Influence of circuit design on load distribution and performance of parallel-connected Lithium ion cells for photovoltaic home storage systems

Grün, Thorsten; Stella, Kevin; Wollersheim, Olaf

doi:10.1016/j.est.2018.03.010

Cited by 26 publications

(11 citation statements)

References 18 publications

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“…The model considers the mentioned resistances due to the connection of the cells to the cell tester and the parallel-connection of L cell layers within the lithium-ion cell. ECMs with RC-pairs are widely used for the simulation of the current distribution within parallel-connected cells [1,2,[40][41][42][43].…”

Section: Equivalent Circuit Modelmentioning

confidence: 99%

Battery Management Systems of Electric and Hybrid Electric Vehicles

2021

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Section: Equivalent Circuit Modelmentioning

confidence: 99%

Battery Management Systems of Electric and Hybrid Electric Vehicles

2021

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Section: Equivalent Circuit Modelmentioning

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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“…The ratio of connector resistance to the internal resistance of a cell has an important influence on the inhomogeneous cell current within the parallel battery pack Grün et al, 2018;Lv et al, 2019). Further, Hosseinzadeh et al (Hosseinzadeh et al, 2021) found that compared to cell internal resistance, capacity, and temperature, the ratio of connector resistance to cell internal resistance had the biggest influence on the performance of the parallel battery module.…”

Section: Introductionmentioning

confidence: 99%

“…Then, the series-parallel battery pack can be formed by connecting parallel modules in series. Meanwhile, nickel plates are widely used in the assembly of series-parallel battery packs due to their corrosion resistance, high mechanical stability, and good weld ability (Brand et al, 2015;Grün et al, 2018;Chang et al, 2019). There are two typical series assembly methods for parallel modules connected by nickel plates, which are defined in this paper.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Assembly Method on the Cell Current Distribution of Series–Parallel Battery Packs Based on Connector Resistance

Chang

Luan

et al. 2022

Front. Energy Res.

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In order to meet the energy and power requirements of large-scale battery applications, lithium-ion batteries have to be connected in series and parallel to form various battery packs. However, unavoidable connector resistances cause the inconsistency of the cell current and state of charge (SoC) within packs. Meanwhile, different assembly methods and module collector positions (MCPs) may result in different connector resistance arrangements, thereby leading to different cell current distributions. Therefore, the correlation of connector resistance to battery pack performance is worth investigating. Based on the simplified equivalent circuit model (ECM), the mathematical models of cell current distribution within packs under different assembly methods are obtained in this paper. Then, we use COMSOL Multiphysics simulation to analyze the guidelines of series assembly for parallel modules and then study the influences of connector resistance and MCP on series–parallel battery packs. The results show that the assembly method with an equal distance between each cell and the assembly contact surface for series assembly can effectively reduce the inhomogeneous current. However, the cell current and SoC distribution within the series–parallel battery pack is completely independent of the Z-configuration and ladder configuration. In addition, for series–parallel battery packs, the non-edge parallel module part of the series–parallel battery pack can be replaced with a series cell module (SCM) structure. Finally, the influences of the value of the connector resistance and current rate on the cell current distribution are discussed.

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Influence of circuit design on load distribution and performance of parallel-connected Lithium ion cells for photovoltaic home storage systems

Cited by 26 publications

References 18 publications

Battery Management Systems of Electric and Hybrid Electric Vehicles

Battery Management Systems of Electric and Hybrid Electric Vehicles

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

Influence of the Assembly Method on the Cell Current Distribution of Series–Parallel Battery Packs Based on Connector Resistance

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