In an EV battery cell contacting system (CCS), maintaining continuous use temperatures within safe limits plays a critical role in preserving the structural and electrical integrity of the battery modules. Effective thermal management profiling protects the system by efficiently dissipating heat and preventing overheating during high-load operations and rapid charging cycles.
If thermal limits are exceeded, current collectors can undergo dissolution and corrosion during electrochemical cycling. This degradation leads to severe risks, including the limiting of battery power, a reduction in normal battery operation due to reduced lithium-ion mobility and electrical conductivity, and an overall loss of battery cell capacity.
What Are the Typical Temperature Limits for CCS Dielectrics?
The maximum dielectric continuous use temperature for CCS insulation is typically rated at <220°C. Flexible die-cut circuits provide two substrate options: polyimide (PI) and polyethylene terephthalate (PET). PI has excellent flexibility, tensile strength, thermal conductivity, and chemical resistance.
How Do Insulation Materials Maintain Dielectric Strength Under Heat?
For EV battery cell contacting systems, the dielectric strength of insulation materials is rated to maintain <7.5kV/0.025mm in accordance with ASTM D149 standards. High-quality insulation materials act as a physical wall that prevents the positive and negative electrodes from touching, which stops internal short circuits and electrical arcing even as temperatures fluctuate.
Materials such as PET, PI, and PEN are chosen specifically for their ability to withstand thermal stress without losing their insulating properties, offering high chemical and moisture resistance alongside reliable temperature stability.
What Are the Consequences of Insulation Degradation from Extreme Heat?
Excessive heat can cause physical degradation, leading to the dissolution and corrosion of the current collector and dielectric layers over time. Material failure triggers severe safety hazards; unmanaged heat can cause thermal runaway, a dangerous chain reaction that leads to fires.
Current collectors have been found to undergo dissolution and corrosion in the course of electrochemical cycling. Battery safety can be impacted by current collector degradation, which may lead to short circuits, sudden increase in temperature, and potential catastrophic failure.
Balancing High Power with Material Stability
The typical value range for the dielectric continuous use temperature is <220°C.
Contact our technical team today to access detailed technical specifications and select the right insulation for your high-power battery module.