■ What is high temperature and high humidity test (temperature and humidity cycle test chamber)?
The high temperature and humidity/temperature and humidity cycle test of nickel-cadmium and nickel-metal hydride batteries is as follows: the battery is discharged to 1.0V at 0.2℃, and charged at 1℃ for 75 minutes before it is placed at 66℃, stored at 85% humidity for 192 hours (8 days), and kept at room temperature and humidity for 2 hours. The battery should not be deformed or leak, and the capacity recovery should be more than 80% of the nominal capacity.
■ Test Standard: IEC 62660-2
Thermal Test
This test is performed to characterize cell responses to high-temperature environment.
a) Adjust the SOC of the cell to 100% for BEV application, and to 80% for HEV application.
b) The cell, stabilized at room temperature, shall be placed in a gravity or circulating air-convection oven. The oven temperature shall be raised at a rate of 5K/min to a temperature of 130℃±2K. The cell shall remain at this temperature for 30 min before the test is discontinued.
Note-If necessary, to prevent deformation, the cell may be maintained during the test in a manner that does not violate the test purpose. The manner to prevent deformation should be representative of cells inside battery systems and battery packs.
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Temperature cycling
Battery Temperature cycling test chamber
This test is performed to characterize thermal durability of a cell by exposing at a low and high temperature environment alternately to cause expansion and contraction of cell components.
a) Adjust the SOC of the cell to 100% for BEV application, and to 80% for HEV application.
b) Perform the temperature cycling in accordance with ISO 16750-4 as shown in Table 4 the minimum operating temperature shall be -40℃ or Tmin specified by the cell manufacturer and the maximum operating temperature shall be 85℃ or Tmax specified by the cell manufacturer. Perform 30 test cycles as specified.
Table 4
