Study of the Characteristics of Battery Packs in Electric Vehicles With Parallel-Connected Lithium-Ion Battery Cells

Automotive battery packs for electric vehicles (EV), hybrid electric vehicles (HEV), and plug-in hybrid electric vehicles (PHEV) typically consist of a large number of battery cells. These cells must be assembled together with robust mechanical and electrical joints. Joining of battery cells presents several challenges such as welding of highly conductive and dissimilar materials, multiple sheets joining, and varying material thickness combinations. In addition, different cell types and pack configurations have implications for battery joining methods. This paper provides a comprehensive review of joining technologies and processes for automotive lithium-ion battery manufacturing. It details the advantages and disadvantages of the joining technologies as related to battery manufacturing, including resistance welding, laser welding, ultrasonic welding and mechanical joining, and discusses corresponding manufacturing issues. Joining processes for electrode-to-tab, tab-to-tab (tab-to-bus bar), and module-to-module assembly are discussed with respect to cell types and pack configuration.

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Study of the characteristics of battery packs in electric vehicles with parallel-connected lithium-ion battery cells

2014 IEEE Applied Power Electronics Conference and Exposition - APEC 2014 ◽

10.1109/apec.2014.6803766 ◽

2014 ◽

Cited By ~ 9

Author(s):

Xianzhi Gong ◽

Rui Xiong ◽

Chunting Chris Mi

Keyword(s):

Lithium Ion Battery ◽

Electric Vehicles ◽

Lithium Ion ◽

Battery Packs ◽

Battery Cells

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Characterization of the Compressive Load on a Lithium-Ion Battery for Electric Vehicle Application

Machines ◽

10.3390/machines9040071 ◽

2021 ◽

Vol 9 (4) ◽

pp. 71

Author(s):

Seyed Saeed Madani ◽

Erik Schaltz ◽

Søren Knudsen Kær

Keyword(s):

Electrochemical Impedance Spectroscopy ◽

Impedance Spectroscopy ◽

Lithium Ion Batteries ◽

Lithium Ion Battery ◽

Electric Vehicles ◽

Large Scale ◽

Electrochemical Impedance ◽

Applied Pressure ◽

Lithium Ion ◽

Battery Cells

Lithium-ion batteries are being implemented in different large-scale applications, including aerospace and electric vehicles. For these utilizations, it is essential to improve battery cells with a great life cycle because a battery substitute is costly. For their implementation in real applications, lithium-ion battery cells undergo extension during the course of discharging and charging. To avoid disconnection among battery pack ingredients and deformity during cycling, compacting force is exerted to battery packs in electric vehicles. This research used a mechanical design feature that can address these issues. This investigation exhibits a comprehensive description of the experimental setup that can be used for battery testing under pressure to consider lithium-ion batteries’ safety, which could be employed in electrified transportation. Besides, this investigation strives to demonstrate how exterior force affects a lithium-ion battery cell’s performance and behavior corresponding to static exterior force by monitoring the applied pressure at the dissimilar state of charge. Electrochemical impedance spectroscopy was used as the primary technique for this research. It was concluded that the profiles of the achieved spectrums from the experiments seem entirely dissimilar in comparison with the cases without external pressure. By employing electrochemical impedance spectroscopy, it was noticed that the pure ohmic resistance, which is related to ion transport resistance of the separator, could substantially result in the corresponding resistance increase.

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