Since the electric vehicle battery (EVB) is wildly recycled in industry, the disassembly procedures of variable EVBs is so important that can influence the efficiency and environmental impacts in remanufacturing. To improve disassembly efficiency in EVB remanufacturing, a disassembly sequence planning method based on frame-subgroup structure is proposed in this paper. Firstly, the improved disassembly relation hybrid graph and disassembly relation matrix are proposed to identify the disassembly precedence relationship and connection relationship between the components in EVB. Secondly, the frame - subgroup structure is given, and the method for solving disassembly sequence planning with frame-subgroup structure and genetic algorithm is introduced. In this method, to simplify the series of processes such as encoding, decoding, crossover and mutation, the solution space composed of all disassembly sequences is transformed into the positive integer sequence for the disassembly efficiency in battery remanufacturing. Finally, the case study of EVB disassembly sequence planning is presented to validate the feasibility of this proposed method. Comparing with other traditional methods, the advantage and application of this proposed method are introduced.
In view of the present situation that the recovery of waste thermosetting plastics and products is difficult and the utilization rate is low, regeneration mechanism, regeneration methods and recycling process of waste thermosetting plastics under mechanical thermal coupling fields are proposed. Regeneration powders of Thermosetting Phenolic plastic are obtained by mechanochemical activated regeneration methods, the molecular structure, properties and crosslink density of phenol regeneration materials are analyzed. Analysis results show that network crosslinked molecular structure was destroyed, reactive groups produced and the crosslink density decreased. The activity of regeneration powders was reinforced and its plasticity was also improving, so the utilization rate was improved. Regeneration composite plastics were manufactured by hot press molding or extrusion compression molding. The microstructure of regeneration composite plastics was analyzed, and its mechanical strength was tested. Results showed that the tensile strength and bending strength of samples (weight ratio ≥ 50%) respectively exceed 15.88 MPa and 33.49 MPa. At last process parameters for regeneration effects were discussed, and these parameters were optimized. When particle size was 80 mesh (size ≤ 0.18 mm), quality proportion was 50~70%, pressure was 10Mpa, heating temperature was 180~190 o C, the optimal effects for regenerated composite were achieved.
Considering the cost and performance of the remanufactured motor, a motor remanufacturing method with a hybrid stator core structure was proposed, a prototype of the remanufacturing motor was made and the experiment was carried out. The modified magnetic circuit model of the hybrid stator motor was established by fitting the B–H curves of the two materials to consider the influence of the stator material. The errors for silicon steel and amorphous alloy were approximately 4.9 and 4.3%, respectively. The variation in no‐load air‐gap magnetic density along the axial direction was studied via simulation, and the air‐gap flux density decreases gradually from the centre of silicon steel segment to the centre of amorphous alloy segment. A deflection occurs in the distribution of the air‐gap magnetic field, which is in connection with the saturation degree of the materials. The method for calculating the air‐gap magnetic density of the hybrid laminated stator from the magnetic density of the two materials was proposed. Compared with the stator composed of only one material, the calculation result obtained by the proposed method is in good agreement with the simulation result, with an error of <5%.
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