The invention provides a polyphenylene sulfide film formed of a polyphenylene sulfide resin composition and comprising at least one layer, wherein the (a) polyphenylene sulfide film has a thickness of 0.2-30 μm, (b) the polyphenylene sulfide film has a tensile elongation at break of 30%-150% in each of an MD direction and a TD direction, (c) a relationship between the tensile elongation at break in the MD direction (SMD) and the tensile elongation at break in the TD direction (STD) satisfies the formula 0.75≤SMD/STD≤1.25, and (d) the polyphenylene sulfide film has a heat shrinkage rate at 180° C. for 30 minutes of 4% or less in both the MD direction and the TD direction.

A battery cell (1) has an electrode composition, a frame member (3) placed annularly so as to surround the electrode composition, and a positive electrode current collector and a negative electrode current collector for closing openings of the frame member (3) from both sides in the thickness direction. The frame member (3) has a fragile portion (9) for communicating inside and outside of the frame member (3) when the pressure inside the frame member increases above a certain level. The battery cell (1) in question allows increase in the pressure inside the frame member (3), thereby preventing damage.

An electrode for a non-aqueous electrolyte rechargeable battery includes a current collector, an electrode mixed material layer, and a conductive base layer between the current collector and the electrode mixed material layer, wherein the base layer includes at least a styrene-acrylic acid ester-based copolymer, a carbon material, and polyacrylic acid, in the base layer, a content of the styrene-acrylic acid ester-based copolymer is greater than or equal to about 45 wt % and less than or equal to about 77.5 wt %, in the polyacrylic acid, a carboxy group is not neutralized or a ratio of a neutralized carboxy group neutralized by alkali metal ions among the carboxy groups is less than or equal to about 25%, and a loading amount of the electrode mixed material layer per one surface of the current collector is greater than or equal to about 15 mg/cm.sup.2 and less than or equal to about 70 mg/cm.sup.2.

This application relates to an electrode plate that includes a current collector and an electrode active material layer disposed on at least one surface of the current collector. The current collector includes a support layer and a conductive layer disposed on at least one surface of the support layer. A single-side thickness D2 of the conductive layer satisfies 30 nm≤D2≤3 μm. The electrode active material layer includes an electrode active material, a binder, and a conductive agent unevenly distributed in a thickness direction of the electrode active material layer. A weight percentage of the conductive agent in an interior area of the electrode active material layer is higher than that in an exterior area of the electrode active material layer.

A battery cell includes a current collector, separator, anode, and deposition biasing element. The anode is positioned between the current collector and separator, and includes an ion conducting ceramic material with a porous structure. The biasing element is positioned within the battery cell so as to bias ion deposition within the anode, during a charging process, away from the separator. A method for forming a battery cell includes electrospinning particles of material into a mesh to form an anode that includes an ionically conductive material. At least one biasing element is applied to at least one of the anode and a current collector. The anode is positioned between the current collector and a separator. The current collector and the separator are joined to the anode.

The present invention relates to a positive electrode plate and an electrochemical device. The positive electrode plate comprises a current collector, a positive active material layer and a safety coating disposed between the current collector and the positive active material layer, wherein the safety coating comprises a polymer matrix, a conductive material and an inorganic filler, wherein the polymer matrix comprises at least two types of polymer materials, and the first type of polymer material is fluorinated polyolefin and/or chlorinated polyolefin, and the solubility of the second type of polymer material in oil solvent is smaller than the solubility of the first type of polymer material; and the weight percentage of the first type of polymer material relative to the total weight of the polymer matrix, the conductive material and the inorganic filler is 17.5% or more. The positive electrode plate improves high temperature safety of electrochemical device.

The electrode plate according to the present application includes a current collector and an electrode active material layer disposed on at least one surface of the current collector, wherein the current collector includes a support layer and a conductive layer disposed on at least one surface of the support layer, the conductive layer has a single-sided thickness D2 satisfying: 30 nmD23 μm; and a conductive primer layer containing a first conductive material and a binder is provided between the current collector and the electrode active material layer, and the first conductive material in the conductive primer layer comprises at least one of a one-dimensional conductive material and a two-dimensional conductive material. The electrode plate of the present application has good workability, and the electrochemical device including the electrode plate has high energy density, good electrical performance and long-term reliability.

A non-aqueous electrolyte secondary battery includes an electrode current collector, an intermediate layer, and an electrode active material layer. The intermediate layer is interposed between the electrode current collector and the electrode active material layer. The intermediate layer contains a metal-covered microcapsule. The metal-covered microcapsule includes a microcapsule and a metal film. The microcapsule includes a core and a shell. The shell surrounds the core. The core includes a volatile material. The shell includes a thermoplastic resin material. The metal film covers at least part of an outer surface of the microcapsule.

A battery manufacturing method includes forming a unit cell having a positive electrode that is obtained by a positive electrode active material layer containing an electrolytic solution being disposed on a positive electrode current collector, a negative electrode that is obtained by a negative electrode active material layer containing an electrolytic solution being disposed on a negative electrode current collector, and a separator interposed between the positive and negative electrodes. Heat sealing a seal part that is disposed at an outer peripheral portion of the unit cell. Cooling the outer peripheral portion of the unit cell by using a cooling medium after carrying out the heat sealing of the seal part. The method is performed such that the positive electrode and the negative electrode are formed without an application film being subjected to a drying process performed through heating.

A positive electrode current collector, a positive electrode piece, an electrochemical device and an apparatus, where the positive electrode current collector includes a support layer and a conductive layer provided on the support layer, where a material of the conductive layer is aluminum or aluminum alloy, and a thickness D.sub.1 of the conductive layer is 300 nm≤D.sub.1≤2 μm; an elongation at break B of the support layer is 10,000%≥B≥12%, and a volume resistivity of the support layer is greater than or equal to 1.0×10.sup.−5 Ω.Math.m; when a tensile strain of the positive electrode current collector is 2%, a square resistance growth rate T.sub.1 of the conductive layer is T.sub.1≤10%. The positive electrode current collector provided in the present application can simultaneously take into account both high safety performance and electrical performance.