Methods and systems for adhesively bonding a first substrate to a second substrate to reduce pull-off stress during separation of the first and second substrates include applying a first adhesive to a first bonding region of a bonding area of the first substrate, applying a second adhesive, which has an adhesive strength that is lower than an adhesive strength of the first adhesive, to a second bonding region of the bonding area of the first substrate, pressing the first and second substrates against each other to form an adhesive bondline, and curing the first and second adhesives for a predetermined period of time to form a cured adhesive bondline between the first and second substrates.

A battery assembly includes a battery that has a top surface surrounded by a circumferential edge; and a removable tab attached to the top surface. The removable tab includes a first tab end and an oppositely disposed second tab end; a gripping region disposed adjacent to the first tab end; and a battery cell attachment region disposed adjacent to the second tab end and attached to the top surface of the battery. The battery cell attachment region has first and second oppositely disposed sidewalls, wherein the second tab end is curved inwardly away from the circumferential edge of the battery such that a portion of the top surface of the battery is exposed between the second tab end and the circumferential edge of the battery

A battery cell stack of the present invention includes a plurality of battery cells and a resin layer wholly or partially in contact with an outer surface of at least one of the plurality of battery cells, wherein the resin layer includes a solvent-free adhesive, and has specific peel strength and shear strength, such that the resin layer may be applied by a spray coating, and thereby improving structural stability and reliability of the battery cell stack, while simplifying materials and processes necessary to manufacture the battery cell stack.

A method for manufacturing a battery cell stack according to exemplary embodiments of the present invention includes an application step of spraying an adhesive resin composition on one surface of a battery cell in one direction by a plurality of nozzles, wherein the nozzles are disposed in a direction different from the one direction, and at least two nozzles of the plurality of nozzles apply the adhesive resin composition in amounts different from each other. Thereby, the adhesive resin composition is applied to one surface of a non-flat battery cell, and the application amount is controlled according to portions to be applied, so that the one surface may bring into contact with another surface of another battery cell adhered thereon over an entire area in which the adhesive resin composition is applied.

A battery (2) comprising a pressure sensitive adhesive sheet (1) and an electrolyte solution, wherein: the pressure sensitive adhesive sheet is provided at a site in the battery in which there is a possibility of contact with the electrolyte solution; the pressure sensitive adhesive sheet comprises a base material (11) and a pressure sensitive adhesive layer (13) laminated at one side of the base material; and the pressure sensitive adhesive layer (13) is formed of a pressure sensitive adhesive composition comprising: a (meth)acrylic ester polymer having a main chain containing (meth)acrylic alkyl ester monomer units having a carbon number of an alkyl group of 6 or more and 20 or less, and carboxy group-containing monomer units, wherein the (meth)acrylic alkyl ester monomer units having a carbon number of an alkyl group of 6 or more and 20 or less contain 2-ethylhexyl (meth)acrylates and (meth)acrylic alkyl ester monomer units having a carbon number of an alkyl group of 10 or more and 20 or less.

A sealing film forms a seal between a first metal base body and a second base body. The sealing film includes a first adhesive layer, a second adhesive layer, and a base material layer. The first adhesive layer mainly contains an acid-modified polyolefin and adheres to the first base body. The second adhesive layer mainly contains a polyolefin and adheres to the second base body. The base material layer is provided between the first adhesive layer and the second adhesive layer. The thickness of the first adhesive layer is at least 25 and at most 70 when the total thickness of the sealing film is defined as 100. The thickness of the base material layer is at least 25 and at most 70. The thickness of the second adhesive layer is at least 5 and at most 50.

A laminate for a battery with a polypropylene adhesive layer and a metal substrate layer: (1) the adhesive includes 40-94 wt % of a propylene copolymer (A), 3-30 wt % of a butene-containing copolymer (B), 3-30 wt % of an ethylene-α-olefin copolymer (C) ((A), (B), and (C) is 100 wt %), (2) the copolymer (A) has a melting point of 130° C. or more measured with a differential scanning calorimeter, and a total proportion of a structural unit derived from ethylene is 4-25 mol % relative to 100 mol % of a total structural units forming all the copolymers (A) contained in the adhesive, (3) the copolymer (B) includes less than 1 mol % of a structural unit derived from ethylene, and has a melting point of 100° C. or less measured with a differential scanning calorimeter, and (4) the copolymer (C) includes 50-99 mol % of a structural unit derived from ethylene.

An adhesive tape includes a composite membrane and an adhesive layer, where the composite membrane includes a substrate and a hardening layer provided on a surface of the substrate, and a hardness of the hardening layer is 3H to 9H. The adhesive tape provided in this application has both small thickness and high hardness, which increases volumetric energy density of the electrochemical apparatus and can further effectively avoid tape wrinkling of the electrochemical apparatus.

A hot melt adhesive sheet according to the present invention is a hot melt adhesive sheet including a base material having at least one surface on which an adhesive layer made of a hot melt adhesive is disposed. The hot melt adhesive includes a crosslinked product of an adhesive composition including a crosslinking agent, and includes a polyurethane resin, an epoxy resin, an isocyanate-based crosslinking agent, and a crystalline polyester resin. The epoxy resin includes a bisphenol A type epoxy resin and a rubber-modified epoxy resin. The crystalline polyester resin has a number average molecular weight Mn of 33,000 or less, and a glass transition temperature Tg of 5 C. or less. The isocyanate-based crosslinking agent is included in an amount of 14 mass parts or less based on 100 mass parts of a total of the polyurethane resin and the crystalline polyester resin.

The double-sided tape for fixing an electrode constituent body is used in an electrochemical device that houses in a pouch-type outer casing an electrode constituent body wherein a positive electrode member, a separator member and a negative electrode member are layered or wound. The double-sided tape comprises a surface having a pressure-sensitive adhesive for adhering to the electrode constituent body, and a surface having a heat-sensitive adhesive for adhering to the pouch-type outer casing.