Pulzno polnjenje litij-ionskih baterij

diplomsko delo

Filip Borovšak (Author), Matjaž Krajnc (Mentor)

Abstract

Litij-ionske baterije so od svojih prvih komercialnih aplikacij ob koncu 20. stoletja postale pogoste v velikem številu elektronskih naprav kot so prenosniki in pametni telefoni. Razviti so bili različni tipi baterijskih celic, kot so LCO, LMO, NMC, NCA, LFP in Li-Po celice, ki so zaradi svojih fizikalnih lastnosti primerni za določene aplikacije. Vzporedno z razvojem litij-ionskih baterij se je pojavila tudi potreba po boljših algoritmih za njihovo polnjenje, ki med drugim omogočajo hitrejše polnjenje in zmanjšajo degradacijo baterije skozi njeno obratovalno dobo. Med alternativnimi algoritmi polnjenja litij-ionskih baterij je nekaj pozornosti v literaturi dobila tudi družina algoritmov pulznega polnjenja, ki bi lahko rešila nekatere potrebe polnjenja baterij. Veja industrije, ki trenutno še posebej investira v nove tehnike polnjenja in razvoj litij-ionskih baterij, je industrija električnih vozil. Glavni skrbi potrošnikov sta doseg vozila, ki je vezan na kapaciteto baterije in programsko opremo vozila, in hitrost polnjenja, ki je vezana na tip baterije, algoritem polnjenja in kontrolno enoto baterijskega sistema. To diplomsko delo obravnava pulzno polnjenje kot alternativo standardnemu CC-CV polnjenju litij-ionskih baterij za LFP celico. Ta tip celice postaja vedno pogostejši v baterijskih sistemih električnih vozil, zato je v delu izbrana komercialno dostopna baterijska celica večje kapacitete. Glavni del diplomskega dela se ukvarja s problematiko določanja parametrov pulznega polnjenja na podlagi eksperimenta in simulacije. Predstavljene so tehnike, ki so pogosteje omenjene v literaturi, kot tudi prednosti ter slabosti obeh načinov določanja optimalnih parametrov. Nato so na podlagi prejšnjih raziskav določeni najboljši algoritmi za pulzno polnjenje in njihovi parametri. Za zmanjšanje degradacije baterije je najboljša občasna uporaba APC, CC-CVNP ali ASRC algoritma frekvence pod 1 Hz.

Keywords

litij-ionske baterije;polnjenje baterij;pulzno polnjenje;litijev železov fosfat;LFP;električna vozila;diplomska dela;

Data

Language:	Slovenian
Year of publishing:	2022
Typology:	2.11 - Undergraduate Thesis
Organization:	UL FKKT - Faculty of Chemistry and Chemical Technology
Publisher:	[F. Borovšak]
UDC:	621.355(043.2)
COBISS:	124461315
Views:	25
Downloads:	6
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Pulse charging lithium-ion batteries
Secondary abstract:	From their first commercial applications at the end of the 20th century lithium-ion batteries have become common in many electronic devices such as laptops and smartphones. Different battery cell types were developed such as LCO, LMO, NMC, NCA and Li-Po cells, that are suitable for specific applications, because of their different physical properties. In parallel to the development of lithium-ion batteries a need for better charging algorithms emerged, that among other things enable faster charging and reduce battery degradation over the operation period of the battery. Amongst alternative charging algorithms for lithium-ion batteries the family of pulse charging algorithms received some attention in the literature and could save some of the needs of battery charging. The branch of industry, that especially invests in new techniques of charging and the development of lithium-ion batteries, is electric vehicle industry. The main concerns of consumers are vehicle range, that is linked to the battery type and software, and charging speed, that is linked to the charging algorithm and battery management system. This Bachelors Thesis discusses pulse charging as an alternative to the standard CC-CV charging algorithm of lithium-ion batteries for a LFP cell. This cell type is becoming more common in electric vehicle battery systems, so in this work an example of a commercially accessible higher capacity battery cell was chosen. The main part of the Thesis discusses the problematics of determining the optimal parameters for pulse charging based on an experiment and a simulation. The techniques, most mentioned in the literature, are presented, as well as pros and cons of both ways of determining the optimal parameters. Afterwards, the best algorithms for pulse charging and their parameters are determined based on previous research. The occasional use of APC, CC-CVNP or ASRC algorithm with frequency below 1 Hz is best for lessening battery degradation.
Secondary keywords:	pulse charging;lithium-ion battery;LFP;electric vehicles;Litijeve baterije;Univerzitetna in visokošolska dela;
Type (COBISS):	Bachelor thesis/paper
Study programme:	1000372
Embargo end date (OpenAIRE):	1970-01-01
Thesis comment:	Univ. v Ljubljani, Fak. za kemijo in kemijsko tehnologijo, UNI Kemijsko inženirstvo
Pages:	32 str.
ID:	16336549