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: This application relates to a protection method for battery components that include an electrode assembly and a top cap assembly. The method includes: putting the battery components into a cavity, and vacuumizing the cavity to 100 kPa or below; introducing a first reactant into the cavity until a pressure rises by 1 Pa or above, and keeping the pressure for 1 ms or above; and optionally, vacuumizing the cavity to 100 kPa or below; and introducing a second reactant into the cavity until the pressure rises by 1 Pa or above, and keeping the pressure for 1 ms or above, so that protective layers are formed on surfaces of the battery components. This application further relates to a protection device for the battery components, a secondary battery, a battery module, a battery pack, and an electrical apparatus.

Abstract: This utility model relates to an electrode assembly, a battery cell, a battery, and an electric device. An electrode assembly includes an anode electrode plate and a cathode electrode plate. At least one side of the anode current collector is coated with an anode active substance layer. At least one side of the cathode current collector is coated with a cathode active substance layer and an additional layer. In a plane perpendicular to the stacking direction of the anode electrode plate and the cathode electrode plate, a projection of the anode active substance layer covers a projection of the cathode active substance layer and partially covers a projection of the additional layer. A battery includes the battery cells. An electric device includes the battery cells or the foregoing battery. The electrode assembly, battery cell, battery, and electric device can mitigate or reduce electrode plate cracking.

Abstract: The present disclosure relates to an electrode assembly, a forming method, a battery cell, a battery and an electrical apparatus. The electrode assembly includes an electrode body; a winding hole arranged to extend through the electrode body in a first direction; and a supporting capsule body provided within the winding hole, configured to support the winding hole, and including a flexible wall and an accommodating cavity surrounded and formed by the flexible wall, wherein at least part of the accommodating cavity is filled with fillers for supporting the accommodating cavity. The winding hole of the electrode assembly provided according to embodiments of the present disclosure is not prone to collapse, improving an operating stability and safety performance of the electrode assembly.

Abstract: This application discloses a heat-resistant protective member and a battery. The heat-resistant protective member includes a reinforcing layer, a functional layer, and a strengthening layer that are sequentially arranged; the functional layer includes a first resin and a filler dispersed in the first resin; and the reinforcing layer and the strengthening layer each include a fiber matrix. In the foregoing manner, thermal impact of a single battery during ignition and detonation can be resisted, and structural integrity under the thermal impact can still be prevented from being broken through, so as to provide effective heat insulation and protection for a battery pack.

Abstract: An electrode assembly, a battery cell, a battery, and an electrical device are provided. The electrode assembly includes a first electrode plate and a second electrode plate laminated in a first direction, with opposite polarities. The first electrode plate includes a first current collector and a first active material layer disposed on at least one side of the first current collector in the first direction. One end of the first current collector is provided with a first tab in a second direction. The first electrode plate further includes a first insulating layer disposed at an edge of at least one side of the first active material layer in a third direction. The first insulating layer and the first active material layer are disposed on the same side of the first current collector. Any two of the first direction, the second direction, and the third direction are perpendicular to each other.

Abstract: A battery cell includes a housing, at least one electrode assembly and a support member. The housing has a wall part. The electrode assembly has a main body and at least one tab. In the first direction, the tab protrudes from an end of the main body facing the wall part. The tab includes a root part and a tab part, and the root part connects the main body and the tab part. The support member is provided at one side of the main body facing the wall part. The support member includes at least one wing part, and the tab part is bent around the wing part. The wing part is provided with an accommodation part, and the accommodation part is used to accommodate a portion of the root part.

Abstract: This application provides a secondary battery and an electrical device. The secondary battery includes a current collector and a negative film layer. The negative film layer includes: a first film layer, disposed on at least one surface of the current collector, where the first film layer includes a first negative active material; a second film layer, disposed on a surface of the first film layer, where the surface is away from the current collector, and the second film layer includes a second negative active material. A volume distribution diameter Dv50 of the first negative active material is greater than a volume distribution diameter Dv50 of the second negative active material, and a powder compaction density of the first negative active material is greater than the powder compaction density of the second negative active material under a same pressure.

Abstract: A battery and an electric device are provided. The battery includes a battery module and a pressure applying component. The battery module includes one layer of battery row or a plurality of layers of battery rows laminate in a first direction. The battery row includes one battery cell or a plurality of battery cells arranged in a second direction, and a first surface, perpendicular to the first direction, of a housing of the battery cell is a surface having the largest area. The pressure applying component is provided on at least one side of the battery module in the first direction, the pressure applying component abuts against the first surface, and a position of the pressure applying component in the first direction is adjustable.

Abstract: Examples of a battery and an electric device of the battery are disclosed. An example battery includes: a plurality of battery rows arranged in a first direction, in which the battery row includes a plurality of battery cells arranged in a second direction perpendicular to the first direction; and a reinforcing structure including at least one first reinforcing structure and a second reinforcing structure connected to each other, in which the at least one first reinforcing structure and the plurality of battery rows are stacked in the first direction, and the second reinforcing structure and the plurality of battery cells in one battery row are stacked in the second direction.

Abstract: Provided are battery cell, battery, and electrical device. The battery cell includes box body, end cover, electrode assembly, and first current collecting member and second current collecting member arranged separately, wherein the housing is provided with opening; the end covers on the opening; the electrode assembly is accommodated in the housing; the electrode assembly is provided with electrode lug; the first current collecting member is connected to the electrode lug; and the second current collecting member is connected to the end cover, wherein along thickness direction of the end cover, the first current collecting member and the second current collecting member are stacked and connected to each other; the second current collecting member is located on one side of the first current collecting member facing the end cover; and projection of the second current collecting member is located within outer edge of the first current collecting member.

Abstract: A battery and an electric device are provided. The battery includes a plurality of battery cells, and the plurality of battery cells includes at least one first battery cell and at least one second battery cell. A length of the at least one first battery cell is greater than a length of the at least one second battery cell, and the at least one first battery cell is adjacent to and connected to the at least one second battery cell.

Abstract: A heat-resistant protective member and a battery are disclosed. The heat-resistant protective member includes a compound layer, and the compound layer includes a fiber matrix and a resin. The resin is dispersed in pores of the fiber matrix and/or a surface of the fiber matrix, and a volume proportion of the fiber matrix in the compound layer is 50% to 75%. In this way, the thermal shock when a battery cell is ignited and exploded can be resisted, and the structural integrity can still be maintained without being broken through under the thermal shock, thereby providing effective heat insulation and protection for a battery pack.

Abstract: Some embodiments of the present application provide an electrode plate, an electrode assembly, a battery cell, a battery, and an electrical apparatus. The electrode plate includes a current collector and an active material layer coated on the surface of the current collector. The current collector includes a coating region coated with the active material layer and a tab region not coated with the active material layer. The tab region is provided with a stress barrier structure spaced apart from the coating region. The stress barrier structure is configured to reduce the stress transmitted to the junction of the tab region and the coating region when the tab region is deformed.

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: An electrode plate includes: a current collector having a plurality of first surfaces; and an active substance layer provided on at least one of the plurality of first surfaces and having a second surface on a side away from the current collector; where the second surface is provided with at least one concave portion that is recessed relative to the second surface, a volume sum of cavity(s) formed by the at least one concave portion is a first volume V1, a material volume of the active substance layer is a second volume V2, and the first volume V1 and the second volume V2 satisfy: V ? 1 : ( V ? 1 + V ? 2 ) = 0.1 % ? to ? 30 ? % .

Abstract: A protection method for a secondary battery includes evacuating the secondary battery through an injection opening of the secondary battery to within 100 kPa, introducing a first reactant into the secondary battery through the injection opening until a pressure of the secondary battery rises by more than 1 Pa and maintaining the pressure for more than 1 ms, evacuating the secondary battery through the injection opening to within 100 kPa, and introducing a second reactant into the secondary battery through the injection opening until the pressure rises by more than 1 Pa and maintaining the pressure for more than 1 ms, thereby forming a protection layer on an internal surface of the secondary battery.

Abstract: This application provides a battery cell, a battery, and an electric device. The battery cell includes: an electrode assembly; a housing, where the housing has a first opening for accommodating the electrode assembly; an end cover configured to cover the first opening, where the end cover has a protruding structure, the protruding structure protrudes along a first direction away from the interior of the battery cell, and the first direction is a thickness direction of the end cover; and an electrode terminal, where the electrode terminal has a protruding portion protruding from the protruding structure along a second direction, and the second direction is perpendicular to the first direction. The battery cells are interconnected in the second direction through the protruding portions of the electrode terminals, which can enhance the strength of the connection between the battery cells.

Abstract: The present application relates to a cylindrical cell, a battery, and a power consuming device, and belongs to the field of battery manufacturing technology. The present application provides a cylindrical cell, comprising: a housing, the housing having an opening at an end in a first direction; and an end cap, covering the opening; wherein the housing comprises a side wall, the side wall comprises a first wall portion and a second wall portion disposed in the first direction, the second wall portion is located on a side of the first wall portion close to the opening, the second wall portion has a thickness greater than the thickness of the first wall portion, and the second wall portion is welded to the end cap.

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.