Does Mercedes EQXX concept signal a shift to air-cooling for EV batteries? – EV Updates 2022

Does Mercedes EQXX concept signal a shift to air-cooling for EV batteries? – EV Updates 2022

Does Mercedes EQXX concept signal a shift to air-cooling for EV batteries? – EV Updates 2022

Launched earlier this week in the Mercedes-Benz Vision EQXX concept car, the range topped the list with an astonishing claim of 6 miles over 6 miles, with an astonishing 621 real world miles (or more) from a battery pack of less than 100 kwh. Kwh in terms of performance.

By achieving that capability, the sequence of intriguing technical details attracted an F1-like level of attention — that is, from the company’s experience in F1 racing on many fronts, to those in the neighborhood who were accustomed to tuning in to Nürburgring.

Nevertheless, EQXX’s battery pack — one of the many components that executives have pointed out to be manufactured — takes an approach that none of the F1, Formula E or any other modern Mercedes EVs use: passive cooling, otherwise known. The air is cooler.

Mercedes Vision EQXX EV Concept

Mercedes Vision EQXX EV Concept

As Daimler AG’s chief technology officer Marcus Schaefer explained after revealing, this is accomplished with intelligent cell management throughout the pack, with an integrated cooling plate at the bottom and vents that open when the temperature rises.

Simply put, circulating pumps and fluids powered by cooling systems — usually two circuits — costs energy and efficiency.

In a Q&A session on Tuesday, Adam Allshop, Advanced Technical Director of Mercedes-AMG High Performance Powertrains, provided some more details on how the team achieved passive cooling beyond this top view. He also called the design of the pack and its performance parameters a “good circle” around efficient cells.

A nice circle that keeps it cool

“That means we didn’t chase the highest performance, we didn’t push the cell,” Alsab explained. Green car reports, That means they can go for the passive cooling option. “This means that we can actually work to reduce the profile of the battery and fit a larger power content in a much smaller space.”

Mercedes-Benz claims a power density of approximately 400 watts-hour per liter per pack — not up to the energy density of the cylinder-cell packs used by Tesla, but far superior to other current packs that use its prismatic cell design. .

Mercedes EQXX concept battery

Mercedes EQXX concept battery

The new strategy is part of a cell-to-pack battery design that is directly affected by F1, with a 20% increase in cell power density and an overall pack of 30% lighter and half the size of EQS. The company said other suppliers, including CATL, which supplies cells for EQS, were involved in the project.

However, passive cooling or air conditioning is very rare in modern EVs today — only encountered in some used EVs, including Nissan Leaf, newer models, and the Volkswagen e-Golf.

Lessons from the leaf?

Tesla CEO Elon Musk called Nissan’s cooling approach to the Leaf Primitive a decade ago – at a time when liquid-cooling systems at Tesla Roadster and Chevy Volt were considered sophisticated. Musk accurately predicted that the set of leaves would experience “major degradation” in cold weather and “freeze” at warmer temperatures – although Nissan did better with some changes in the chemistry.

To that, the Mercedes team claims that some real-world tests have not yet been done — especially when the brand is known for the longevity of its models. “We did a single-cell test on the growth cells, and we did a battery level test, but we haven’t done a full lifetime test yet,” AllSop said briefly. “This is also part of what we learn as we begin to test EQXX more.”

As executives have emphasized with the introduction of EQXX, most of the key technology pieces on display in this concept are subject to production — most of which support the modular MMA framework. Then in the decade. Although the air conditioning is not locked yet, there should already be a relatively high level of confidence in the end.

Some things are fun to come full circle. Liquid cooling was once a novelty. Now the invention may involve eliminating the need for liquid cooling – at least for cars that do not focus on performance.

electric vehicles updates India

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Does Mercedes EQXX concept signal a shift to air-cooling for EV batteries? – EV Updates 2022

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