Abstract: Embodiments of the present disclosure provide a datum selection method for minimizing hole position errors in group hole machining of large components, comprising: 1) determining a type of a computer numerical control (CNC) machine tool and establishing a topological structure of the CNC machine tool; 2) establishing a theoretical postural model of a tool center point during a motion; 3) establishing a hole position error model; 4) establishing an average error model of hole positions in group hole machining; and 5) obtaining a machining datum for group holes of corresponding components. For the skeleton and skinned group hole machining of aircraft components, different principles of datum selection are provided respectively, which can effectively improve the positional accuracy of the skeleton or skinned group hole machining, at the same time provides a more scientific and reasonable approach for the datum selection in group hole machining of large components.

Abstract: A cyclic sulfonate additive for an electrolyte of a lithium-ion battery (LIB) is disclosed, with a structure shown in formula I: A non-aqueous electrolyte of a LIB can be prepared with the cyclic sulfonate additive for the electrolyte of the LIB as one of additives, together with a non-aqueous solvent, and an electrolyte lithium salt, and arranged between a negative electrode and a positive electrode to fabricate a LIB. The present disclosure provides a use of the cyclic sulfonate additive in a LIB, which can effectively inhibit the reduction of battery capacity during high-temperature cycling and high-temperature storage, and can also inhibit the decomposition of an electrolyte to produce a gas.