New Technology InsightsLaminate film cooler
Li-ion batteries (LIBs) for use in electric vehicles（EVs）have been required both to enhance the energy density in order to extend traveling range, and low temperature control to achieve high output and long life.
We are focused on technologies of our aluminum（Al）laminate film SPALF™, in which Al foil is sandwiched between resin films. SPALF™ has been used for packaging material for LIBs for EVs, so we develops thin and light-weight battery cooling system that have high efficiency and high safety required in the market.
What is “Laminate film cooler”?
A new cooling device applied the packaging materials of pouch type Li-ion batteries SPALF™ as materials for the heat exchanger. Since SPALF™ has electrical insulation and corrosion-resistant properties as Al-resin composite materials, SDK can design compact and light-weighted heat exchanger.
- Ultra-thin and light-weighted heat exchanger can be made
- Good process ability due to low temperature bonding（heat sealing process）
- SPALF™ has both of high thermal conductivity and excellent corrosion resistance
Comparison properties among heat exchangers
|Products||Extruded heat exchanger||Brazed heat exchanger||Laminate film cooler|
|Constitution material||AL Extrusion||AL plate||AL laminated film (SPALF™)|
|Bonding process||Welding||Brazing||Heat sealing|
Data represents experimental results and does not guarantee specific performance levels under actual usage.
Structure and constitution of materials
Form water-passage to join outer wall and fin by heat seal process
Structure overview of SPALF™, AL-laminated film
Typical material configuration of SPALF™
|Total Thickness||Density||Component Material||Component Thickness|
|Bonding strength of
|>40N/15mm||Pealing strength of SPALF™ - SPALF™.|
|Withstand voltage||>6kV||Qualified insulated performance as battery package.|
|Tensile strength (Break)||68~87MPa||Measuring method : ISO527-31995|
|Tensile Elongation||26 ~ 38%||Measuring method : ISO527-31995|
|Coolant resistance||>50℃ × 1300h||Testing result of water base coolant.|
|CTE||≒23ppm/K||Equivalent with AL.|
Case study of application for battery cooling system
SDK can support customized and optimized design development along with customers’ unique requirements.