Abstract: Provided are a preparation method of a current collector assembly, a current collector assembly, a battery cell, and a battery pack. The preparation method of the current collector assembly includes: abutting the at least one of the connection plate or the protection plate having the protrusion against the plurality of tabs; generating a high-frequency vibration between the at least one of the connection plate or the protection plate having the protrusion and the plurality of tabs; and piercing the plurality of tabs sequentially by the protrusion through the high-frequency vibration. A vibration frequency of the high-frequency vibration ranges from 15 KHz to 40 KHz.

Abstract: The present invention discloses a casing for a battery and the battery. The casing for the battery comprises a body. The body comprises a shell and at least one cover; at least one end of the shell is open; the cover is arranged at the one end of the shell; the shell comprises at least one first shell portion and a second shell portion which are connected to each other; the first shell portion is opposite to the cover; a thickness of the first shell portion is larger than that of the second shell portion; and a groove recessed toward a central axis direction of the shell is formed in the first shell portion.

Abstract: Energy storage cabinet and energy storage device are provided. The energy storage cabinet includes: a plurality of columns, a plurality of beams, and a plurality of lifting assemblies. The plurality of columns is arranged at intervals. Each of the beams is connected between two adjacent columns. The plurality of columns and the plurality of beams jointly enclose to form an accommodating space. The plurality of lifting assemblies is connected to the plurality of columns respectively. The lifting assembly includes a lifting plate. The lifting plate is provided with a lifting hole. The lifting hole is used to be hooked by a hook of a lifting machine to lift the energy storage cabinet.