A Li-ion battery can overheat, swell, leak electrolytes, vent fires, smoke, and explode in worst-case scenarios.
FREMONT, CA: It is possible to use energy storage systems (ESSs) to store renewable energy and release it as electricity when necessary, providing a cleaner alternative to fossil fuels for power generation. ESSs can provide energy to the energy industry during regular operations and during power outages, which can be extremely beneficial.
Compared to other energy storage technologies like mechanical flywheels, electrical supercapacitors, superconducting magnetic storage, thermal storage like latent phase change materials, and chemical storage like fuel cell types, electrochemical storage has taken a huge leap in adoption.
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Electrical hazards: Li-ion cells and batteries can be overcharged if charged too fast or at a voltage that exceeds the manufacturer's recommendations and if charging current limits are not properly designed into the system. Destabilization of the cathode, lithium dendrite formation, and electrolyte decomposition can lead to catastrophic events. Furthermore, as cells and batteries age, their electrochemical characteristics change, such as capacity and internal resistance, and this can cause deviations in characteristics between cells within a battery. A catastrophic failure can result if the cells and bank are not balanced, resulting in voltage excursions beyond safe limits.
Thermal hazards: Li-ion cells and batteries may experience different unsafe conditions at high and low temperatures. As a result of high temperatures, the electrolyte, the solid-electrolyte interface (SEI), and the cathode and anode can decompose, causing a violent venting, fire, and thermal runaway. In Li-ion cells, low temperatures increase the viscosity of the electrolyte, causing lithium ions to move less. Consequently, the reduced ease of intercalation into the anode causes the ions to accumulate as dendritic lithium metal due to the reduction in ionic conductivity. In the presence of high internal cell temperatures due to increased internal resistance, lithium metal dendrite formation, and the flammable organic electrolytes, a thermal runaway, and fire are inevitable consequences. If large ESS battery designs are designed to minimize hazardous conditions due to low-temperature charging or operation, a sensing logic can determine the battery's temperature and heat it until it reaches a temperature the manufacturer recommends for charging. A heater's power should be controlled to prevent uncontrolled heating when it fails.
Mechanical hazards: Natural disasters such as earthquakes can result in mechanically induced hazards, such as vibration, shock, and impact. During all three mechanical events, faults are caused by disruptions in the interior construction of cells, breakage of cell tabs or intercellconnections, distorted or torn separators that create contacts between the cathode and the anode, and other defects that can cause an internal short circuit or high temperatures, both of which may cause a catastrophic thermal runaway. The cells and system should be carefully inspected before and after installation of the entire system. Even though such environmental hazards are uncommon during field use, such as natural disasters, they can be encountered during transport to their final location.