Disclosed is a nonaqueous electrolyte battery using an aqueous sealant composition. The aqueous sealant composition comprises an aqueous dispersion in an amount of 70 mass % or more and 97 mass % or less by mass of solid content, wherein the aqueous dispersion comprises an olefinic polymer as a main component, and a water-soluble polymer in an amount of 3 mass % or more and 30 mass % or less by mass of solid content. The aqueous dispersion comprises an olefinic polymer as a main component. The olefinic polymer is a modified olefinic polymer. The modified olefinic polymer is a partial copolymer of a polymer selected from a group consisting of polyethylene, polypropylene, polybutene and ethylene-propylene polymers, and a polymerizable unsaturated organic acid selected from a group consisting of maleic anhydride, acrylic acid, methacrylic acid and esters thereof.

An electrode plate including an electrode plate body, a tab, a first adhesive layer, and a second adhesive layer. The tab includes a connecting portion connected to an extending portion. The connecting portion overlaps with and is connected to the electrode plate body. The extending portion protrudes from the connecting portion out of one side of the electrode plate body along a first direction. The first adhesive layer is disposed on the extending portion. The second adhesive layer includes a first part bonded to a surface of the electrode plate body and covering the connecting portion; and a second part formed by extending the first part from a side near the first adhesive layer along the first direction and bonded to the first adhesive layer. In a second direction perpendicular to the first direction, a width of the second part is less than a width of the first part.

An electrode plate including an electrode plate body, a tab, a first adhesive layer, and a second adhesive layer. The tab includes a connecting portion connected to an extending portion. The connecting portion overlaps with and is connected to the electrode plate body. The extending portion protrudes from the connecting portion out of one side of the electrode plate body along a first direction. The first adhesive layer is disposed on the extending portion. The second adhesive layer includes a first part bonded to a surface of the electrode plate body and covering the connecting portion; and a second part formed by extending the first part from a side near the first adhesive layer along the first direction and bonded to the first adhesive layer. In a second direction perpendicular to the first direction, a width of the second part is less than a width of the first part.

The present invention is provided with a secondary battery comprising: an electrode assembly to which an electrode lead is bonded; a pouch configured to accommodate the electrode assembly and provided with a sealing part; and a lead film configured to seal a portion between the sealing part and the electrode lead, wherein a pattern means configured to pattern the sealing part and the lead film so as to increase in bonding area between the sealing part and the lead film is provided on a bonding portion between the sealing part and the lead film. Therefore, bonding force and sealing force between the lead film and the sealing part may increase.

A secondary battery, including an electrode assembly and a housing accommodating the electrode assembly. The electrode assembly includes a first electrode plate, a second electrode plate, and a separator disposed there between. The first electrode plate and the second electrode plate are wound to form the electrode assembly. A tab is disposed in the first electrode plate and protrudes from the housing; and an adhesive layer is disposed in the tab. The adhesive layer includes a first portion sandwiched between a package area of the housing and a second portion extending from the first portion along a length direction of the tab. In a width direction of the tab, the first portion has a width greater than that of the second portion. In the length direction of the tab, the second portion protrudes into a space enclosed by an innermost layer of the separator.

A secondary battery, including an electrode assembly and a housing accommodating the electrode assembly. The electrode assembly includes a first electrode plate, a second electrode plate, and a separator disposed there between. The first electrode plate and the second electrode plate are wound to form the electrode assembly. A tab is disposed in the first electrode plate and protrudes from the housing; and an adhesive layer is disposed in the tab. The adhesive layer includes a first portion sandwiched between a package area of the housing and a second portion extending from the first portion along a length direction of the tab. In a width direction of the tab, the first portion has a width greater than that of the second portion. In the length direction of the tab, the second portion protrudes into a space enclosed by an innermost layer of the separator.

A battery pack having a population of secondary battery cells chargeable between a charged state and a discharged state, and a frame to hold secondary battery cells in the battery pack is provided, members of the population of secondary battery cells having an electrode assembly comprising a substantially polyhedral shape, and where the frame holds a cell array comprising a subset of the population of secondary batteries that are arranged adjacent to one another. A sealed secondary battery cell, electrode assembly, and methods of charging are also described.

A battery pack having a population of secondary battery cells chargeable between a charged state and a discharged state, and a frame to hold secondary battery cells in the battery pack is provided, members of the population of secondary battery cells having an electrode assembly comprising a substantially polyhedral shape, and where the frame holds a cell array comprising a subset of the population of secondary batteries that are arranged adjacent to one another. A sealed secondary battery cell, electrode assembly, and methods of charging are also described.

The herein-disclosed sealed battery includes a battery case, a terminal member (negative electrode external terminal) including an opposed surface opposed to the battery case, and an insulating member (negative side gasket) disposed between the sealing plate and the negative electrode external terminal. Then, the surface of the battery case and/or an opposed surface of the negative electrode external terminal includes a 1st rough surface area on at least a part of a portion contacting with the negative side gasket, and an arithmetic average roughness Sa of the 1st rough surface area is equal to or more than 1 μm. By doing this, it is possible to suppress a liquid leakage of an electrolyte caused by degradation of the negative side gasket.

A battery includes a packaging shell and a battery cell. The battery cell is disposed in the packaging shell, the battery cell includes a first electrode plate, the first electrode plate includes a first empty foil area and a second empty foil area where no active material is disposed on either side of the first electrode plate. The first empty foil area is arranged on a first surface, the second empty foil area is arranged on a second surface. At least one of the first surface and the second surface is adhered to the packaging shell by a bonding member. In a width direction of the battery cell, a width of the battery cell is W, a width of the first empty foil area is W1, a width of the second empty foil area is W2, and 0≤ (W1+W2)/W≤40%.