2022 November 29, Shanghai a new energy company energy storage battery products obtained UL9540A certification, marking the company's research and development and production of battery products by the global energy storage battery leading standards of recognition, with a high safety level, Ancojet to help the company better develop the international energy storage market.
UL9540A test is a test method to evaluate the spread of large-scale thermal runaway fire of battery energy storage system. It has been widely recognized and adopted by relevant authorities and has become a landmark industry standard. The test report is also a "pass" for energy storage products in the North American market ".
UL 9540A divides energy storage product testing into four levels: cell level, module level, unit (cabinet) level and installation level. Next, Ancogen will briefly describe UL9540A-cell testing purpose, testing process and testing requirements.
UL9540A-Cell-Test Purpose:
1. Determine the method and parameters of cell thermal runaway;
2. Determine the exhaust temperature of the cell;
3. Determine the thermal runaway temperature of the battery core;
4. Thermal runaway gas analysis (composition and performance).
UL9540A-Cell-Test Procedure:
1. Sample pretreatment
1.1 The battery cell shall be charged and discharged for two cycles according to the manufacturer's regulations;
keep the cell charged to 100%SOC before the 1.2 test, and keep it still for at least 1h and at most 8h;
1.3 In order to prevent excessive expansion during testing, the cells should simulate the binding conditions (e. g. fixed steel plates) in the BESS module.
2. Thermal runaway test
2.1 Place the battery core in a sealed explosion-proof tank, and fill the tank with nitrogen;
2.2 Use a flexible film heater to induce thermal runaway of the cell (if it cannot be triggered, use acupuncture, overcharge, alternative heat source, etc.);
temperature measurement throughout the 2.3 initiation process. Record the exhaust temperature and thermal runaway start temperature;
2.4 collecting battery cells to discharge gas;
3. Gas analysis and combustible gas combustion limit measurement
3.1 analysis of gas composition.
The combustion limit of the gas is 3.2 measured according to the composition of the combustible gas of the gas.
3.3 measure the combustion rate of the gas, the maximum explosion pressure of the gas.
4. Monitoring data
4.1 thermal runaway method
4.2 cell exhaust temperature
4.3 cell trigger thermal runaway temperature
4.4 the composition of the released gas;
total 4.5 gas;
lower flammability limit of 4.6 gas;
4.7 gas combustion rate;
maximum explosion pressure of 4.8 gas.
UL9540A-Cell-Test Report shall include the following:
1. Battery manufacturer name and battery model
2. The detailed parameters of the test unit (and whether it conforms to UL1973)
3. Energy storage technology (and compliance with UL9540)
4. The rated capacity of the battery
5. Voltage and current parameters of pre-treatment battery
6. Open circuit voltage of the battery after the test starts
7. Methods for triggering thermal runaway
8. The surface temperature of the battery during the first exhaust
9. Maximum battery surface temperature when thermal runaway is triggered
10. Generation and composition measurement of flammable gases
11. Lower Flammability of Battery Exhaust
12. Burning speed of battery scheduling
13. Maximum exhaust power Pmax
UL9540A-Cell-NOTE:
if the battery cell meets:
module testing is not required.
Note: In theory, current lithium-ion technology cannot meet the test-free conditions.