GB 29743.2-2025 Motor Vehicle Coolant Part 2: Electric Vehicle Coolant

scope
This document specifies the product classification, technical requirements, testing methods, inspection rules, as well as labeling, packaging, transportation, and storage of electric vehicle coolant.
This document is applicable to the production, inspection, and use of coolant for electric vehicles formulated with ethylene glycol as the antifreeze material in the power battery thermal management system of pure electric vehicles, fuel cell electric vehicles, and hybrid electric vehicles with independent thermal management circuits and B-class voltage circuits.

Terms and definitions
The terms and definitions defined in GB/T 19596 and the following are applicable to this document.
Electric vehicle
The general term for pure electric vehicles, hybrid electric vehicles, and fuel cell electric vehicles.
[Source: GB/T 19596-2017, 3.1.1, modified]
Electric vehicle coolant
A functional liquid composed of antifreeze, corrosion inhibitor and other raw materials, used in the thermal management system of electric vehicle power batteries, with cooling, anti-corrosion, antifreeze and insulation functions.
Note: The coolant directly taken out from the original packaging of the product is usually referred to as the original liquid, which can be either a concentrated coolant or a diluted coolant.
Electric vehicle coolant concentrate
The coolant with a moisture content of no more than 5%, diluted and used for the thermal management system of electric vehicle power batteries.
Electric vehicle coolant diluent
Directly used in the thermal management system of electric vehicle power batteries, the coolant has a specific freezing point value.

Product Category
The classification, code, and model of electric vehicle coolant (hereinafter referred to as' tram coolant ') shall comply with the provisions of Table 1.


Technical requirements and testing methods
General requirements and test methods
The general requirements and test methods for electric vehicle coolant shall comply with the provisions of Table 2.


Physical and chemical performance requirements and testing methods
The physical and chemical performance requirements and testing methods of tram coolant shall comply with the provisions of Table 3.


Test Method
Density (20.0 ° C)/(g/cm)³) SH/T 0068、SH/T 0604
SH/T 0604-2000 Determination of Density of Crude Oil and Petroleum Products (U-tube Method)

Moisture (mass fraction)/% SH/T 0086
SH/T 0086-1991 Method for determination of water content in concentrated engine coolant (Karl Fischer method)

Chlorine content/(mg/kg) SH/T 0621, JT/T 1230
SH/T 0621-1995 Determination of Chlorine Content in Engine Coolant

Reserve alkalinity/mL SH/T 0091
SH/T 0091-1991 Determination of reserve alkalinity of engine coolant and rust inhibitor


Kyoto Electronics KEM U-shaped vibrating tube method digital density meter DA-840
Kyoto Electronics KEM Karl Fischer Volumetric Moisture Analyzer MKV-710S
Kyoto Electronics KEM Four Channel Potentiometric Titration Automatic Titration Instrument AT-710M