Impact analysis of cell assembly and measurement point in Li-ion battery packs

Name: Jedsada Tangmongkhonsuk.

keyword: Battery management system.

LCSH: Lithium ion batteries.

; Spot welding.

; Battery pack.

Abstract: This study examines the impact of cell assembly and measurement location on the performance and longevity of low-voltage Li-ion battery packs, specifically focusing on 18650 lithium-ion cells. Three critical aspects were analyzed: terminal placement, spot welding quality, and BMS measurement location. The research aims to optimize battery pack design, enhance production quality control, and improve overall efficiency. Terminal placement analysis revealed that symmetrical vertically-aligned terminals and connections to all strings provided optimal performance. Even-numbered cell strings require fewer electrical wires, reducing weight and cost, while odd-numbered cell strings need more wiring for best performance. Spot welding quality demonstrated the importance of consistent weld resistance across all battery cells. Batteries with lower internal resistance are more sensitive to weld quality variations, resulting in greater voltage and current differences. Ensuring high weld quality is crucial for maintaining battery performance and reducing deterioration. The impact of BMS measurement location was assessed, finding that the most effective measurement points are those closest to the cells with the highest voltage. Poor welding quality distorts measurement accuracy, highlighting the need for precise welding for reliable battery management. Optimal BMS measurement locations enhance safety and efficiency, particularly in configurations with consistent welding quality. These findings provide valuable insights for optimizing battery pack configurations, improving production processes, and developing highperformance, durable lithium-ion battery packs for various industrial applications.

King Mongkut's University of Technology North Bangkok. Central Library

Address: BANGKOK

Email: library@kmutnb.ac.th

Name: Nisai Fuengwarodsakul

Role: thesis advisor.

Email : nisai.f@tggs.kmutnb.ac.th

Name: Manop Masomtob

Role: thesis advisor.

Name: Burin Kerdsup

Role: thesis advisor.

Created: 2023

Modified: 2567-12-16

Issued: 2024-12-16

วิทยานิพนธ์/Thesis

application/pdf

eng

DegreeName: Master of Engineering

Level: Master's Degree

Descipline: Electrical and Computer Engineering (International Program)

Grantor: King Mongkut's University of Technology North Bangkok

©copyrights King Mongkut's University of Technology North Bangkok

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