Abstract: An electrode assembly includes a positive electrode plate. The positive electrode plate features a single-sided groove embedded tab structure. The positive electrode plate includes a positive electrode current collector and a second positive electrode active material layer disposed on a second surface of the positive electrode current collector. The second positive electrode active material layer includes a second positive electrode active material, where the second positive electrode active material includes element M, and the element M includes at least one of manganese, iron, lanthanum, zirconium, or yttrium. The positive electrode plate of this application can enhance energy density of the electrochemical apparatus based on the existing embedded tab structure.

Abstract: An electrochemical apparatus, including an electrode assembly. The electrode assembly includes a negative electrode plate and a positive electrode plate. The negative electrode plate includes a first negative electrode active material layer, a negative electrode current collector, a second negative electrode active material layer, and a first layer. The positive electrode plate includes a first positive electrode active material layer, a positive electrode current collector, and a second positive electrode active material layer. The negative electrode plate includes a first negative electrode winding layer and a second negative electrode winding layer. A negative electrode single-coated region of the negative electrode current collector is located on at least the first negative electrode winding layer and the second negative electrode winding layer.

Abstract: A method for determining injection mass of electrolyte for a battery includes: determining a total volume V1 of pores in a positive electrode active material layer, a negative electrode active material layer, and a separator of the battery; determining a volume V2 of electrolyte required by the negative electrode active material layer to ensure battery cycles; determining a volume V3 of electrolyte consumed by the battery in a formation process; determining a volume V4 of electrolyte consumed by the battery in an injection process; and determining the injection mass of electrolyte for the battery: MEl=(V1+V2+V3+V4)×?El. The injection mass of electrolyte for the battery is closer to actual optimal injection mass, which improves the accuracy of the electrolyte injection process, provides better electrochemical performance of the battery, and lowers the research and development costs of the battery.

Abstract: An electrochemical device includes a first electrode plate and a first conductive plate. The first electrode plate includes a first current collector and a first conductive material layer. The first conductive material layer is disposed on a first surface of the first current collector. The first conductive material layer is provided with a first opening, where a first region of the first surface exposed at the first opening. The first conductive plate is connected to the first region. The first electrode plate includes a first end edge, and the first end edge is provided with a first recess. When viewed from a first direction, the first recess is spaced apart from the first region. The first conductive plate covers a part of the first region, a part of the first conductive material layer, and a part of the first recess.

Abstract: A button cell includes an electrode assembly, a first electrode tab, and a housing provided with an accommodating cavity. The housing includes a first wall, a first end of the first electrode tab is connected to the electrode assembly, and a second end of the first electrode tab is connected to the first wall. The housing is provided with a groove including at least two continuously connected curves. Viewed from a direction perpendicular to the first wall, a projection of the first electrode tab on the first wall is a first projection, at least a portion of the at least two continuously connected curves is located outside the first projection, and a quantity of intersection points between a contour of the first projection and the at least two continuously connected curves is less than or equal to 2.

Abstract: A button cell includes an electrode assembly, a first housing, and a second housing, where the first housing and the second housing are connected and mated to form an accommodating space. The electrode assembly is disposed in the accommodating space. The first housing includes a first bottom wall and a first side wall connected to the first bottom wall. The first bottom wall is provided with a groove. A size of the first bottom wall in a first direction is T ?m, and a size of the groove in the first direction is H ?m, where 0.1T?H?0.7T and the first direction is perpendicular to the first bottom wall.

Abstract: A battery includes an electrode assembly, a first housing, a second housing, and a first adhesive layer. The first housing is connected to the second housing. The first adhesive layer is located between the first housing and the second housing, the first adhesive layer includes a first section, a second section, and a third section, a boundary point between the first section and the second section is at a position from the bottom of the first adhesive layer to a distance of H/4 from a second end surface of the battery, and a boundary point between the second section and the third section is at a position at which an end of the second housing close to the first end surface is located. Thickness of the first section, thickness of the second section, and thickness of the third section are all different.

Abstract: An electrochemical device includes an electrode assembly. The electrode assembly is formed by winding a stacking body. The stacking body includes a first electrode plate, a second electrode plate and a separator film. The first electrode plate includes a first conductive layer, a first conductive material layer and a first layer. The first conductive layer includes a first surface and a second surface arranged oppositely in a third direction, wherein the first surface includes a first region and a second region arranged sequentially in a first direction. The first conductive material layer is disposed in the first region. The second region is exposed from the first conductive material layer. The first conductive material layer includes a first conductive material region and a first edge region, the first conductive material region and the first edge region are arranged sequentially along a second direction.

Abstract: A battery includes an electrode assembly, a first housing, and a second housing. The first housing includes a first bottom wall and a first peripheral wall. The second housing includes a second bottom wall and a second peripheral wall. The first peripheral wall is arranged outside the second peripheral wall in a sleeving manner. Here, the second peripheral wall includes a first annular segment and a second annular segment, the second annular segment is located on one side of the first annular segment back away from the second bottom wall, the first annular segment is spaced apart from the first peripheral wall with a spacing of T1, the second annular segment is spaced apart from the first peripheral wall with a spacing of T2, and 30%?T2/T1?95%.

Abstract: An electrode assembly includes a first conductive portion, a second conductive portion and a first metal portion. The first conductive portion includes a first region provided with a conductive material layer and a second region separated from the first region; the first metal portion is welded with the second region, and the first metal portion has a third region where a weld mark is formed; when being observed in a first direction perpendicular to a first surface of the first conductive portion, the second region has a first end and a second end; the third region has a third end and a fourth end; the first metal portion has a fifth end in a second direction, and a sixth end disposed on an opposite side of the fifth end in the second direction and closer to the second end than the fifth end.

Abstract: An hard shell battery includes a housing, an electrode assembly, a first gasket, a second gasket, a conductive member, and a fastening member. The first gasket is disposed on an outer surface of the housing, and the second gasket is disposed on an inner surface of the housing. The conductive member is electrically connected to the electrode assembly, a shaft portion of the conductive member extends through a through hole in the housing into an accommodating cavity of the housing. A restraint portion of the conductive member abuts on a side of the first gasket facing away from the accommodating cavity. The fastening member is disposed on a side of the second gasket facing away from the first gasket, and in interference fit with the shaft portion via a mounting hole. The conductive member and the fastening member jointly press against the second gasket.

Abstract: An electrochemical apparatus including a housing, an electrode assembly, and a first conductive plate. The electrode assembly is disposed in the housing. The conductive plate is electrically connected to the electrode assembly and extends out from the housing. The electrochemical apparatus further includes a first layer, where an extending direction of the conductive plate is a first direction, and in the first direction, the first layer includes a first region and a second region connected to each other, the first region being disposed inside the housing, and the second region being disposed outside the housing. A direction perpendicular to a surface of the conductive plate is a second direction, and viewed along the second direction, the second region partially overlaps the conductive plate. The second region includes a first protrusion and a second protrusion. In a third direction, the first protrusion is separated from the second protrusion.

Abstract: A battery includes a housing, an electrode assembly, a first layer and a second layer. The electrode assembly includes a first electrode plate, a second electrode plate, and a separator. The electrode assembly is wound. The first electrode plate includes a first edge and a second edge disposed opposite to each other along a winding direction and includes a first ending end towards the second edge. Viewed along a first direction, the electrode assembly includes a first surface. The second edge divides the first surface into a first region and a second region. The first region is a region containing the first ending end. The first layer is fixed to the first region and the second region. The second layer is fixed to the first surface and at a distance from the first layer, and the second layer bonds and fixes the electrode assembly to the housing.

Abstract: A battery including a housing, an electrode assembly, and tabs. The housing includes a first end wall, a second end wall, and a connecting wall portion. Both the first end wall and the second end wall are L-shaped and spaced apart in a thickness direction of the battery. The connecting wall portion extends from an edge of the first end wall toward the second end wall and encloses an L-shaped accommodating cavity, where the first end wall is provided as one end of the accommodating cavity, and the second end wall is provided as another end of the accommodating cavity.

Abstract: An electrode assembly formed by winding a stack. The stack includes a first conductive layer, a second conductive layer, and a first layer disposed therebetween. The stack further includes a first surface, a first end portion, and a second end portion located opposite to the first end portion. A stacking direction of the stack is a first direction. Viewed along the first direction, the first surface has, in a second direction perpendicular to the first direction, a first region located on one side of the first end portion and a second region located on the other side of the first end portion. In a winding direction of the stack, the first region is closer to the first end portion than the second region.

Abstract: An electrode assembly includes a stacked portion and a second layer. The stacked portion includes a first layer disposed between a first conductive layer and a second conductive layer. The stacked portion is a wound structure including a first surface and a first end portion. The second layer is connected to the first surface. When viewed in the first direction, the first surface has a first region located on a first side of the first end portion and a second region located on a second side of the first end portion. In a second direction perpendicular to the first direction, the first side and the second side are located on two opposite sides of the first end portion. When viewed in a winding direction of the stacked portion, the second region is closer to the first end portion than the first region.

Abstract: An electrochemical apparatus includes an electrode assembly and a conductive plate. The electrode assembly is of a wound structure and includes a first electrode plate including a first conductive layer and a first conductive material layer. The first conductive layer includes a first surface and a second surface. The first conductive material layer is provided on the first surface. The first surface includes a first region. The conductive plate is connected to the first region and extends out of the first electrode plate. The conductive plate includes a third region and a fourth region connected to each other. The third region includes a connection region. The conductive plate is connected to the first region through the connection region. The third region includes a first side, a second side, a third side, and a fourth side. The first region includes a fifth side, a sixth side, and a seventh side.

Abstract: A battery includes a housing; an insulation member; and a first active substance layer and a second active substance layer having opposite polarities. The housing includes a first wall body, a second wall body, and a third wall body, forming an accommodation cavity. The first wall body is a conductive wall body and disposed opposite to the third wall body. The insulation member, the first active substance layer, and the second active substance layer are accommodated in the accommodating cavity. The second active substance layer is disposed on a surface of the first wall body that faces the third wall body. The first active substance layer is disposed between the second active substance layer disposed on the surface of the first wall body and the third wall body. The insulation member is disposed between the first active substance layer and the second active substance layer.

Abstract: A battery including a first conductive part, an electrode assembly, a second conductive part, and a first layer. The first conductive part includes a cover part and a concave part connected to the cover part. The concave part includes a first wall and a first side wall connected to the first wall. The electrode assembly is electrically connected to the first conductive part and the second conductive part, and is configured inside the concave part. Viewed in a first direction, the second conductive part and the electrode assembly partly overlap, the second conductive part is located in the first conductive part, the second conductive part includes a first surface and a second surface, and the second surface faces away from the first conductive part. The first layer includes a part located between the first conductive part and the second conductive part; and an insulating material.

Abstract: A battery including a first conductor and a first conductive material layer. The first conductor includes a first surface and a second surface. The first surface and the second surface are two opposite surfaces of the first conductor. The first conductive material layer is disposed on the first surface. The first conductive material layer includes a first recess. The first conductor further includes a first region and a second region. A first preset spacing exists between the first region and the second region. The first region is exposed from the first recess. The second region is provided without the first conductive material layer. The battery further includes a first conductive plate. In the second region, the first conductor is connected to the first conductive plate.