Battery Tester
Author
Valentin, Christian
Term
4. term
Education
Publication year
2019
Submitted on
2019-05-31
Abstract
Growing electrification in transport and energy increases the need for battery diagnostics and accelerated lifetime testing of lithium-ion batteries, especially in new applications with limited prior data. This thesis aims to design and validate a test system to verify the reliability of lithium-ion cells under pulsed charge and discharge conditions. Based on specifications provided by KK Wind Solutions, different converter topologies were examined through calculations and simulations, after which the most promising candidate was built as a prototype. The selected approach is a configuration of multiple H-bridges with an intelligent current control scheme, enabling simultaneous testing of multiple cells. Systematic prototype testing showed close alignment with the given specifications and indicates strong potential. At the same time, issues requiring improvement were identified before a final verdict can be made, including closed-loop control implementation, DSP code optimization, and system configuration refinements. Overall, the work suggests the proposed solution can form the basis of a reliable system for mapping and predicting battery performance and lifetime, while further studies are needed.
Den øgede elektrificering af transport- og energisektoren skaber et behov for bedre batteridiagnostik og accelererede levetidstests af lithium-ion batterier, især i nye anvendelser med begrænset erfaringsgrundlag. Denne afhandling har til formål at designe og validere et testsystem, der kan verificere pålideligheden af lithium-ion celler under pulserede lade- og afladebetingelser. Med udgangspunkt i specifikationer leveret af KK Wind Solutions blev forskellige omformer-topologier analyseret gennem beregninger og simuleringer; herefter blev den mest lovende løsning realiseret som en prototype. Kandidaten er en konfiguration af flere H-broer med intelligent strømstyring, der muliggør samtidig test af flere celler. Systematiske prototypetests viste høj overensstemmelse med de givne specifikationer og indikerer et betydeligt potentiale. Samtidig blev der identificeret forhold, som bør forbedres før endelig konklusion kan drages, herunder implementering af lukket kredsløbsregulering, optimering af DSP-kode og justering af systemkonfiguration. Samlet peger arbejdet på, at den foreslåede løsning kan danne grundlag for et pålideligt testsystem til kortlægning og forudsigelse af batteriers ydeevne og levetid, men yderligere undersøgelser er nødvendige.
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