Detail of GB 29743.2-2025

Introduction of GB 29743.2-2025

Motor vehicle coolant - Part 2: Electric vehicle coolant 1 Scope This document specifies the product classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of electric vehicle coolant. This document is applicable to the production, inspection, and use of the coolant for electric vehicles, which is formulated with ethylene glycol as the raw material for the antifreeze agent and is used in the thermal management systems for traction battery of pure electric vehicles, fuel cell electric vehicles, and hybrid electric vehicles with independent thermal management loops and using Class B voltage circuits. 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 528-2009 Rubber, vulcanized or thermoplastic - Determination of tensile stress-strain properties GB/T 711 Hot-rolled quality carbon structural steel plates sheets and strips GB/T 1173-2013 Aluminium alloy casting GB/T 1690 Rubber, vulcanized or thermoplastic - Determination of the effect of liquids GB/T 3190 Wrought aluminium and aluminium alloy - Chemical composition GB/T 5231 Designation and chemical composition of wrought copper and copper alloys GB/T 6031-2017 Rubber, vulcanized or thermoplastic Determination of hardness (hardness between 10 IRHD and 100 IRHD) GB/T 6682-2008 Water for analytical laboratory use - Specification and test methods GB/T 14832-2008 Test methods for compatibility between hydraulic fluids and standard elastomeric materials GB/T 19596 Terminology of electric vehicles GB 29743.1-2022 Motor vehicle coolant - Part 1: Fuel vehicle engine coolant GB/T 33402-2016 Silicone rubber compound - General purpose JT/T 1230 Standard test method for determination of inorganic anions in motor vehicle engine coolant - Ion chromatography NB/SH/T 0164 Petroleum and related products packaging, storage, transportation and acceptance of delivery rules NB/SH/T 0828 Standard test method for determination of silicon and other elements in engine coolant by inductively coupled plasma-atomic emission spectroscopy SH/T 0065 Sampling of test samples of engine coolant or antirust agent and preparation of its aqueous solution SH/T 0066 Standard test method for foaming tendencies of engine coolants in glassware SH/T 0067 Determination method for ash content in engine collant and antirust agent SH/T 0068 Standard test method for density or relative density of coolant concentrates and engine coolants by the hydrometer SH/T 0069 Determination of PH value of engine antifreezes, antirusts and coolants SH/T 0084 Standard test method for effect of cooling system chemical solutions on organic finishes for automotive vehicles SH/T 0086 Standard test method for water in engine coolant concentrate (Karl Fischer method) SH/T 0089 Standard test method for boiling point of engine coolants SH/T 0090 Standard test method for freezing point for engine coolants SH/T 0091 Standard test method for reserve alkalinity of engine coolants and antirusts SH/T 0604 Crude petroleum and petroleum products - Determination of density - Oscillating U-tube method SH/T 0620 Standard test method for corrosion of cast aluminum alloys in engine coolants under heat-rejecting conditions SH/T 0621 Determination of chlorine content in engine coolant 3 Terms and definitions For the purposes of this standard, the terms and definitions given in GB/T 19596 and the following apply. 3.1 electric vehicle general term for battery electric vehicles, hybrid electric vehicles, and fuel cell electric vehicles [Source: GB/T 19596-2017, 3.1.1, modified] 3.2 electric vehicle coolant functional liquid compounded with antifreeze, corrosion inhibitor and other raw materials and used in the thermal management system for electric vehicle traction battery and has the functions of cooling, anti-corrosion, anti-freeze and heat preservation Note: The coolant taken directly from the product's original packaging is usually referred to as "stock solution", which can be either coolant concentrate or coolant predilute. 3.3 electric vehicle coolant concentrate coolant used in the thermal management system of the traction battery of electric vehicles after dilution, with a water content not exceeding 5% 3.4 electric vehicle coolant predilute coolant that is directly used in the thermal management system of the traction battery of electric vehicles and has a specific freezing point value 4 Product classification The classification, code and model of electric vehicle coolant (hereinafter referred to as "the coolant") shall be as specified in Table 1. Table 1 Classification, code and model of the coolant

Contents of GB 29743.2-2025

Foreword i Introduction ii 1 Scope 2 Normative references 3 Terms and definitions 4 Product classification 5 Technical requirements and test methods 6 Inspection rules 7 Marking, packaging, transportation and storage Annex A (Normative) Test method for conductivity of the coolant Annex B (Normative) Test method for static corrosion of the coolant Annex C (Normative) Test method for corrosion of the coolant circulation bench Annex D (Normative) Test method for compatibility of the coolant and rubber materials Annex E (Informative) Specification of dilution water for the coolant concentrate