A secondary battery includes a gas discharge portion configured to discharge only gas, whereby safety of the secondary battery is improved while performance and lifespan of the secondary battery are improved. Also described are a secondary battery manufacturing method, and more particularly a secondary battery including an electrode assembly and a case including a receiving portion configured to receive the electrode assembly, a sealed portion formed as the result of hermetically sealing the periphery of the receiving portion, and a gas discharge portion disposed in the sealed portion, the gas discharge portion having one end disposed in contact with the receiving portion and the other end disposed in contact with the outside, the gas discharge portion being configured to selectively discharge only gas.

An exterior material for power storage devices which is formed from at least a layered body comprising a base material layer, a barrier layer, and a heat-fusible resin layer in this order, wherein the base material layer contains a resin film, the resin film has a shrinkage ratio of 1.0% to less than 5.0% when immersed in hot water at 95° C. for 30 minutes, and the resin film has a stress value, at 10% stretching in the tensile test described hereafter, of 100 MPa or higher in both the machine direction and the transverse direction. After storing a sample in a 23° C., 40% RH environment for 24 hours, the tensile test is performed under conditions of a sample width of 6 mm, a gauge length of 35 mm, and a tension rate of 300 mm/min in a 23° C., 40% RH environment, and the stress value at 10% stretching (displacement of 3.5 mm) is measured.

A pouch-type battery case according to an embodiment of the present invention includes a cup part configured to accommodate an electrode assembly, in which electrodes and separators are stacked, therein, wherein the cup part includes a plurality of punch edges configured to connect a plurality of outer walls configured to surround a periphery thereof to a bottom part, respectively, and each of the punch edge being rounded with a curvature radius of 1 mm or less.

A pouch-type battery case according to an embodiment of the present invention includes a cup part configured to accommodate an electrode assembly, in which electrodes and separators are stacked, therein, wherein the cup part includes a plurality of punch edges configured to connect a plurality of outer walls configured to surround a periphery thereof to a bottom part, respectively, and each of the punch edge being rounded with a curvature radius of 1 mm or less.

A power storage device packaging material includes a laminate including at least a base material layer, a barrier layer, and a heat-sealable resin layer in this order, wherein the base material layer contains a polyester film, and the polyester film has a work hardening exponent of 1.6 or more and 3.0 or less in both longitudinal and width directions, with a difference of 0.5 or less between the work hardening exponents in the longitudinal and width directions, an intrinsic viscosity of 0.66 or more and 0.95 or less, and a rigid amorphous fraction of 28% or more and 60% or less.

A packaged solid-state battery that includes a solid-state battery having a top surface, a bottom surface, and side surfaces connecting the top surface to the bottom surface; a supporting substrate supporting the bottom surface of the solid-state battery; an insulating cover layer covering at least the top surface and the side surfaces of the solid-state battery; and an inorganic cover film on the insulating cover layer.

A packaged solid-state battery that includes a solid-state battery having a top surface, a bottom surface, and side surfaces connecting the top surface to the bottom surface; a supporting substrate supporting the bottom surface of the solid-state battery; an insulating cover layer covering at least the top surface and the side surfaces of the solid-state battery; and an inorganic cover film on the insulating cover layer.

Disclosed is a battery cell including a battery case having an accommodation portion in which an electrode assembly is mounted, and a sealing portion formed by sealing an outer periphery thereof. A gas discharge unit can be inserted into the sealing portion and fused together with the sealing portion. The gas discharge unit including a first layer and a second layer and having a folded structure based on a first border line such that the gas discharge unit is open toward the inside of the battery case and the first layer becomes an outer surface of the gas discharge unit. The first layer and the sealing portion being in contact with each other.

Disclosed is a battery cell including a battery case having an accommodation portion in which an electrode assembly is mounted, and a sealing portion formed by sealing an outer periphery thereof. A gas discharge unit can be inserted into the sealing portion and fused together with the sealing portion. The gas discharge unit including a first layer and a second layer and having a folded structure based on a first border line such that the gas discharge unit is open toward the inside of the battery case and the first layer becomes an outer surface of the gas discharge unit. The first layer and the sealing portion being in contact with each other.

A battery pack protects the internal battery pack components from the heat, e.g., heat generated during a sterilization process of an autoclave. The battery pack prevents the heat of the autoclave from damaging the battery cells and other electronic components within a battery pack housing. The battery pack may include a multi-layer thermal protection portion lining an inside surface of the walls of the battery pack housing with a combination of materials designed to limit the amount of heat to which the internal components of the battery will be exposed for the duration of a traditional autoclave sterilization cycle. Additionally, the battery pack may include a thermal protection casing around connection elements, such as wires and contacts, between a battery pack contact and the battery cells, to limit the heat rise from the heat of the autoclave in or on the connection elements of the battery pack.