This invention concerns an electrochemical element, in particular a sulphurous solid electrolyte element, comprising a protective casing, as well as modules and batteries comprising such elements.

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.

Disclosed is a packaging for a flexible secondary battery comprising a first polymer resin layer, a barrier layer formed on the first polymer resin layer to block water and gas, and a second polymer resin layer formed on the barrier layer. The thickness of the barrier layer is 30 to 999 nm. The barrier layer is multi-layered, and comprises graphene, a dispersing agent, and pyrene as a flexible linking agent, in which there is π-π conjugation (interaction) between the graphene and the pyrene. Also disclosed is a flexible secondary battery comprising the packaging.

Disclosed is a packaging for a flexible secondary battery comprising a first polymer resin layer, a barrier layer formed on the first polymer resin layer to block water and gas, and a second polymer resin layer formed on the barrier layer. The thickness of the barrier layer is 30 to 999 nm. The barrier layer is multi-layered, and comprises graphene, a dispersing agent, and pyrene as a flexible linking agent, in which there is π-π conjugation (interaction) between the graphene and the pyrene. Also disclosed is a flexible secondary battery comprising the packaging.

A cell includes a housing and at least one electrode core assembly array encapsulated inside the housing. The electrode core assembly array includes N rows and M columns of electrode core assemblies, and the electrode core assembly includes an encapsulation film and at least one electrode core encapsulated inside the encapsulation film. The electrode core assemblies are arranged in rows, and each row includes M electrode core assemblies. The electrode core assemblies are arranged in columns, and each column includes N electrode core assemblies. The N electrode core assemblies in each column are connected in series to form an electrode core assembly string. The M electrode core assembly strings are connected in series. An air pressure between the metal housing and the encapsulation film is lower than an air pressure outside the metal housing.

A battery module according to an embodiment of the present disclosure includes a battery cell stack in which a plurality of battery cells are stacked, and a module frame for housing the battery cell stack, wherein the battery cell comprises a pouch case and an electrode assembly housed in the pouch case, and wherein a foam pad layer for controlling cell swelling is located at the outermost part of the pouch case.

A battery module according to an embodiment of the present disclosure includes a battery cell stack in which a plurality of battery cells are stacked, and a module frame for housing the battery cell stack, wherein the battery cell comprises a pouch case and an electrode assembly housed in the pouch case, and wherein a foam pad layer for controlling cell swelling is located at the outermost part of the pouch case.

A power storage device packaging material including at least a substrate layer, an outer adhesive layer, a barrier layer, and a sealant layer in this order, wherein a difference in linear expansion coefficient at 20 to 150° C. between the substrate layer and the barrier layer is 20×10.sup.−6/° C. or less in both an MD direction and a TD direction.

A power storage device packaging material including at least a substrate layer, an outer adhesive layer, a barrier layer, and a sealant layer in this order, wherein a difference in linear expansion coefficient at 20 to 150° C. between the substrate layer and the barrier layer is 20×10.sup.−6/° C. or less in both an MD direction and a TD direction.