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LUND UNIVERSITY LIBRARIES

Evaluation of welding joint methods for a prismatic battery cell module

Hellingwerf, William LU (2021) MMKM10 20202
Product Development
Abstract
Prismatic battery cells swell due to a number of different factors, such as state
of charge, temperature and irreversibly with charge cycling. Cell health can
be improved by restricting the swelling of the cell, and therefore, the container
which holds the cells, the module, should be able to restrict the swelling, and
thus withstand the force exerted by the cells.
This paper evaluates the use of three different welding techniques to use with
a specified module frame constructed out of aluminium. The welding of the
module will be performed with the cells in place and as of safety reasons to
avoid the devastating effects of a thermal runaway, a maximum temperature
requirement is set on the cell side of the welded parts.
The three... (More)
Prismatic battery cells swell due to a number of different factors, such as state
of charge, temperature and irreversibly with charge cycling. Cell health can
be improved by restricting the swelling of the cell, and therefore, the container
which holds the cells, the module, should be able to restrict the swelling, and
thus withstand the force exerted by the cells.
This paper evaluates the use of three different welding techniques to use with
a specified module frame constructed out of aluminium. The welding of the
module will be performed with the cells in place and as of safety reasons to
avoid the devastating effects of a thermal runaway, a maximum temperature
requirement is set on the cell side of the welded parts.
The three welding techniques evaluated in this report are, tungsten inert gas,
friction stir, and laser welding. Which are evaluated on a basis of strength
and maximum temperature development during the welding process.
This paper focuses on comparing the three different methods relative each
other. Calculations and simulations should not in any way be considered
accurate or be used for dimensioning without extensive validation.
The most promising welding method in this report is laser welding, as the
research points toward a significant safety factor towards the maximum allowed
temperatures on the cells. However, the strength requirement is not met with
the use of the same alloys as suggested with the other techniques, but is
promising with the use of alternative alloys. (Less)
Abstract (Swedish)
Prismatiska battericeller sväller på grund av ett antal olika faktorer, såsom
laddningstillstånd och temperatur, men också irreversibelt med laddningscykling.
Cellhälsan kan förbättras genom att begränsa svällnad av cellen, och
därmed bör konstruktionen som håller cellerna på plats, modulen, kunna begränsa
svullnaden och därmed motstå det lastfall som skapas av cellsvällnaden.
Denna uppsats utvärderar användandet av tre olika svetstekniker, med avsikt
att användas för att konstruera en batterimodulsram i aluminium för prismatiska
celler. Svetsning av modulen sker med cellerna på plats. Därför,
av säkerhetsskäl för att undvika att värma upp cellerna till farligt höga temperaturer,
ställs ett krav på den maximala temperaturen som... (More)
Prismatiska battericeller sväller på grund av ett antal olika faktorer, såsom
laddningstillstånd och temperatur, men också irreversibelt med laddningscykling.
Cellhälsan kan förbättras genom att begränsa svällnad av cellen, och
därmed bör konstruktionen som håller cellerna på plats, modulen, kunna begränsa
svullnaden och därmed motstå det lastfall som skapas av cellsvällnaden.
Denna uppsats utvärderar användandet av tre olika svetstekniker, med avsikt
att användas för att konstruera en batterimodulsram i aluminium för prismatiska
celler. Svetsning av modulen sker med cellerna på plats. Därför,
av säkerhetsskäl för att undvika att värma upp cellerna till farligt höga temperaturer,
ställs ett krav på den maximala temperaturen som mäts upp på
cellsidan.
De tre svetsmetoder som utvärderas i denna rapport är TIG svetsning, friktionsrörssvetsning
och lasersvetsning. Dessa utvärderas utifrån styrka och maximal
temperaturutveckling under svetsprocessen.
Denna uppsats fokuserar på att jämföra de tre olika metoderna relativt verandra.
Beräkningar och simuleringar bör inte anses vara sanningsenliga eller
användas för dimensionering utan omfattande validering.
Den mest lovande svetsmetoden i denna rapport är lasersvetsning, då resultaten
i rapporten pekar mot en signifikant säkerhetsfaktor mot de maximalt
tillåtna temperaturerna på cellerna. Däremot uppfylls inte hållfasthetskravet
med samma legeringar som föreslagits för de andra metoderna. Däremot kan
användandet av andra legeringar öka svetsens hållfasthet. (Less)
Please use this url to cite or link to this publication:
author
Hellingwerf, William LU
supervisor
organization
course
MMKM10 20202
year
type
H2 - Master's Degree (Two Years)
subject
keywords
Aluminium welding methods, Battery module, Prismatic cell, Weld strength, Weld analysis, Weld temperature simulation
language
English
id
9039110
date added to LUP
2021-02-02 11:26:13
date last changed
2021-02-02 11:26:13
@misc{9039110,
  abstract     = {{Prismatic battery cells swell due to a number of different factors, such as state
of charge, temperature and irreversibly with charge cycling. Cell health can
be improved by restricting the swelling of the cell, and therefore, the container
which holds the cells, the module, should be able to restrict the swelling, and
thus withstand the force exerted by the cells.
This paper evaluates the use of three different welding techniques to use with
a specified module frame constructed out of aluminium. The welding of the
module will be performed with the cells in place and as of safety reasons to
avoid the devastating effects of a thermal runaway, a maximum temperature
requirement is set on the cell side of the welded parts.
The three welding techniques evaluated in this report are, tungsten inert gas,
friction stir, and laser welding. Which are evaluated on a basis of strength
and maximum temperature development during the welding process.
This paper focuses on comparing the three different methods relative each
other. Calculations and simulations should not in any way be considered
accurate or be used for dimensioning without extensive validation.
The most promising welding method in this report is laser welding, as the
research points toward a significant safety factor towards the maximum allowed
temperatures on the cells. However, the strength requirement is not met with
the use of the same alloys as suggested with the other techniques, but is
promising with the use of alternative alloys.}},
  author       = {{Hellingwerf, William}},
  language     = {{eng}},
  note         = {{Student Paper}},
  title        = {{Evaluation of welding joint methods for a prismatic battery cell module}},
  year         = {{2021}},
}