T/CAEE 005-2025 The cleanliness requirements for aluminum die-castings used in new energy vehicles

Scope

Scope: This document specifies the technical requirements, testing methods, and rejection handling procedures for the cleanliness of aluminum die-casting parts used in new energy vehicles. This document applies to the cleanliness of aluminum die-casting parts used in new energy vehicles. It does not apply to the following: — Testing for oil, grease, and other film contamination; — Particle detection methods involving non-quantifiable visual assessments or wiping test parts with clean cloth; — Working fluids such as fuel, lubricating oil, coolant, and brake fluid. Main technical content: The technical requirements for the cleanliness of aluminum die-casting parts in new energy vehicles cover cleanliness technical indicators, a testing method system, rejection handling rules, and key supporting technologies. The cleanliness technical indicators set limits on foreign object weight and particle size for battery systems, motor systems, and electronic control systems. The testing method system includes extraction techniques, attenuation tests, and analysis methods to ensure testing accuracy. The rejection handling rules handle metal particles based on size into three categories: Grade A (directly re-wash and re-inspect), Grade B (if unqualified after secondary sampling, re-wash), and Grade C (negotiable for rework after secondary sampling). Key supporting technologies include blank test control, attenuation curve determination, specification for particle extraction equipment, and sample packaging and handling requirements, such as double-layered anti-contamination packaging and interface sealing. The core goal is to provide a quantifiable cleanliness control method for aluminum die-casting parts in new energy vehicles to ensure the reliability of the three electric systems.

Development Information

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