to the first longitudinal direction, each cathode current-collecting substrate protrudes from each anode layer, from each layer of electrolyte material, or layer of a separator impregnated with an electrolyte, from each cathode layer and from each anode current-collecting substrate layer.

A lithium ion secondary battery includes a pair of exterior films having outer edges bonded together in a stacked state to form an internal space, a battery body housed in the internal surface, a positive electrode tab terminal connected to the battery body in between the pair of exterior films and extending to an outside, and a negative electrode tab terminal connected to the battery body in between the pair of exterior films and extending to the outside. The pair of exterior films each include a first resin layer constituting an inner surface, the inner surfaces opposing each other. The inner surface of at least one of the pair of exterior films has a plurality of projections arranged thereon apart from each other.

A lithium ion secondary battery includes a pair of exterior films having outer edges bonded together in a stacked state to form an internal space, a battery body housed in the internal surface, a positive electrode tab terminal connected to the battery body in between the pair of exterior films and extending to an outside, and a negative electrode tab terminal connected to the battery body in between the pair of exterior films and extending to the outside. The pair of exterior films each include a first resin layer constituting an inner surface, the inner surfaces opposing each other. The inner surface of at least one of the pair of exterior films has a plurality of projections arranged thereon apart from each other.