Detail of QC/T 1204.2-2024

Introduction of QC/T 1204.2-2024

QC/T 1204.2-2024 Compatibility of on-board battery swap system for battery electric passenger vehicles - Part 2: Battery swap cooling interface 1 Scope This document specifies the requirements and test methods for the compatibility of the cooling interface of the on-board battery swap system for battery electric passenger vehicles. This document is applicable to the cooling interface of the on-board battery swap system for battery electric passenger vehicles. 2 Normative references The following documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 19596 Terminology of electric vehicles GB/T 30038 Road vehicles - Degrees of electrical equipment protection (IP-code) GB/T 32879-2016 General requirements for swapping battery pack connector of electric vehicle GB 38031-2020 Electric vehicles traction battery safety requirements 3 Terms and definitions For the purposes of this document, the terms and definitions given in GB/T 19596 and the following apply. 3.1 cooling connector assembly interface connecting the liquid cooling system of the complete vehicle and that of the battery swap pack Note: It consists of the pack connector and the vehicle connector, and can automatically cut off the coolant when disconnected and automatically turn on the coolant when connected. 3.2 pack connector part of the cooling interface connected with the battery pack Note: Generally, it has guiding function and a floatable valve core inside, referred to as "pack end" for short. 3.3 vehicle connector part of the cooling interface connecting to the electric vehicle or charging rack Note: Generally, it has the feature of floating mechanisms, including the side where the valve body can be opened, and the valve core is wrapped when plugged into each other, referred to as the "vehicle end" for short. 3.4 floating mechanism mechanism in the cooling interface that can correct the matching error between the pack end and the vehicle end 4 Requirements for compatibility of cooling interface 4.1 Interface requirements 4.1.1 Critical dimensions The critical dimensions and parameters of the cooling interface shall meet those specified in Table 1. 4.1.2 Spring force It is based on the spring force value during interactions; the compatibility can be realized only after meeting those specified in Table 2. 4.1.3 Cooling medium The cooling medium shall be 50% ethylene glycol and 50% water. 4.1.4 Water inlet and outlet The water inlet and outlet of the battery pack shall be located at the right and left side of the direction of vehicle forward motion, as shown in Figure A.7. 4.1.5 Sealing method Radial seal shall be adopted for the valve core. 4.2 Interface performance requirements 4.2.1 Floating requirements The floating mechanism of the cooling interface may allow the plug and socket to be mated and separated with a certain offset error. After the floating capacity test is carried out as per 5.3, the error correction ability in X, Y and Z directions shall be within the range of -5 mm to 5 mm. See Figure A.8 for details of horizontal floating range. At the same time, the angle error correction ability shall be -1° to 1°. Note: Refer to the definition of vehicle coordinate system given in GB/T 12673 for X, Y and Z directions. 4.2.2 Air tightness After the air tightness test is completed as per 5.4, at least one of the following requirements shall be met; a) Wet test: There shall be no visible bubbles; b) Dry test: The leakage from the cooling interface shall not exceed 0.5 mL/min; c) Ammonia test: The leakage from the cooling interface shall not exceed 2×10-6 Pa·m³/s. 4.2.3 Requirements for insertion-withdrawal force After the insertion-withdrawal force test is completed as per 5.5, the insertion-withdrawal force applied on the cooling interface shall not be greater than 350 N. 4.2.4 Requirements for pressure drop The pressure drop value at room temperature after the vehicle end and the pack end is assembled shall meet those specified in Table 3.

Contents of QC/T 1204.2-2024

Contents Foreword III Introduction IV 1 Scope 2 Normative references 3 Terms and definitions 4 Requirements for compatibility of cooling interface 5 Test method for compatibility of cooling interface Annex A (Informative) Sectional view and fitting status diagram of cooling interface Bibliography