What is the role of film heaters in testing thermal runaway fire propagation in battery energy storage systems?
2023-04-11
With the rapid increase in the demand for energy storage batteries, the shipment volume has increased significantly, and a large number of related companies have entered the energy storage market. In order to enhance their product image and quality, improve product competitiveness, to meet the needs of each country or region. In this process, the thin film heater plays an important role in the thermal runaway fire propagation test of battery energy storage system.
The role of film heater in thermal runaway fire propagation test of battery energy storage system:
1. Sample pretreatment: charge and discharge the cell for two cycles according to the manufacturer's regulations; Before the test, keep the cell charged to 100%SOC and stationary for at least 1h and at most 8h; To prevent overexpansion during testing, the cell should simulate the binding conditions in the bess module (such as a fixed steel plate).
2. Thermal runaway test: place the cell in a sealed explosion-proof tank, which is filled with nitrogen; The flexible film heater is used to induce the thermal out-of-control of the electric cell (if it cannot be triggered, it can be triggered by acupuncture, overcharging, alternative heat source, etc.); Temperature is measured throughout the initiation process. Record the exhaust temperature and thermal runaway start temperature; Collect the cell and discharge the gas.
3. Gas analysis and measurement of combustible gas combustion limit: analysis of gas composition; The combustion limit of a gas is measured according to the combustible gas component of the gas; The combustion rate of gas and the maximum explosion pressure of gas are measured.
