Characteristics of External Short-Circuit in Li-ion Battery Considering Operation and Environment Factors

Jung, Jae-Beom; Lim, Min-Gyu; Kim, Jin–Yong; Rho, Dae-Seok

doi:10.5762/kais.2021.22.8.663

Cited by 2 publications

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“…Therefore, the battery cell is in thermal run during which the temperature of the battery is rapidly raised, and there is a poss that a fire or explosion may occur due to the thermal propagation phenomenon [1 The level of risk in the battery in terms of an external short circuit is determined by ational and environmental factors such as SOC, short-circuit resistance, preproc temperature and protection devices. The short-circuit current and temperature inc when the SOC of the battery cell is high or the short-circuit resistance is low [17]. ever, it may be difficult to confirm the degree of risk to the battery, as the effect of th is lessened when the external short-circuit resistance is high.…”

Section: Mechanism Of External Short Circuit In Li-ion Batterymentioning

confidence: 99%

Safety Assessment for External Short Circuit of Li-Ion Battery in ESS Application Based on Operation and Environment Factors

et al. 2022

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In recent years, the demand for medium and large secondary batteries in EV (electric vehicle) and ESS (energy storage systems) applications has been rapidly increasing worldwide, and accordingly, the market size is increasing exponentially. However, the recent fire accidents related to secondary batteries for EVs and ESS are having a negative impact on the battery market. Therefore, this paper implements an accident simulation device to perform an external short-circuit test, one of the typical safety tests for NMC-series prismatic and pouch-type batteries that are widely used among battery cells used in medium and large secondary batteries. The implemented accident simulation device for the external short-circuit test is composed of short-circuit resistance, measuring device, control device, etc., and is configured to analyze external short-circuit characteristics according to various test conditions. Based on this, an external short-circuit test according to the type, short-circuit resistance and SOC (states of charge) of the lithium-ion battery was performed to confirm the current and temperature characteristics according to each condition. As a result of performing an external short-circuit test for each protection device in the battery module and preprocessing temperature, it is certain that the module fuse operates over 120 times faster than the cell fuse based on the same SOC conditions, and the quantity of electric charge in the module fuse is over 110 times smaller than of the cell fuse in the case of a short-circuit fault. It is also found that the highest and lowest preprocessing temperatures are considered to be severe conditions. Based on the proposed mechanism of an external short circuit in a Li-ion battery and the test device for the external short circuit, it is confirmed that this paper can contribute to the safety assessment of Li-ion battery-based ESS.

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Section: Mechanism Of External Short Circuit In Li-ion Batterymentioning

confidence: 99%

Safety Assessment for External Short Circuit of Li-Ion Battery in ESS Application Based on Operation and Environment Factors

et al. 2022

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“…Sales in South Korea by 2030 are estimated to be 3 million units based on the "National Roadmap for 2030" according to the cumulative base, compared to around 93,000 units in 2020. As a result, the market of used EV batteries is also expected to significantly increase [1][2][3]. On the other hand, since used batteries require full inspections due to the degradation characteristics, which vary depending on the operation environment and conditions, numerous studies on saving the time cost for the inspections have been carried out [4].…”

Section: Introductionmentioning

confidence: 99%

Evaluation Method of Internal Resistance for Repurposing Using Middle and Large-Sized Batteries

et al. 2023

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The number of used batteries is expected to dramatically increase in the near future due to the expansion of the electric vehicle (EV) market globally. Accordingly, the Korean government has improved the supporting structures for the recycling system for used batteries, and in particular, in the field of repurposing, various studies are being conducted with a focus on effective evaluation methods that can secure the performance and safety of batteries after use. The repurposing of used batteries is mostly adapted in the field of energy storage systems for normally used EV batteries and a total inspection before repurposing is required due to battery characteristics that can vary depending on the operational environments of and accidents involving medium- and large-sized batteries for EVs and energy storage systems (ESSs) that have been occurring continuously for the past few years. Therefore, this paper investigates the operating mechanisms of the internal resistance test method and implements a test device for middle- and large-sized cells and packs. Based on the proposed test method, the internal resistance of nickel manganese cobalt (NMC)-type commercial large batteries is analyzed according to the SOC (state of charge), SOH (state of health), ambient temperature, and connection degradation of batteries. The distribution degrees of the alternative current (AC) internal resistance (IR) and direct current (DC) internal resistance (IR) measurement methods under state of health (SOH) test conditions are about 7% and 50%. It was found that the DC IR measurement method is more effective in diagnosing battery cell degradation. The distribution degree of DC IR measurements for the degraded connection condition shows an increase of less than 1% regardless of the state of charge (SOC), while the distribution degree of the AC IR measurements shows an increase of up to 319%, indicating that the AC IR method is more effective than the DC IR method in identifying connection degradation. It is confirmed that the proposed method is effective in internal resistance measurement and safety evaluations for the repurposing of batteries.

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Characteristics of External Short-Circuit in Li-ion Battery Considering Operation and Environment Factors

Cited by 2 publications

References 0 publications

Safety Assessment for External Short Circuit of Li-Ion Battery in ESS Application Based on Operation and Environment Factors

Safety Assessment for External Short Circuit of Li-Ion Battery in ESS Application Based on Operation and Environment Factors

Evaluation Method of Internal Resistance for Repurposing Using Middle and Large-Sized Batteries

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