In electric and hybrid vehicles, the key enabling component is the battery pack, which stores electricity in the form of a chemical reaction and converts the reaction back to electricity. Multiple battery cells constitute a module, and multiple modules constitute a pack. Higher power density and lower cost lithium battery systems have transformed the way that we can store and use power on board a vehicle.
Lithium-ion (Li-ion) battery packs remain the major power source for the EV industry. However, these batteries have relatively short operating lives and degrade quickly with age, especially in the challenging automotive environments. This is because an EV needs to be recharged more often than a gasoline vehicle. Each recharge cycle reduces the overall capacitance of the battery, shortening the battery lifespan. Additionally, recharging causes a slight expansion of the physical dimensions of the battery cells, which can cause delamination of the internal battery cells and components or even battery pack deformation. This can prevent effective thermal management, further endangering the battery lifespan, and in worse case scenarios leading to thermal runaway.
To become more competitive over conventional fuel automobiles, electric vehicle (EV) battery technology mainly focuses on making breakthrough on:
- Higher power density and energy density
- High-volume, cost-efficient manufacturing
- Safety and long-term reliability
Thermal management in EVs, ensuring batteries do not overheat, is a critical focus for vehicle safety and lifetime battery performance. Honeywell thermal interface materials could make thermal management more efficient to face the significant thermal challenge of higher power large format Li-ion batteries . A wide range choice of liquid and pad-based materials provides optimized thermal control in formulations to meet high-volume and automation manufacturing process. Honeywell always focuses on the long-term reliability of TIMs and has achieved excellent results.