Abstract: A battery cell includes an electrode assembly and an electrolyte solution. The electrode assembly includes a positive electrode sheet, a negative electrode sheet, and a separator. The electrolyte solution includes an organic solvent and an electrolyte salt dissolved in the organic solvent. The electrolyte salt includes a lithium salt and another alkali metal salt different from the lithium salt. A value of the compacted density of the positive electrode sheet is in a range of 2.8 g/cm3 to 4.0 g/cm3. The radii of alkali metal ions in the another alkali metal salt are greater than those of lithium ions, and the alkali metal ions can be intercalated into some lithium sites of a positive electrode in a first discharging process, to improve structural stability, and increase components of organic lithium in an SEI in a formation process of an SEI film during first charging and discharging.

Abstract: A battery cell, a battery, and an electrical apparatus. The battery cell includes a shell, an electrode assembly, an electrode column, a current collector component, and a mounting rack. The shell has a first wall. The electrode assembly is accommodated inside the shell, and includes a main body part and a tab. Along the thickness direction of the first wall, the tab is set at one end of the main body part facing the first wall. The electrode column is installed on the first wall. The current collector component connects the electrode column and the tab. Along the thickness direction of the first wall, the mounting rack is set between the first wall and the main body part, and the current collector component is connected to the mounting rack.

Abstract: An electrode plate includes a current collector and an active substance layer disposed on at least one surface of the current collector. The active substance layer includes an active substance and a polymer, and the active substance layer satisfies Formulas (1) to (3). ? = 1 - P 1 P 2 Formula ? ( 1 ) v = ? × ( d 2 ) 2 × h × ? t Formula ? ( 2 ) v / ? > 1.

Abstract: This application provides a battery cell, a battery, and an electric apparatus. The battery cell includes an electrode assembly, a housing, and a current collecting member. The electrode assembly includes a first tab; the housing is configured to accommodate the electrode assembly; and the current collecting member is accommodated in the housing, the current collecting member is electrically connected to the first tab, and the current collecting member is connected to the housing by welding.

Abstract: A battery cell comprises: a shell assembly comprising electrode lead-out parts used to input or output electric energy, an electrode assembly accommodated in the shell assembly and comprising a cylindrical main body part and tab parts protruding from an end of the main body part and comprising a plurality of sub-tabs, and current collecting members accommodated in the shell assembly and each comprising a plurality of converging portions sequentially arranged at intervals along the circumferential direction of the current collecting member and conducting portions positioned between every two adjacent converging portions. The converging portions extend along the radial direction of the current collecting member. The conducting portion is connected to its adjacent two converging portions. The converging portions are used to be electrically connected to the electrode lead-out part. The conducting portions are used to be electrically connected to at least one of the sub-tabs.

Abstract: The present application relates to a separator, comprising a substrate and a coating formed on at least one surface of the substrate, wherein the coating comprises inorganic particles and first organic particles embedded in the inorganic particles and forming protrusions on the surface of the coating, and the first organic particles have a primary particle morphology and a number-average particle size of ?2 ?m. The present application also relates to a secondary battery comprising the separator, a device comprising the secondary battery and a method for preparing the separator.

Abstract: The present application relates to a separator, comprising a substrate and a coating formed on at least one surface of the substrate; wherein the coating comprises inorganic particles and organic particles, the organic particles comprise first organic particles and second organic particles; the first organic particles and the second organic particles are embedded in the inorganic particles and form protrusions on the surface of the coating; the first organic particles have a number-average particle size of >10 ?m, and the second organic particles have a number-average particle size of 2 ?m-10 ?m. The present application also relates to a secondary battery comprising the separator, a device comprising the secondary battery and a method for preparing the separator.

Abstract: A battery cell, a battery, and an electric apparatus are disclosed. The battery cell includes a housing and an electrode assembly, the electrode assembly being disposed in the housing, where a buffer member is further disposed in the housing, and the buffer member is configured to be deformable when the electrode assembly deforms.

Abstract: A battery cell includes a shell and at least one electrode assembly accommodated in the shell. The shell includes a first plate and a second plate, the second plate is intersected with the first plate for arrangement, the first plate includes a first inner wall surface facing the electrode assembly, and the second plate includes a second inner wall surface facing the electrode assembly. The shell includes a third inner wall surface connecting the first inner wall surface and the second inner wall surface, at least a part of the third inner wall surface defines a first avoidance groove, in a thickness direction of the first plate, the first avoidance groove is concave relative to the first inner wall surface and towards one side away from the electrode assembly, and a part of a projection of the electrode assembly on the first plate overlaps the first avoidance groove.

Abstract: A battery cell, a battery, and an electrical device are disclosed. The battery cell includes: a shell, an electrode assembly, an electrode terminal, and a current collecting component. The shell is configured to accommodate the electrode assembly. The electrode assembly includes a tab. The electrode terminal is disposed on the shell. The current collecting component includes a tab connecting portion and a terminal connecting portion. The tab connecting portion is configured to be connected to the tab. The terminal connecting portion is configured to be connected to the electrode terminal. The terminal connecting portion includes a plurality of terminal connecting sub-portions stacked in layers. Each terminal connecting sub-portion includes a riveting sub-portion. Any two adjacent riveting sub-portions are fixed together by riveting.

Abstract: This application relates to a battery cell, a battery, and an electric device. The battery cell includes an end cover assembly, a tab bracket, a fixing member, a housing, and an electrode assembly. The housing has an opening. The end cover assembly closes the opening of the housing. The electrode assembly is provided in the housing and provided with a tab. The tab bracket is provided on a side of the end cover assembly facing the electrode assembly, where the tab is bent around the tab bracket. The fixing member is configured to fix the tab bracket to the end cover assembly.

Abstract: This application discloses a box assembly, a battery, and an electric apparatus. The box assembly includes a frame, where the frame includes a bottom plate and side plates arranged around the bottom plate, and the bottom plate and the side plates jointly enclose an accommodating cavity; and at least one heat exchange beam, where the heat exchange beam is disposed in the accommodating cavity to divide the accommodating cavity into a plurality of accommodating sub-cavities, and a heat exchange passage is provided in the heat exchange beam for circulating a heat exchange medium. The heat exchange beam can improve the overall rigidity of the frame. In addition, the heat exchange passage is provided in the heat exchange beam for circulating the heat exchange medium, so that the heat exchange beam is integrated with the heat exchange function.

Abstract: An electrode assembly includes a positive electrode plate, a separation member, and a negative electrode plate, where the separation member is disposed between the positive electrode plate and the negative electrode plate, and at least one of the positive electrode plate, the negative electrode plate, and the separation member is provided with a groove on a surface.

Abstract: Embodiments of the application provide a battery cell, a battery and an electric apparatus. The battery cell comprises a first case, a first electrode assembly, a second case, a second electrode assembly, and an end cover assembly. The first case is provided with a first opening. The first electrode assembly is accommodated within the first case. The second case is provided with a second opening opposite the first opening. The second electrode assembly is accommodated within the second case. The end cover assembly covers the first opening and the second opening, the end cover assembly includes a connecting assembly, and the connecting assembly is configured to electrically connect the first electrode assembly and the second electrode assembly. The first case and the second case, which are sequentially arranged, can increase the overall size of the battery cell, thereby increasing the space utilization of the battery cell in the battery.

Abstract: A battery unit, a battery module, and an electrical device are disclosed. The battery unit includes: a housing, where the housing comprises a first electrode terminal and a second electrode terminal; at least one battery cell, where the battery cell includes a first electrode plate and a second electrode plate, and the second electrode terminal is connected to the second electrode plate; and an adapter strip assembly, where the adapter strip assembly is sandwiched between the housing and the battery cell and includes a first adapter strip and a first bracket, and the first adapter strip is supported on the first bracket and connected to the first electrode terminal and the first electrode plate.

Abstract: A separator, a battery including the separator, and an electric apparatus including the battery. The separator includes a separator substrate, and the separator substrate satisfies at least one of the following conditions: the separator substrate includes a reinforced fiber layer; and at least one side surface of the separator substrate has a reinforced coating layer.

Abstract: An electrode plate includes a current collector and a film layer comprising an active material and an adsorptive polymer disposed on at least one side of the current collector, wherein: the adsorptive polymer satisfies: 3?m1/n?35, in which n represent a mass of the adsorptive polymer, and m1 represents a mass of a first substance that is obtained by: adding the adsorptive polymer to a predetermined electrolytic solution at 45° C. to form a polymer system, allowing the polymer system to stand for 60 hours at 45° C. and for ?24 hours at 25° C., and then filtering the polymer system through a 200-mesh screen to obtain the first substance; and the adsorptive polymer further satisfies: 1.00?m2/n?1.05, in which m2 represents a mass of a second substance, that is obtained by drying the first substance at 60° C. for ?24 hours.

Abstract: A separator has a positive electrode end and a negative electrode end in a thickness direction of the separator. The positive electrode end is provided with a plurality of first openings, the negative electrode end is provided with a plurality of second openings, and an aperture of the first opening is larger than an aperture of the second opening.

Abstract: A battery cell, a battery, and an electrical device are disclosed. The battery cell includes an electrode assembly, a shell, an electrode terminal, and a current collecting member. The electrode assembly has a tab. The shell accommodates the electrode assembly. The electrode terminal is disposed at one end of the shell in a first direction. The current collecting member is provided with a hollow region, and the hollow region divides the current collecting member into a first connection region and a second connection region located on two sides of the hollow region. The first connection region is connected to the tab, and the second connection region is connected to the electrode terminal. When the electrode terminal is subjected to stress, the hollow region enables the second connection region to deform relative to the first connection region, so the stress is not easily transmitted to the first connection region.

Abstract: A battery cell, a battery, an electric device and a welding apparatus are disclosed. The battery cell includes a housing, an electrode unit and an electrode lead member. The electrode unit is accommodated in the housing and includes a plurality of electrode tab sets arranged in a stacked way, and each of the electrode tab sets includes at least one electrode tab. The electrode lead member is arranged at the housing and includes a plurality of connection portions, each of the connection portions is welded to at least one of the electrode tab sets, and a plurality of electrode tab sets welded to the plurality of connection portions of the electrode lead member have a same polarity. By providing a plurality of connection portions on the electrode lead member, a layer amount of the electrode tabs welded to a single connection portion can be reduced.