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Terminals serve as the critical components within wire harnesses, enabling electrical connections and transmitting current and signals. The quality of their crimp joints directly determines the harness's overall reliability, durability, and safety. Based on structural design, terminals are primarily classified into two categories: open-barrel (or open-style) and closed-barrel (tubular). Open-barrel terminals are predominantly used in conventional low-voltage harnesses, where the crimping process is well-established and mature. In contrast, closed-barrel terminals, benefiting from their fully enclosed structure which provides superior mechanical strength, enhanced sealing, and improved vibration resistance, have become the mainstream choice for high-voltage harnesses in new energy vehicles. Concurrently, to meet the stringent electromagnetic compatibility (EMC) requirements of high-voltage systems, the crimping of shield rings has also emerged as an essential manufacturing process for high-voltage harnesses. This article aims to provide a detailed examination of the predominant crimping methods for tubular terminals and shield rings in high-voltage harnesses, offering professional guidance for process selection and quality control.