Abstract: A secondary battery includes an electrode assembly including a main body and a tab extending from the main body, wherein the main body includes a negative electrode plate including a negative current collector, and a negative electrode film layer arranged on at least one surface of the negative current collector, wherein the negative electrode film layer includes a first region and a second region arranged to at least one side of the first region, in the direction that the tab extends, wherein the first region includes a first negative electrode active material and the second region includes a second negative electrode active material, and wherein the first negative electrode active material has a powder OI value denoted as OIa, and the second negative electrode active material has a powder OI value denoted as OIb, wherein the negative electrode film layer satisfies OIa<OIb.

Abstract: A battery cell includes: an end cover assembly, including an end cover, and an electrode terminal and a pressure relief mechanism disposed at the end cover; and an adapter, disposed at a side of the end cover facing the interior of the battery cell. The adapter includes first, second, and third connection portions that are sequentially folded along a thickness direction of the end cover. The first connection portion is configured to be connected to an electrode assembly, the third connection portion is configured to be connected to the electrode terminal, and the second connection portion is connected to the first connection portion and the third connection portion. The second connection portion is provided with a first through hole, and the first through hole is used for allowing gas inside the battery cell to pass through, so that the gas can flow to the pressure relief mechanism.

Abstract: A battery cell, a battery and an electric device are provided. The battery cell includes a casing, which is provided with an opening; an electrode assembly, which is accommodated inside the casing; and a cover body, which closes the opening and forms a sealing structure with the casing. One of the casing and the cover body is provided with a first flange portion; the first flange portion is connected to the other one of the casing and the cover body by means of a connection portion; the connection portion includes a first region and a second region; and the strength of the second region is lower than the strength of the first region.

Abstract: An end cover assembly includes an end cover and a current collecting member, and the end cover is provided with a pressure relief structure. The current collecting member is located on one side of the end cover facing the interior of the battery cell and including a current collecting portion and an assembling portion. The assembling portion is located between the end cover and the current collecting portion and is configured to be connected to the end cover and the current collecting portion. The current collecting portion is provided with a pressure relief hole for allowing fluid to pass. First supporting members and a second supporting member are separately arranged on two side surfaces, facing each other, of the end cover and the current collecting portion. Projections of the first supporting members and a projection of the second supporting member are intersected in a thickness direction of the end cover.

Abstract: A battery top cover assembly includes a cover; a connecting member; and an insulating member connected between the cover and the connecting member. The insulating member has a first outer surface exposed outside the cover and the connecting member; and a first seam is present between the first outer surface and the cover, and a second seam is present between the first outer surface and the connecting member. A first sealing portion is disposed at the first seam and configured to cover the first seam, and/or a second sealing portion is disposed at the second seam and configured to cover the second seam.

Abstract: The present application relates to a negative electrode material for a secondary battery. The negative electrode material includes an expanded graphite and an organic phase change material intercalated into the expanded graphite. The present application further relates to a method for preparing the negative electrode material and a secondary battery using the negative electrode material. Since the organic phase change material is intercalated into the expanded graphite, when an internal temperature of the secondary battery increases, the organic phase change material absorbs heat by phase change, which can improve the heat storage and energy storage capacity and the safety performance of the secondary battery. In addition, since the organic phase change material has certain viscosity and flexibility, the adhesion performance of the negative electrode material on the current collector can also be improved.

Abstract: Provided is a negative electrode plate. A negative electrode plate includes a negative current collector and a first coating layer arranged on a surface of the negative current collector. The negative electrode plate further includes a second coating layer arranged on a surface of the first coating layer. The first coating layer contains a negative electrode active material. The second coating layer contains a heat-resistant insulating material. The heat-resistant insulating material is selected from an oxide or a hydroxide containing at least one of elements selected from a group consisting of Mg, Si, Zr and Y. In the present application, the second coating layer containing the heat-resistant insulating material is coated on a surface of the conventional negative electrode active material layer, so an instantaneous high power discharge in a short circuit of the secondary battery can be avoided, and a safety performance of the battery can be improved.

Abstract: The present application relates to a negative electrode material for a secondary battery. The negative electrode material includes an expanded graphite and an organic phase change material intercalated into the expanded graphite. The present application further relates to a method for preparing the negative electrode material and a secondary battery using the negative electrode material. Since the organic phase change material is intercalated into the expanded graphite, when an internal temperature of the secondary battery increases, the organic phase change material absorbs heat by phase change, which can improve the heat storage and energy storage capacity and the safety performance of the secondary battery. In addition, since the organic phase change material has certain viscosity and flexibility, the adhesion performance of the negative electrode material on the current collector can also be improved.