HE3DA batteries received certification in the USA by INTERTEK.
After long and very demanding tests, HE3DA batteries have successfully passed all safety tests for the U.S. market. The HE3DA battery with a capacity of 500Wh / 4V has passed all INTERTEK tests. Two samples of battery cells (a total of 14) were used in each test.
Intertek is a leader in testing with more than 46,000 employees in 1,000 locations in more than 100 countries.
1. Test: Short Circuit Test
Fully charged, conditioned cells are stored in an ambient temperature of 25°C ±5°C until their casing reaches ambient temperature, and then subjected to a short circuit condition using an external resistance of less than 20mΩ. The external resistance shall be applied to the cell terminals for 7h or until temperatures on the cell cool to within ±10°C of ambient conditions.
To Comply: As a result of the short circuit test, the cells shall not show signs of fire or explosion.
2. Test description: Cell Impact Test
Fully charged, conditioned cells are to be placed on a flat surface. A 15.8 ±0.1-mm diameter bar is to be placed across the center of the sample. A 9.1 ±0.46-kg weight is to be dropped from a height of 610 ±25mm onto the sample. A cylindrical, pouch, or prismatic cell is to be impacted with its’ longitudinal axis parallel to the flat surface and perpendicular to the longitudinal axis of the 15.9-mm diameter curved surface lying across the center of the test sample. A prismatic cell is also to be rotated 90˚ around its longitudinal axis so that both the wide and narrow sides are subjected to the impact.
To Comply: As a result of the impact test, the cells shall not show signs of fire or explosion.
3. Test description: Drop Impact Test
Fully charged cells shall be dropped three times from a height of 1m onto a flat concrete or metal surface. The cells shall be at an ambient temperature of 25˚C ±5˚C prior to testing. The cells shall be dropped in a manner that the impacts occur in random orientations. After completion of the impacts, the cells shall be subjected to a minimum one-hour observation period before being examined.
To Comply: As a result of the drop impact test, the cells shall not show signs of fire or explosion.
4. Test description: Heating Test
Fully charged, conditioned cells are to be heated in gravity convection or circulating air oven with an initial temperature of 20 ±5˚C. The temperature of the oven is to be raised at a rate of 5 ±2˚C per minute to a temperature of 130 ±2˚C and remain for 10 min. The sample shall return to room temperature then be examined. For batteries specified for temperatures above 100˚C, the conditioning temperature shall be increased from 130 ±2˚C, to 30 ±2˚C above the manufacturers maximum specified temperature. For a battery of lithium metal chemistry, the conditioning temperature shall be increased to a maximum of 170 ±2˚C.
To Comply: As a result of the heating test, the cells shall not show signs of fire or explosion.
5. Test description: Overcharge Test
Fully charged, conditioned cells shall be discharged in accordance with the manufacturer’s specifications down to the specified endpoint voltage. The test is conducted in an ambient of 25°C ±5°C at the start of the test. The voltage and temperature of the cell shall be monitored during the test. The cells are charged with a constant current at the maximum specified charge current until the voltage of the cell reaches 120% of the maximum specified charge voltage value or 130% SOC, whichever is reached first. The charge is then terminated while the cell temperature continues to be monitored. The test is concluded when the cell temperature drops and returns to ±10˚C of the test ambient.
To Comply: As a result of the overcharge test, the cells shall not show signs of fire or explosion.
6. Test description: Forced Discharge Test
Fully charged cells shall be discharged in accordance with the manufacturer’s specifications down to the specified endpoint voltage. The test is conducted in an ambient of 25˚C ±5˚C. The discharged cells are subjected to a forced discharge at a constant current 1.0 It A for 90 min with the discharge voltage limit not to exceed the numerical value of the upper limit charging voltage specified for the cell. If the discharge voltage limit is reached before the 90 min, the cell shall be discharged at a constant voltage discharge equal to the manufacturer’s determined low voltage cutoff, with the current decreasing as necessary until the 90 min time period is reached.
To Comply: As a result of the forced discharge test, the cells shall not show signs of fire or explosion.