Influence of interconnect resistances on parallel-connected LiFePO<sub>4</sub> cells performance

Chang, Long; Duan, Bin; Zhang, Kang; Zhang, Chenghui; Xiao, Linjing

doi:10.1109/cvci47823.2019.8951721

Cited by 3 publications

(4 citation statements)

References 18 publications

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“…Furthermore, parasitic power is required to run the auxiliary systems of the car, such as lights, air-conditioning, radio, etc. The total power required by the battery pack is then given by (33).…”

Section: = (30)mentioning

confidence: 99%

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Low Temperature, Current Dependent Battery State Estimation Using Interacting Multiple Model Strategy

Messing

Rahimifard

Shoa³

et al. 2021

IEEE Access

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Lithium-ion battery State of Charge (SoC) estimation for Electric Vehicle (EV) applications must be robust and as accurate as possible to maximize battery utilization and ensure safe operation over a wide range of operating conditions. SoC estimation commonly utilizes filters such as the Extended Kalman Filter (EKF) which rely on battery models, usually in the form of Equivalent Circuit Models (ECM). At low temperatures the battery response to current draw becomes increasingly non-linear, resulting in amplified SoC estimation errors. In this study, current dependent SoC estimation at low temperature is proposed using an Interacting Multiple Model (IMM) filter with three ECMs covering a range of C-rates. The IMM is combined with the Smooth Variable Structure Filter (SVSF) to obtain robust SoC estimates within a SoC estimation error of 2%.

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Section: = (30)mentioning

confidence: 99%

“…This is valid under the assumption that the cells are similar enough in their characteristics. Improvements can be made to ECMs to include resistances of interconnects [33] and those models can then be used with the IMM-SVSF.…”

Section: Imm Voltage Modeling and Mode Probabilitiesmentioning

confidence: 99%

Low Temperature, Current Dependent Battery State Estimation Using Interacting Multiple Model Strategy

Messing

Rahimifard

Shoa³

et al. 2021

IEEE Access

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show abstract

“…In addition, they also found that at higher load current and connected resistance, the difference in discharge depth between the cells became more significant, and the temperature gradient increased in the parallel pack, which may cause safety issues [23,24]. Therefore, Chang et al indicated that the connected resistance was as small as possible and that the module collector was not connected to the edge cell, which could reduce the inhomogeneous current [25]. Li et al investigated that decreasing connected resistance between the cells mitigated inhomogeneous temperature and reduced inhomogeneous current [26].…”

Section: Introductionmentioning

confidence: 99%

Impact of Multiple Module Collectors on the Cell Current Distribution within the Battery Pack

Yu,

Sun,

Chang

et al. 2023

Batteries

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Lithium-ion batteries are usually connected in series and parallel to form a pack for meeting the voltage and capacity requirements of energy storage systems. However, different pack configurations and battery module collector positions result in different equivalent connected resistances, leading to pack current inhomogeneity, which seriously reduces the lifetime and safety of the pack. Therefore, in order to quantitatively analyze the influence of the connected resistance on the current distribution, this study researched the initial cell current distribution of the parallel module by developing mathematical models of different configurations. Then, this study explored the influence of multiple module collector positions on the current inhomogeneity of the pack under the dynamic current condition. The results show that the inhomogeneity of cell current and discharge capacity in the pack with parallel modules connected in series can be improved by keeping each cell in a parallel module with the same distance to its module collector. Furthermore, the current homogeneity of the edge parallel modules in the pack is seriously affected by the position of the single module collector. Therefore, this study innovatively proposes the symmetrical multiple module collectors of the pack, which can greatly improve the current homogeneity of the edge parallel modules, thereby improving the lifetime and safety of the pack.

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“…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 interconnect resistances on parallel-connected LiFePO₄ cells performance

Cited by 3 publications

References 18 publications

Low Temperature, Current Dependent Battery State Estimation Using Interacting Multiple Model Strategy

Low Temperature, Current Dependent Battery State Estimation Using Interacting Multiple Model Strategy

Impact of Multiple Module Collectors on the Cell Current Distribution within the Battery Pack

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

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Influence of interconnect resistances on parallel-connected LiFePO4 cells performance

Cited by 3 publications

References 18 publications

Low Temperature, Current Dependent Battery State Estimation Using Interacting Multiple Model Strategy

Low Temperature, Current Dependent Battery State Estimation Using Interacting Multiple Model Strategy

Impact of Multiple Module Collectors on the Cell Current Distribution within the Battery Pack

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

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Product

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Influence of interconnect resistances on parallel-connected LiFePO₄ cells performance