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Failure Prediction of NiMH Batteries

Hägnefelt, Markus LU and Dahlberg, Filip LU (2018) In CODEN:LUTEDX/TEIE EIEM01 20172
Industrial Electrical Engineering and Automation
Abstract
This master thesis has been carried out to investigate the possibility
to predict battery failure of Nickel-Metal Hydride (NiMH) batteries.
Assa Abloy use these batteries as a back-up in their door solution systems
in case there is a power loss. The main function is to be able to open doors that are part of an emergency exit route. Thus, approximately 200 battery packs were used to collect data regarding mainly their internal resistance, capacity and age counted from production date. These parameters were then mapped to how many consecutive door openings they could perform at different temperatures before failure. The study showed that the internal resistance of the battery has a great impact on its performance. The temperature also has... (More)
This master thesis has been carried out to investigate the possibility
to predict battery failure of Nickel-Metal Hydride (NiMH) batteries.
Assa Abloy use these batteries as a back-up in their door solution systems
in case there is a power loss. The main function is to be able to open doors that are part of an emergency exit route. Thus, approximately 200 battery packs were used to collect data regarding mainly their internal resistance, capacity and age counted from production date. These parameters were then mapped to how many consecutive door openings they could perform at different temperatures before failure. The study showed that the internal resistance of the battery has a great impact on its performance. The temperature also has a big effect because the internal resistance varies with temperature. At a late stage of the master thesis, it was seen that the open circuit voltage during charge was affected by the temperature. However, more investigation regarding this needs to be done. Furthermore, the capacity does not seem to have a notable impact and neither does the age. The key to predict battery failure is to have knowledge regarding how the internal resistance changes over time as well as how it changes with temperature. Some insight regarding this has been discovered during the study but further investigation needs to be done. (Less)
Popular Abstract (Swedish)
Utvecklingen går snabbt framåt och att vara ständigt uppkopplad har under många år varit vardag för människan. Men med ny teknik kommer nya möjligheter och det är nu även dags för industrin att koppla upp sig, vad som ofta benämns som den fjärde industriella revolutionen eller industri 4.0. På Assa Abloy vill man nu undersöka vilka möjligheter som finns med den nya tekniken och ett examensarbete med fokus på att prediktera när batterierna i deras dörrar behöver bytas startades.
Please use this url to cite or link to this publication:
author
Hägnefelt, Markus LU and Dahlberg, Filip LU
supervisor
organization
course
EIEM01 20172
year
type
H3 - Professional qualifications (4 Years - )
subject
publication/series
CODEN:LUTEDX/TEIE
report number
5407
other publication id
CODEN:LUTEDX/(TEIE-5407)/1-62(2018)
language
English
id
8952766
alternative location
http://www.iea.lth.se/publications/MS-Theses/Full%20document/5407_full_document.pdf
date added to LUP
2019-03-29 14:12:47
date last changed
2019-03-29 14:12:47
@misc{8952766,
  abstract     = {{This master thesis has been carried out to investigate the possibility
to predict battery failure of Nickel-Metal Hydride (NiMH) batteries.
Assa Abloy use these batteries as a back-up in their door solution systems
in case there is a power loss. The main function is to be able to open doors that are part of an emergency exit route. Thus, approximately 200 battery packs were used to collect data regarding mainly their internal resistance, capacity and age counted from production date. These parameters were then mapped to how many consecutive door openings they could perform at different temperatures before failure. The study showed that the internal resistance of the battery has a great impact on its performance. The temperature also has a big effect because the internal resistance varies with temperature. At a late stage of the master thesis, it was seen that the open circuit voltage during charge was affected by the temperature. However, more investigation regarding this needs to be done. Furthermore, the capacity does not seem to have a notable impact and neither does the age. The key to predict battery failure is to have knowledge regarding how the internal resistance changes over time as well as how it changes with temperature. Some insight regarding this has been discovered during the study but further investigation needs to be done.}},
  author       = {{Hägnefelt, Markus and Dahlberg, Filip}},
  language     = {{eng}},
  note         = {{Student Paper}},
  series       = {{CODEN:LUTEDX/TEIE}},
  title        = {{Failure Prediction of NiMH Batteries}},
  year         = {{2018}},
}