Abstract: A cell assembly, a battery module, a battery pack and an energy storage system are provided. The cell assembly includes at least two cell units and at least one temperature equalization portion. At least two cell units are arranged at intervals along the Z direction. The temperature equalization portion is provided between two adjacent cell units along the Z direction. Each of the at least one temperature equalization portion is thermally connected to the two adjacent cell units, to equalize the temperatures of the two adjacent cell units.

Abstract: This application provides a battery module, a battery pack, and an electrical device. The battery module includes at least one battery group and multiple buffer members. The battery group includes multiple batteries arranged along a first direction. Each battery includes multiple positive electrode plates and multiple negative electrode plates alternately stacked along the first direction. In each battery, the positive electrode plate and the negative electrode plate respectively include portions that overlap with each other in the first direction to form an overlapping region, while the positive electrode plate and a remaining portion of the negative electrode plate do not overlap in the first direction, forming a non-overlapping region.

Abstract: A multi-tab battery and an electronic device are provided. The multi-tab battery includes a housing and a battery cell. The battery cell is arranged in the housing. The battery cell includes a separator, a positive electrode sheet, a negative electrode sheet, a plurality of positive electrode tabs and a plurality of negative electrode tabs. The plurality of positive electrode tabs are arranged at intervals along a first direction and protrude from the positive electrode sheet by a first length in an extension direction of the battery cell, and the plurality of negative electrode tabs are arranged at intervals along a second direction and protrude from the negative electrode sheet by a second length in the extension direction of the battery cell.

Abstract: A method includes: detecting initial capacities of multiple to-be-grouped battery cells, and grouping, among the to-be-grouped battery cells, battery cells to obtain a first battery pack; detecting an initial SOC of each battery cell in the first battery pack, and grouping the battery cells in the first battery pack to obtain a second battery pack; simulating a charging and discharging process of the second battery pack to obtain charging data and discharging data corresponding to the battery cell; and determining a grouping efficiency of the second battery pack based on the charging data, the discharging data, and a nominal capacity.

Abstract: Disclosed is a method for forming a tube with high internal pressure and low external pressure. The method comprises: putting a tube to be formed into a cavity, such that a bulging area (15) is formed between the tube to be formed and an inner wall of the cavity; continuously injecting a low-pressure fluid into the bulging area, and then injecting a high-pressure fluid into the interior of the tube to be formed, the high-pressure fluid creating a pressure on an outer wall of the tube to be formed such that the tube to be formed starts to expand to the bulging area; stopping the supply of the low-pressure fluid when the tube is bulged to conform to the inner wall of the cavity; and taking the formed tube out to complete a working cycle. Further disclosed is a forming machine for forming a tube according to the above method.

Abstract: Disclosed is a method for forming a tube with high internal pressure and low external pressure. The method comprises: putting a tube to be formed into a cavity, such that a bulging area (15) is formed between the tube to be formed and an inner wall of the cavity; continuously injecting a low-pressure fluid into the bulging area, and then injecting a high-pressure fluid into the interior of the tube to be formed, the high-pressure fluid creating a pressure on an outer wall of the tube to be formed such that the tube to be formed starts to expand to the bulging area; stopping the supply of the low-pressure fluid when the tube is bulged to conform to the inner wall of the cavity; and taking the formed tube out to complete a working cycle. Further disclosed is a forming machine for forming a tube according to the above method.