Freudenberg Sealing Technologies has created thermal boundaries that help to slow down thermal runaway in Li-ion batteries by expanding resistance to propagation. The new 3D thermal barriers can be made use of at many positions inside the battery and have now proven reliable in their preliminary sequence productions, in accordance to the company.
A lot more than 100 million electrical autos are predicted to be on roads globally by 2030. To make electromobility more economical in the long run, several manufacturers are working on obtaining greater ranges and shorter charging instances high-overall performance batteries are one particular of the priorities in this progress. But in lithium-ion batteries, increased vitality density improves the hazard of thermal runaway.
What is fully new is that the thermal limitations are now also available in tailored, flexible 3D geometries, which can make it doable to use them in a variety of positions in just the battery and will allow for integration of further parts.
—Andrew Espinoza, Worldwide Vice President Know-how of the Oil Seals Powertrain & Driveline Division at Freudenberg Sealing Systems
Thermal runaway, which is the ignition or explosion of a battery mobile prompted by a self-reinforcing heating process, is a considerable security challenge. It can be brought on by a variety of inside and external aspects, this sort of as overcharging, excessive discharging, damage, or heating of the battery. Thermal runaway releases not only flames and incredibly hot gases but also electrically conductive particles. These in convert can cause thermal propagation in adjacent cells and direct to shorter circuits in the electrical system. Thermal obstacles act as protecting levels that gradual down or even protect against the heat and flames from spreading in the battery, which significantly will increase protection.
Over and above the existing two-dimensional limitations, these as flat mats and thermal blankets, the 3D variant opens completely new options. Customer-precise, three-dimensional geometries can be generated in a range of large and low volume manufacturing procedures, this sort of as injection molding and continual extrusion.
Profile seals, module separators and handles, which includes those for bus bars, cooling lines or electrical components are a few of the products now currently being manufactured. The made, advanced 3D geometries are lightweight and have negligible impression on the battery’s general excess weight.
Specifically for these programs, products experts at Freudenberg Sealing Technologies have designed warmth-resistant, electrical, and thermal insulating products. Screening of these elements has been done in-property, proving that they can properly stand up to temperatures of up to 1,200 °C. It is their distinctive composition that can make these compounded polymers so particularly heat-resistant.
It also tends to make them resistant against particle impacts, these types of as those people that take place when cells are vented. The 3D thermal boundaries benefit from elastomer alternatives, whether in solid kind or as a foam, as well as plastic factors these types of as Quantix Extremely, which allows elaborate geometries.
The a few-dimensional thermal barriers and the utilized supplies have absent as a result of considerable testing that exceeds the required standards. They have demonstrated their superb performance and dependability on bench exams as nicely as battery program testing. The solutions satisfy the highest high quality standards, are licensed pursuant to UL 94 V- and are previously being utilized efficiently in original sequence manufacturing for the automotive market.