This application provides a battery pack, a vehicle, and an energy storage device. The battery pack includes at least one battery sequence. The battery sequence includes a plurality of batteries. A thickness of each battery extends along a first direction. The plurality of batteries are successively arranged along the first direction to form the battery sequence. At least one of the batteries includes a casing and a core packaged in the casing. A gap exists between at least two neighboring batteries. A ratio of the gap to the thickness of the battery is c, and c satisfies the following relational expression: c/a=0.01-0.5, where a represents an expansion rate of the battery.

An embodiment of the present invention relates to a pouch-type secondary battery. According to embodiment of the present invention, the pouch-type secondary battery includes: an case configured to house an electrode assembly from which electrode tab are drawn out; sealing parts formed by adhering the case along outer peripheries of the electrode assembly; and folding parts formed by folding the sealing parts of surfaces on which the electrode tab drawn to an outside of the case is not formed, wherein a length of the folding part has a relationship with a thickness of the electrode assembly as the following equation: H≤T/2 (wherein, H is the height of the folded folding part, T is the thickness of the electrode assembly, based on a cross-section perpendicular to a direction in which the electrode tabs of the electrode assembly are drawn out).

Disclosed is a battery cell, which includes a battery case having an accommodation portion in which a battery assembly is positioned, and a sealing portion formed by sealing an outer periphery thereof by heat fusion; an electrode lead electrically connected to an electrode tab included in the battery assembly, the electrode lead protruding out of the battery case through the sealing portion; and a lead film positioned adjacent to the sealing portion on at least one of a first side and a second side of the electrode lead, wherein the lead film includes a gas discharge portion formed to extend from an inside of the battery case to an outside of the battery case, and the gas discharge portion is opened on a side disposed inside of the battery case.

A pouch cell includes a copper foil forming a pouch, an active material layer adjacent to the copper foil inside the pouch forming a cathode with the copper, and a lithium-based anode inside the pouch. The cell includes a separator interposing the one active material layer and the lithium-based anode, and an electrolyte.

A flexible multi-layer packaging material is provided. The packaging material includes a first film layer, a second film in layer, and at least one electrochemical cell located within the first and second film layers. The electrochemical cell comprises an anode, a cathode, an anode current collector, a cathode current collector, and an electrolyte by which the anode and the cathode are ionically connected. At least one of the first and second film layers is a multi-layer laminate comprising an outer insulating layer, an inner insulating layer, and a conductive moisture barrier layer between the inner and outer insulating layers and in electrical contact with the electrolyte, wherein the conductive moisture barrier layer comprises an anode material such that the conductive moisture barrier layer defines both the anode and the anode current collector of the at least one electrochemical cell or wherein the conductive moisture barrier layer comprises a cathode material such that the conductive moisture barrier layer defines both the cathode and the cathode current collector of the at least one electrochemical cell. A battery pouch cell and a pack of consumer goods comprising a container formed from such a packaging material are also provided.

A flexible multi-layer packaging material is provided. The packaging material includes a first film layer, a second film in layer, and at least one electrochemical cell located within the first and second film layers. The electrochemical cell comprises an anode, a cathode, an anode current collector, a cathode current collector, and an electrolyte by which the anode and the cathode are ionically connected. At least one of the first and second film layers is a multi-layer laminate comprising an outer insulating layer, an inner insulating layer, and a conductive moisture barrier layer between the inner and outer insulating layers and in electrical contact with the electrolyte, wherein the conductive moisture barrier layer comprises an anode material such that the conductive moisture barrier layer defines both the anode and the anode current collector of the at least one electrochemical cell or wherein the conductive moisture barrier layer comprises a cathode material such that the conductive moisture barrier layer defines both the cathode and the cathode current collector of the at least one electrochemical cell. A battery pouch cell and a pack of consumer goods comprising a container formed from such a packaging material are also provided.

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.

A device for manufacturing a battery cell according to one embodiment of the present disclosure includes a sealing tool that forms a sealing part on the outer peripheral surface of a battery case to which an electrode assembly is mounted, wherein the sealing tool comprises a sealing surface that is brought into contact with the outer peripheral surface of the battery case, and wherein the sealing surface comprises a central surface and an inclined surface formed on at least one side of the central surface.

A secondary battery includes outer package members each having flexibility and a battery device. The outer package members each include a thermal-fusion-bonding layer. The battery device is contained in an inside of the outer package members, and includes a positive electrode, a negative electrode, and an electrolytic solution. The outer package members are sealed at a thermal-fusion-bonding part. The thermal-fusion-bonding part is formed by the thermal-fusion-bonding layers being thermal-fusion-bonded to each other. The thermal-fusion-bonding layer includes polypropylene. The electrolytic solution includes a solvent and an electrolyte salt. The solvent includes a chain carboxylic acid ester. The thermal-fusion-bonding layer has a thickness of greater than or equal to 25 μm and less than or equal to 60 μm. The thermal-fusion-bonding part has a length of greater than or equal to 160 mm and less than or equal to 650 mm. The thermal-fusion-bonding part has a width of greater than or equal to 3 mm and less than or equal to 6 mm. A dimensional ratio defined by the thickness of the thermal-fusion-bonding layer, the length of the thermal-fusion-bonding part, and the width of the thermal-fusion-bonding part satisfies a condition represented by Expression (1). A drawn amount of the outer package members is less than or equal to 7.8 mm. A content of the chain carboxylic acid ester in the solvent is greater than or equal to 30 vol % and less than or equal to 60 vol %.

0.16≤(T×L)/W≤0.32   (1)

Where:
(T×L)/W is the dimensional ratio;
T is the thickness (cm) of the thermal-fusion-bonding layer;
L is the length (cm) of the thermal-fusion-bonding part; and
W is the width (cm) of the thermal-fusion-bonding part.

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.