QC/T 1204.2-2024Interchangeability of on-board battery swap systems for battery electric passenger vehicles - Part 2: Battery swap cooling interface (English PDF)

3.1 Cooling connector assembly

An interface connecting the liquid cooling system of the complete vehicle and the liquid cooling system of the battery swap pack.

NOTE: It has the function of automatically cutting off the coolant when disconnected and automatically turning on the coolant when connected, including pack connector and vehicle connector.

5.2 Accuracy of Test Instruments

The accuracy of the measurement instruments shall not be lower than the following requirements:

a) Temperature measurement device: ± 1 °C;

b) Time measurement device: ± 1% FS (above 1 min), ± 5% FS (below 1 min);

c) Flow measurement device: ± 0.2 L/min;

d) Pressure measurement device: ± 0.1% FS;

e) Mass measurement device: ± 0.1% FS.

5.3 Floating Capability Test

Install the cooling interface component on a special tooling that can adjust its displacement, and respectively measure the maximum floating amount and maximum correction angle in the X, Y and Z directions.

5.4 Air Tightness Test

Respectively carry out air tightness test on the cooling interface assembly, and pack-end and vehicle-end parts, and choose one of the following three modes for testing:

a) Wet inspection: on the wet sealing performance test bench, pass 205 kPa compressed air to the liquid cooling system immersed in water, and observe the bubbles in the water for 120 s;

b) Dry inspection: on the dry sealing performance test bench, pass 205 kPa compressed air into the liquid cooling system, inflate for 120 s, maintain pressure for 120 s, and the test duration is 60 s;

c) Helium inspection: put the liquid cooling system into the helium inspection box, pass 205 kPa helium gas (concentration: 80%) into the liquid cooling system, maintain pressure for 30 s, and the test duration is 60 s.

5.5 Plug-in and plug-out Force Test

In accordance with the requirements of 6.4 in GB/T 32879-2016, install the cooling interface component of the battery pack for battery swap on an equipment that can measure pulling force and pushing force. At a speed of 10 mm/s, perform plug-in and plug-out. After 30 cycles of plug-in and plug-out, record the measured values of the plug-in and plug-out force.

5.6 Pressure Drop Test

5.6.1 After combining the cooling interface, connect the inlet and outlet to the flow pressure drop machine, and the coolant temperature is 25 °C.