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Combustion is out, coulombs are in for the future of transportation.

Stephen Moore

October 15, 2021

3 Min Read
automotive coolant line made from Ryton PPS
Coolant lines for automotive applications made with Solvay's Ryton PPS.Image: Solvay

Emission reductions, either voluntary on the part of automakers or prompted via regional and national mandates and legislation, are driving the car industry in the direction of electric, with hybrid solutions to boot. The ensuing revolution in drivetrain technology has placed suppliers at the forefront in developing solutions to ensure vehicle safety and performance on the road, particularly pertaining to the lithium-ion batteries at the core of it all.

Speaking to PlasticsToday at the Fakuma show in Friedrichshafen, Germany, Nicolas Batailley, E-Mobility Marketing Manager, Solvay Specialty Polymers (L’Isle d’Abeau, France) highlighted a battery cage that the company had developed to protect the battery if an accident occurred. The compact, 48-V battery is housed in reinforced Amodel PPA “developed only for safety reasons,” emphasizes Batailley.

Thermal management is another area of battery technology where engineering plastics play a key role and, in most cases, “customers ask for coolant lines,” notes Batailley. “[Here], we have developed PPS grades for extruding cooling lines which are micro stabilized and mostly flame retardant, depending on the grade.”

Batailley also sees autonomous driving as a key future influencer of material selection. “Not next year, but probably by 2030 it will be there. It will have a huge impact in terms of material selection,” he says. “Engineering plastics will be deployed extensively in sensors, LiDAR, and radars. If these don’t work [as intended], well, the car is no longer autonomous,” he notes. Solvay is working on different solutions that are best for the sensors and LiDAR. Simply keeping the lens clean is an issue, for example. “You also have transparency issues — the radar signal needs to go through the plastic, so the car isn’t driving blind.” He adds, “You can put the LiDAR on top of the car, but that doesn’t look attractive, so you may want to hide it somewhere, but that generates its own set of problems if the waves can’t penetrate.”

Solvay has undoubtedly been successful in developing several solutions for e-mobility, as evidenced by its recent receipt of several awards from the Society of Plastics Engineers (SPE). First place in the New Mobility category of the awards went to a rotor slot liner molded with Xydar LCP, followed by a second place finish in the Enabler category for a magnet wire insulation in KetaSpire PEEK, and a third place in the Powertrain category for a coolant line using Ryton PPS.

Slot liner

The award-winning slot liner is just 0.65-mm thick with a flow length of 220 mm.

The slot liner is an injection-molded 30% glass-fiber-reinforced and flame-retardant liquid crystal polymer (LCP) by Italy’s Cobraplast for one of Germany’s foremost automotive manufacturers. The part is used in the rotor design of an advanced-generation electric drive traction motor, where it provides a barrier between the copper windings and steel lamination of the rotor.

In this small but critical application, Xydar LCP replaces incumbent multi-layer films and reportedly provides significant cost and performance advantages. The material combines exceptional flowability to fill 0.65-mm thin sections over a length of 220 mm with zero warpage to meet tight tolerance specifications. In addition, it also ensures high stiffness to prevent breakage during assembly.

The coolant lines referred to by Batailley are produced with extruded Ryton polyphenylene sulfide (PPS) XE 3500 (unfilled) and XE 5430 (30% glass-filled), complete with connectors injection molded in Ryton R4-270 (40% glass-filled). Widely proven for cooling and venting lines in the high-heat environment of downsized internal combustion engines, Ryton PPS also provides the chemical resistance, mechanical strength, and flame retardancy needed for battery cooling lines in electric vehicles. In these applications, the polymer replaces lower performing polyamides as well as metals, which helps OEMs benefit from the lightweighting possibilities with plastics also in chemically and mechanically more demanding fluid-handling systems.

Norbert Sparrow contributed to this article.

About the Author(s)

Stephen Moore

Stephen has been with PlasticsToday and its preceding publications Modern Plastics and Injection Molding since 1992, throughout this time based in the Asia Pacific region, including stints in Japan, Australia, and his current location Singapore. His current beat focuses on automotive. Stephen is an avid folding bicycle rider, often taking his bike on overseas business trips, and is a proud dachshund owner.

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