Standard No.:	QC/T 1206.2-2024
English Name:	Thermal management system for electric vehicle traction battery - Part 2 : Liquid cooling system
Chinese Name:	电动汽车动力蓄电池热管理系统 第2部分：液冷系统
Chinese Classification:	T47    New energy vehicle and other automobiles
Professional Classification:	QC    Professional Standard - Automobile
Source Content Issued by:	MIIT
Issued on:	2024-07-05
Implemented on:	2025-1-1
Status:	valid
Target Language:	English
File Format:	PDF
Word Count:	5000 words
Translation Price(USD):	150.0
Delivery:	via email in 1~3 business day

QC/T 1206.2-2024 Thermal management system for electric vehicle traction battery - Part 2: Liquid cooling system 1 Scope This document specifies the technical requirements and test methods for electric vehicle traction battery (hereinafter referred to as “battery”). This document is applicable to the research, development and test of liquid cooling system and its parts and components for electric vehicle traction battery. 2 Normative references The following normative 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 2408-2021 Plastics - Determination of burning characteristics - Horizontal and vertical test GB/T 19596 Terminology of electric vehicles GB 38031-2020 Electric vehicles traction battery safety requirements QC/T 468-2010 Automobile radiator QC/T 1206.1-2024 Thermal management system for electric vehicle traction battery - Part 1: General requirements 3 Terms and definitions For the purposes of this document, the terms and definitions given GB/T 19596 and QC/T 1206.1-2024 as well as the following apply. 3.1 liquid cooling system system that uses coolant (such as mixed solution of ethylene glycol and water) as heat exchange medium to cool the battery Note: It is generally composed of liquid cooling plate, liquid cooling pipeline, joint, water inlet and outlet assembly and other parts and components, as shown in Figure 1. Figure 1 Schematic diagram for liquid cooling system 3.2 liquid cooling plate component that cools or heats a battery using coolant 3.3 liquid cooling pipeline pipeline that directs the coolant to the liquid cooling plate 3.4 jointer component connecting the liquid cooling plate and the liquid cooling pipeline or between the liquid cooling pipelines 3.5 flow resistance flow resistance of the coolant flowing through the liquid cooling system 4 Requirements 4.1 General requirements 4.1.1 Appearance The appearance of each part and component of the liquid cooling system shall be clean and undamaged, and the marks shall be clear. 4.1.2 Dimension and mass The dimension and mass of each part and component of the liquid cooling system shall meet the requirements of technical drawings. 4.2 Flow resistance After the flow resistance test is carried out according to 5.4, the flow resistance of the liquid cooling system shall meet the technical requirements specified by the manufacturer. 4.3 Safety performance 4.3.1 Airtightness After the airtightness test is carried out according to 5.5, at least one of the following requirements shall be met: a) wet test: there shall be no visible bubbles; b) dry test: the leakage amount shall not be greater than 2.5mL/min; c) helium test: the leakage rate shall not be greater than 2×10-6Pa•m3/s. 4.3.2 Flame retardance After the flame retardance test is carried out according to 5.6, the horizontal combustion level of non-metallic parts of the liquid cooling system shall meet the requirements of Level HB specified in GB/T 2408-2021. 4.4 Technical requirements 4.4.1 Pressure resistance After the pressure resistance test is carried out according to 5.7, the liquid cooling system shall have no leakage, and the deformation amount shall not exceed 10% of the original dimension in the deformation direction. 4.4.2 Vibration After the vibration test is carried out according to 5.8, the liquid cooling system shall meet the requirements of 4.3.1. 4.4.3 Welding strength After the welding strength test is carried out according to 5.9, there shall be no damage or crack at the welded area of the jointer. 4.4.4 Burst pressure During the burst pressure test according to 5.10, the liquid cooling plate and liquid cooling pipeline shall be free from damage or looseness. 4.4.5 High and low temperature cycle After the high and low temperature cycle test is carried out according to 5.11, the liquid cooling system shall meet the requirements of 4.3.1. 4.4.6 Internal corrosion After the internal corrosion test is carried out according to 5.12, the liquid cooling system shall meet the requirements of 4.3.1. 4.4.7 Pressure alternating After the pressure alternating test is carried out according to 5.13, the liquid cooling system shall meet the requirements of 4.3.1.

Contents Foreword i Introduction i 1 Scope 2 Normative references 3 Terms and definitions 4 Requirements 5 Test methods 6 Inspection rules 7 Marking, packaging, transportation and storage