TY  - CHAP
A1  - Löchte, Andre
A1  - Gebert, Ole
A1  - Glösekötter, Peter
T1  - End of charge detection of batteries with high production tolerances
T2  - Proceedings ITISE-2019. Granada, 25th-27th September 2019
N2  - When developing new battery technologies, fundamental research means assembling new batteries by hand  since  a  production  line  is  not  worthwhile  for  building  and  testing  individual  cells.  This  causes  high  production tolerances to occur because manual manufacturing is not as precise as machine-made. When putting these prototypes into operation, problems can arise due to the varying parameters. One of the most important exercise is finding a criterion of a full battery. This can be challenging when parameters like the capacity or the end  of  charge  voltage  are  not  precisely  known  due  to  the  tolerances.  Furthermore,  new  battery  types  do  not  necessarily rely on the same stopping criteria. For example zinc-air secondary batteries do not offer an end of charging voltage. Its charging current is not going to decrease when the battery is full and the charging voltage is held at a fixed value. But instead of de-oxidising zinc oxide, hydrogen is produced. In the majority of cases overcharging  should  be  avoided  as  it  harms  the  battery.  Another  even  more  dangerous  consequence  is  the  possibility of an explosion. Especially lithium based batteries are known for their need of compatible ambient and charging parameters. This paper proposes a new criterion for detecting the end of charge that is based on the  rate  of  change  of  electrochemical  impedance  spectra  of  the  examined  batteries.  Device  parameter fluctuations  influence  every  measurement.  Therefore,  using  the  rate  of  change  offers  the  possibility  to  not  depend on these fluctuations.
KW  - End of charge
Y1  - 2019
SN  - 978-84-17970-78-9
SP  - 554
EP  - 559
CY  - Granada (Spain)
ER  -