Discharge by Short Circuit Currents of Parallel-Connected Lithium-Ion Cells in Thermal Propagation

Koch, Sascha; Fill, Alexander; Kelesiadou, Katerina; Birke, Kai Peter

doi:10.3390/batteries5010018

Cited by 7 publications

(3 citation statements)

References 33 publications

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“…Mao et al [26] revealed the thermal stability and component heat contribution ratio of overcharged lithium-ion batteries during TR and discovered that increasing SOC could decrease the activation energy of exothermic side reactions. Koch et al [27] investigated the TR reaction in pouch batteries at different SOCs, which not only revealed the amount of energy released during a TR reaction but also uncovered that the change in mass (mass lost) after TR is less in batteries with a low SOC than at a higher SOC. Chen et al [28] studied the TR behaviors of nickel-rich li-ion batteries and revealed the TR characteristics under different SOCs.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Effect of State of Charge on Failure Propagation Characteristics within Battery Modules

Rui

et al. 2023

Chin. J. Electr. Eng.

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To investigate the effect of different states of charge(SOC) on the thermal runaway(TR) propagation behaviors within lithium-ion-batteries based energy storage modules, an experimental setup was developed to conduct failure propagation tests on battery modules at an SOC of 97%, 85%, and 50%. The result indicates that an increase in the SOC of batteries can decrease the TR trigger temperature, making batteries trigger TR earlier and reducing the average failure propagation time between two adjacent cells.In addition, the failure propagation tests reveal that at higher SOCs, the TR reaction becomes more violent, the maximal reaction temperature is also much higher, and the damage to the battery module is severe. Compared to the battery module with 97% SOC, the TR trigger time of the battery module with 50% SOC was postponed by approximately 57.8%. Meanwhile, the average failure propagation time got prolonged by approximately 36.0%. Thus, this study can provide references for the thermal safety design of energy-storage battery modules.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on the Effect of State of Charge on Failure Propagation Characteristics within Battery Modules

Rui

et al. 2023

Chin. J. Electr. Eng.

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“…From the results of the research by Lamb et al on 18 650 cylindrical cells and small pouch cells, 30 it can be seen that parallel connection does accelerate or promote the occurrence of thermal propagation. Koch et al 31 showed that the lower the state‐of‐charge (SoC) of the battery, the higher the initial temperature during thermal runaway, and the smaller the mass loss caused by thermal runaway (it is generally considered that the lower the severity of the thermal runaway, the smaller the released energy). Gao et al 32 conducted experiments and simulation studies on prismatic cells, proposed a method to study the Joule heating effect generated by the discharge during thermal runaway in parallel circuits, and further proposed a simulation study by establishing an equivalent circuit model for quantification.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on thermal runaway characteristic parameters of parallel battery modules

Liu

Chang

Yang

et al. 2021

Intl J of Energy Research

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Summary This work introduces a method for measuring the main physical quantities, such as short‐circuit current and capacity loss, in the thermal runaway process of the parallel battery module and presents detailed analysis and discussion on a 25 Ah commercial prismatic lithium‐ion ferrous phosphate (LFP) battery. By establishing a basic circuit model of the thermal runaway process of the parallel battery module, experiments were conducted to observe the thermal runaway process of the parallel battery module. The parameters related to the electrothermal effect in the thermal runaway process were obtained by either direct measurement or calculation. The results showed that the short‐circuit resistance of the cell, which was triggered to thermal runaway changed dramatically. The minimum resistance was about 0.5 mΩ, and the peak current of discharge was more than 1100 A. During the stable discharge process of the other parallel cells to the thermal runaway cell, the short‐circuit resistance was about 10 mΩ. In the stable discharge stage, the electric heating power was about 600 to 900 W. However, the power of thermal runaway reaction from the cell itself was still more than 30 times the heating power of the electrothermal effect, exceeding 21 kW. The accuracy of the measurement method and analysis method was also verified by comparing the same parametric data obtained using different methods. The results showed that the method is feasible for studies on the mechanism and simulation of thermal runaway of parallel battery modules.

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“…There is a variety of articles focusing on modeling [11][12][13][14][15], aging [16][17][18], safety [19][20][21], state estimation [22,23] and measurement [24][25][26] of parallel-connected cells. Mostly qualitative effects like OCV [27], SoC [13], temperature [13,26,28,29] and current differences [13] are demonstrated but quantitative relationships are missing, especially with regard to the thermal connection of the cells to neighboring cells and cooling.…”

Section: Introductionmentioning

confidence: 99%

Measuring Test Bench with Adjustable Thermal Connection of Cells to Their Neighbors and a New Model Approach for Parallel-Connected Cells

et al. 2019

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This article presents a test bench with variable temperature control of the individual cells connected in parallel. This allows to reconstruct arising temperature gradients in a battery module and to investigate their effects on the current distribution. The influence of additional contact resistances induced by the test bench is determined and minimized. The contact resistances are reduced from R Tab + = 81.18 μ Ω to R Tab + = 55.15 μ Ω at the positive respectively from R Tab − = 35.59 μ Ω to R Tab − = 28.2 μ Ω at the negative tab by mechanical and chemical treating. An increase of the contact resistance at the positive tab is prevented by air seal of the contact. The resistance of the load cable must not be arbitrarily small, as the cable is used as a shunt for current measurement. In order to investigate their impacts, measurements with two parallel-connected cells and different load cables with a resistance of R Cab + = 0.3 m Ω , R Cab + = 1.6 m Ω and R Cab + = 4.35 m Ω are conducted. A shift to lower current differences with decreasing cable resistance but qualitatively the same dynamic of the current distribution is found. An extended dual polarization model is introduced, considering the current distribution within the cells as well as the additional resistances induced by the test bench. The model shows a high correspondence to measurements with two parallel-connected cells, with a Root Mean Square Deviation (RMSD) of ξ RMSD = 0.083 A.

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Discharge by Short Circuit Currents of Parallel-Connected Lithium-Ion Cells in Thermal Propagation

Cited by 7 publications

References 33 publications

Experimental Study on the Effect of State of Charge on Failure Propagation Characteristics within Battery Modules

Experimental Study on the Effect of State of Charge on Failure Propagation Characteristics within Battery Modules

Experimental study on thermal runaway characteristic parameters of parallel battery modules

Measuring Test Bench with Adjustable Thermal Connection of Cells to Their Neighbors and a New Model Approach for Parallel-Connected Cells

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