Disclosed is a cleavage flaking type lithium ion battery and a preparation method thereof. The cleavage flaking type lithium ion battery includes a battery shell and a winding electric core; the winding electric core includes a battery pole piece which includes a coating region and a blank region adjacent to the coating region coated with an electrode material, and the blank region is directly connected with the battery shell or with a metal contact on the battery shell. The battery pole piece is directly connected with the battery shell, which omits the traditional process in which pole pieces need to be overlaid and welded with tabs, thereby effectively simplifying the process flow, improving the automation degree of production, avoiding a risk of short-circuit firing caused by a fact that a diaphragm is punctured when the tabs are wrapped in the pole pieces and improving the safety performance of the battery.

An electrode assembly, in which a positive electrode, a separator, and a negative electrode are alternately stacked to be wound, wherein the positive electrode comprises a positive electrode collector, a positive electrode active material portion that is an area, on which a positive electrode active material is stacked on the positive electrode collector, and a positive electrode non-coating portion that is an area, on which the positive electrode active material is not stacked on the positive electrode collector, the positive electrode non-coating portion comprises a first positive electrode non-coating portion disposed at a winding central portion of the electrode assembly is provided. The electrode assembly further includes a heat-dissipating tape disposed on the first positive electrode non-coating portion and includes a heat-dissipating material. A secondary battery having the electrode assembly is also provided.

A swelling tape including a base layer and an adhesive swelling is provided. The adhesive swelling layer contains a water-based self-healing binder. An electrode assembly in which the swelling tape is attached to an outer circumferential surface thereof, and a secondary battery including the electrode assembly are also provided.

An all solid storage element laminate that has a plurality of all solid storage elements disposed in a matrix, and includes a plurality of element layers laminated in a thickness direction. The all solid storage elements of element layers adjacent to each other in a thickness direction are electrically connected to each other.

The present invention relates to an electrode assembly and a secondary battery comprising same, the electrode assembly comprising a cathode plate having a leading side formed to be slanted, so that stress exerted by distortion occurring at a center winding portion during charging and discharging of a secondary battery can be distributed, thus preventing the cathode plate from penetrating a separator at the distorted site causing a short with an anode plate. According to an embodiment, the present invention relates to an electrode assembly comprising: an anode plate having an anode coating layer formed on an anode current collector plate; a cathode plate having a cathode coating layer formed on a cathode current collector plate; and a separator interposed between the cathode plate and the anode plate, the electrode assembly being formed by winding a stack of the anode plate, the separator, and the cathode plate, and disclosed are an electrode assembly and a secondary battery comprising same, the electrode assembly comprising a cathode plate having: a side extending along the lengthwise direction; a side opposite to the side, extending along the lengthwise direction; and a leading side connecting the side and the opposite side and located at a center winding portion of the wound electrode assembly, the leading side being slanted to have an acute angle or obtuse angle with respect to the side; and a terminating side connecting the side and the opposite side and located, as a side opposite to the leading side, on the outermost side of the electrode assembly.

A secondary battery according to one embodiment of the present disclosure includes: a jelly-roll type electrode assembly; a top insulator located at the top of the electrode assembly; and a bottom insulator located at the bottom of the electrode assembly, wherein at least one of the top insulator and the bottom insulator includes a temperature-sensitive polymer that swells in accordance with a temperature rise.

A rechargeable battery is produced by welding a metal foil to a contact element to make electrical contact with an electrode of the rechargeable battery. An edge region of the metal foil is brought into contact with a first surface of the contact element and welded to the contact element by applying a laser beam to a second surface of the contact element. The second surface being averted from (opposite to) the first surface of the contact element. The metal foil and further planar constituents of the rechargeable battery are wound to provide the rechargeable battery with an at least essentially cylindrical design. The contact element-is oriented at right angles to the metal foil.

Various embodiments of the present invention relate to a secondary battery, wherein a technical problem to be solved is to provide a secondary battery capable of maintaining an electrical insulating state between a case (can) and a cap assembly even after a gasket is melted due to short-circuiting and heat generation. To this end, the present invention provides a secondary battery comprising: a cylindrical can; an electrode assembly received, along with an electrolyte, in the cylindrical can; a cap assembly for sealing the cylindrical can; and a gasket interposed between the cylindrical can and the cap assembly, wherein the gasket further includes an insulating member having a melting temperature higher than a melting temperature of the gasket.

A cylindrical secondary battery includes a bottomed cylindrical battery case having an opening, an electrode group, an electrolyte solution, and a sealing member blocking the opening of the battery case. The electrode group includes a positive electrode, a negative electrode, and a separator. The negative electrode includes a negative electrode current collector and a negative electrode mix layer placed on at least one principal surface of the negative electrode current collector. The negative electrode mix layer includes a non-facing region not facing the positive electrode mix layer. The density of the negative electrode mix layer is 1.25 g/cm.sup.3 to 1.43 g/cm.sup.3, the ratio of the entire length of the non-facing region to the entire length of the negative electrode mix layer is 0.09 or more, and the inside diameter of a hollow section of the electrode group is 2.0 mm or less.

An insulating plate for a secondary battery includes a wound electrode group, an electrolyte, a cylindrical battery case that houses the electrode group and the electrolyte, and a sealing body that seals an opening of the battery case and includes a discharge valve. The insulating plate is disposed between the electrode group and the sealing body and has a disk shape with a thickness T of 0.1 mm or more. The insulating plate has a first hole formed centrally therein and at least one second hole formed around the first hole so as to extend along the outer periphery of the disk shape. The ratio (=T/D) of the thickness T to a diameter D of the insulating plate is 0.016 or less, and the insulating plate has an opening ratio of 36% or less.