Abstract: A battery cell includes a housing, an electric terminal disposed on the housing, and an electrode assembly accommodated in the housing. The electrode assembly includes a main body portion and a tab extending out of an end face of the main body portion and including a first connecting portion configured to be connected to the electrode terminal and a second connecting portion configured to be connected to the main body portion. Along a length direction of the end face, at least part of the first connecting portion exceeds the second connecting portion. As the first connecting portion exceeds the second connecting portion in the length direction of the end face, the connectable range of the first connecting portion in the length direction of the end face can be expanded, facilitating direct connection of the first connecting portion with the electrode terminal.

Abstract: In some embodiments, the battery cell includes a shell, including an opening; an electrode unit, accommodated in the shell, the electrode unit including a main body portion and a tab portion protruding from the main body portion; a cap assembly, for connecting with the shell, and covering and closing the opening; and a first insulating member, accommodated in the shell and adapted to isolate at least part of the main body portion from the shell, the first insulating member including a first insulating plate, and the first insulating plate being disposed on a side of the main body portion facing the cap assembly and being attached to the main body portion. The first insulating member can insulate at least part of the main body portion from the shell.

Abstract: A secondary battery, comprising a positive electrode plate, a negative electrode plate and a separator provided between the positive electrode plate and the negative electrode plate; wherein the negative electrode plate comprises a negative electrode current collector and a negative electrode active material layer provided on at least one surface of the negative electrode current collector, the negative electrode plate comprises one or more planar areas and one or more curved areas, the negative electrode active material layer of at least one of the planar areas comprises an active material A, and the negative electrode active material layer of at least one of the curved areas comprises an active material B, and the expansion rate of the active material B is greater than that of the active material A.

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: An embodiment of the present application provides an electrode assembly, a battery cell, a battery, and an electrode assembly manufacturing method and device, which belong to the technical field of batteries. The electrode assembly includes a positive electrode plate and a negative electrode plate, the positive electrode plate and the negative electrode plate being wound in a winding direction and forming a winding structure. The positive electrode plate comprises a plurality of first active substance layer regions and at least one first inactive substance layer region; and in an axial direction of the winding structure, the first inactive substance layer region is located between two adjacent first active substance layer regions, wherein, the first inactive substance layer region is provided with a first guide flow through hole, and the first guide flow through hole is configured to penetrate both sides in a thickness direction of the positive electrode plate.

Abstract: A battery cell may comprise: an electrode assembly, a housing and an end cap. The electrode assembly may have a first tab. The housing may have an opening for accommodating the electrode assembly. The end cap may be configured to connect with the housing and cover the opening. The end cap may have an abutting surface and a welding groove, the abutting surface may be configured to abut against the first tab, and the welding groove may be recessed from one side of the end cap away from the electrode assembly towards the abutting surface. The end cap may form a connector between the abutting surface and the bottom surface of the welding groove, and the connector is configured for being welded with the first tab. The end cap is provided with a reinforcing structure, and the reinforcing structure is protruded from the bottom surface.

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 application provides an electrode assembly and a preparation method therefor, a secondary battery, and a power consuming device. A reserved space is formed between at least one surface of a separator and a corresponding electrode plate, and a spacing D of the reserved space tends to increase in a preset direction of the electrode plate from either edge of the separator to a middle of the separator, so that the reserved space is of a structure with a large middle and two small ends. In this way, during cycle of charging and discharging, when the electrode plate expands at a middle part more than at two edges thereof in its own width direction, the electrode plate is better accommodated in the reserved space.

Abstract: A negative electrode active material comprises a carbon-based material and a silicon-based material, wherein a first functional group exists on the surface of the carbon-based material, a second functional group exists on the surface of the silicon-based material, and the first functional group has a charge opposite to that of the second functional group.

Abstract: The present application provides a battery cell, a preparation method therefor, a secondary battery, and a power consuming device. The battery cell is formed by winding a negative electrode plate, a positive electrode plate, and a separator positioned between the negative electrode plate and the positive electrode plate, wherein the negative electrode plate has a negative electrode curved surface area, and the positive electrode plate has a positive electrode curved surface area; and at least one curved surface area group composed of the negative electrode curved surface area and the positive electrode curved surface area positioned outside and adjacent to the negative electrode curved surface area is included at a corner of the battery cell.

Abstract: The present application relates to a battery cell and a manufacturing method and device thereof, a battery, and a power consumption apparatus, belonging to the field of battery manufacturing technologies. The battery cell includes: a shell with a first wall; an electrode assembly; and a first current collecting member, where the first wall has a first surface facing the first current collecting member, the first current collecting member has a second surface facing the first wall, one of the first surface and the second surface is provided with a protrusion and the other abuts against the protrusion to form a gap between the first wall and the first current collecting member; and the first current collecting member is provided with a first hole and a second hole, and the first hole is configured to be in communication with the second hole through the gap.

Abstract: The present application relates to a battery module, including a first-type battery cell and a second-type battery cell electrically connected at least in series, the first-type battery cell and the second-type battery cell are battery cells of different chemical systems, the first-type battery cell includes N first battery cell(s), the second-type battery cell includes M second battery cell(s); the first battery cell includes a first negative electrode plate, the second battery cell includes a second negative electrode plate, a ratio of a conductivity of an electrolyte solution (25° C.) of the first battery cell to a coating mass per unit area of the first negative electrode plate is denoted as M1, and a ratio of a conductivity of an electrolyte solution (25° C.) of the second battery cell to a coating mass per unit area of the second negative electrode plate is denoted as M2, M1>M2, and 0.08?M1?11, 0.03?M2?4.62.

Abstract: Provided are a battery cell, a battery and an electricity consumption device. The battery cell includes: an electrode assembly which includes a body portion and a tab extending from the body portion; a housing configured to accommodate the electrode assembly and provided with a first opening; a first end cover configured to cover the first opening; and a tab support located between the first end cover and the body portion and configured to support the tab, wherein the first end cover is provided with a first clamping structure, the tab support is provided with a second clamping structure, and the first clamping structure is clamped with the second clamping structure. By means of the technical solutions in the embodiments of the present application, the reliability of the battery cell can be improved.

Abstract: This application provides an exhaust device, a battery cell, a battery, and an electricity-consuming device. The exhaust device includes an exhaust body, a first venting member, and a second venting member; the first venting member is disposed on the exhaust body; the second venting member is disposed on the exhaust body and is disposed on a side of the first venting member in a thickness direction of the exhaust body, and the first venting member and the second venting member are configured to allow gas to pass through when gas pressure in the battery cell reaches a first threshold. The exhaust device provided by this application facilitates reducing the risk of electrolyte solution leakage inside the battery cell and ensuring normal pressure relief operation of the battery cell, thus further improving the safety performance of the battery cell.

Abstract: A battery cell, a battery and an electric device are disclosed. The battery cell includes a housing, an electrode assembly, a detection assembly and a protective assembly. The housing includes an accommodation cavity. The electrode assembly is accommodated in the accommodation cavity. The detection assembly is connected to the housing and is used to detect an operation state of the battery cell. The protective assembly protrudes from the housing and is arranged on a same side as the detection assembly so as to protect the detection assembly. The embodiments of the application can effectively improve safety and reliability of the battery cell.

Abstract: The present disclosure provides a battery cell, a battery and an electrical apparatus. The battery cell includes a housing comprising a first wall with a through hole; electrode terminal provided on the first wall, each electrode terminal having an end face facing the first wall, and at least a portion of the end face being opposite to the through hole; and a sealing element at least partially surrounding a peripheral side of the through hole, and at least a portion of the sealing element being connected between the end face and the first wall. The sealing element is provided with one of a boss and a groove, at least one of the electrode terminal or the first wall is provided with the other of the boss and the groove, and the boss is fitted with the groove.

Abstract: Embodiments of this application provide a battery cell, a battery, and an electrical device. The battery cell includes: a shell, having a first wall; a pressure relief mechanism, disposed at the first wall; an electrode lead-out portion, disposed on the shell; an electrode assembly, disposed in the shell, the electrode assembly including a tab; an adapter member, connecting the electrode lead-out portion to the tab; and a gap control portion, disposed in the shell, the gap control portion being configured to be able to restrict the adapter member from shielding a pressure relief hole formed by the pressure relief mechanism in the event of thermal runaway of the battery cell.

Abstract: This application relates to a battery and an electric apparatus. A ratio of a capacity per unit area of a negative electrode of the battery to a capacity per unit area of a positive electrode of the battery is referred to as an NP ratio. The NP ratio of the battery is greater than or equal to 1.105, allowing the negative electrode potential corresponding to an upper limit of SOC of the battery to be higher than potential for crystalline phase formation, without BMS control or forced charging/discharging. This can alleviate or avoid battery memory effects, enabling maximum utilization of the capacity of the battery and improving energy efficiency of the battery.

Abstract: A sodium-ion battery includes a positive electrode plate, a negative electrode plate, and an ion conductor. The ion conductor is located between the positive electrode plate and the negative electrode plate. The ion conductor is at least in contact with a surface of the negative electrode plate, the ion conductor is configured to conduct sodium ions between the positive electrode plate and the negative electrode plate, and sodium ions conducted to the surface of the negative electrode plate are reduced to sodium metal, where an elastic modulus of the ion conductor is E in GPa, where 0.1?E?5.0.