Abstract
Recently, large-scaled ESS is rapidly installed in Korea according to the green growth and carbon neutralization policy, however, the related industries have been severely damaged since the first ESS fire accident occurred in August, 2017. Even though diverse measures such as limiting the operation range of SOC and installing additional protection devices in ESS are being performed, fire accidents in ESS are being occurred continuously. And also, as the scale of fire accidents in ESS may be increased due to the thermal runaway and the fire can not be suppressed by using existing fire extinguishing facilities, researches on preventing the thermal runaway in Li-ion battery in advance are being required. Therefore, this paper evaluates the mechanism of off-gas and thermal runaway in Li-ion battery and proposes an off-gas detection algorithm to prevent thermal runaway in advance, and then implements an off-gas detection device, accordingly. From the test results of thermal runaway, installation location of off-gas sensors and malfunction of off-gas detection based on the proposed test device for evaluating the operation characteristics of off-gas detection device, it is confirmed that the off-gas detection device and algorithm can effectively prevent fire accidents in advance by accurately detecting the off-gas and avoiding the malfunction of off-gas detection due to irrelevant gas from surroundings.
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