To investigate the causes and characteristics of asymmetric pressure distribution in scroll chambers，mathematical models for geometric analysis and thermodynamic processes were established based on asymmetric features.Dynamic pressure measurement tests inside the scroll chamber of an electric vehicle scroll compressor were conducted，validating model rationality.Under pressure ratios of 2 and 5 and rotational speeds of 3 000 r/min and 8 000 r/min，pressure variations in scroll chambers，valve rear chambers，exhaust ports，and pressure relief ports versus orbiting scroll angle were calculated.Results show that with a 50° difference in end angles between fixed and orbiting scrolls，a pressure difference of approximately 0.02 MPa exists in bilateral scroll chambers during early‑mid compression.At pressure ratio 5，asymmetric pressure distributions remain similar across speeds，with maximum discharge pressure reaching 2.1 MPa at high speeds indicating severe over‑compression.At 3 000 r/min，asymmetric pressure characteristics differ with increasing pressure ratios due to changes in the relative magnitude of designed internal versus operational external pressure ratios.Under low pressure ratios，implementing pressure relief structures reduces indicated power by 1.4% at 3 000 r/min but increases it by 0.65% at 8 000 r/min compared to non‑relief configurations.This study provides guidance for scroll profile design and optimization.