Volkswagen’s strategy for batteries

Volkswagen e-Golf battery

 

It has pros and cons.

 

Volkswagen’s strategy for batteries could be resumed to using the same cells for BEVs and PHEVs. It has its pros and cons. But we’ll look into it ahead.

 

Volkswagen currently uses 25 Ah NMC cells made by Sanyo (owned by Panasonic) to make the batteries for its BEVs and PHEVs.

While it’s not easy to find simple information like weight and volume of these cells, Joachim from endless-sphere.com forum got some units and we now have some data.

 

Volkswagen cell module made with Sanyo NMC cells (6s2p)

 

Weight: 724 g

Dimensions: 14,7 x 9 x 2,5 cm

Volume: 0,33075 L

Nominal capacity: 25 Ah

Nominal voltage: 3,667 V

Volumetric energy density: 277 Wh/L

Gravimetric energy density: 126 Wh/kg

 

Sanyo 25 Ah cell used by Volkswagen

 

But these 25 Ah cells are about to be replaced.

In January 2017 Volkswagen will start replacing the 25 Ah Panasonic/Sanyo cells with 37 Ah Samsung SDI cells.

Nevertheless even the new cells have average energy density, not great, because they are a compromise.

Usually automakers use different cells for BEVs and PHEVs, cells with more energy density are used in BEVs and cells with more power density are used in PHEVs. Volkswagen is the exception, the automaker uses the same cells for BEVs and PHEVs. This means that the cell’s characteristics are a compromise between energy and power density. The cells will never have an energy density nor a power density as good as they could, this is the biggest disadvantage of this strategy.

 

But there are a lot of advantages.

 

  • Using the same kind of cell in every plugin car allows Volkswagen to use volume to negotiate prices with the cell maker.
  • The cell maker can focus on just one kind of cell, maximizing resources for R&D (Research and Development) and minimizing production costs by requiring less machinery.
  • It makes battery upgrades easier. When a new higher capacity cell is introduced it can easily be used in every Volkswagen plugin car. This is what will happen with the introduction of the 37 Ah cell to every BEV and PHEV made by the Volkswagen Group.

 

In 2017 Volkswagen will surely have one of the lowest costs per kWh, certainly below 140 €.

These are the plugin cars of the Volkswagen Group that will use the 37 Ah cells:

 

  • Volkswagen e-Golf
  • Volkswagen e-up
  • Volkswagen Golf GTE
  • Volkswagen Passat GTE
  • Audi A3 e-tron
  • Audi Q7 e-Tron
  • Porsche Cayenne S E-Hybrid
  • Porsche Panamera 4 E-Hybrid

 

The third party battery maker, Kreisel Electric also uses only one type of cell to make its modules. In this case 18650 cylindrical cells. This makes replacing the cell supplier or start using a new more energy dense cell a lot easier.

The same applies to Tesla Motors, that always use the same tiny cells in every electric car battery they make. But in Tesla Motors and Kreisel Electric cases, they only make batteries for BEVs, so they don’t need to compromise both power and energy densities. They clearly favor energy density.

 

In this field the Renault-Nissan Alliance can do a lot more to reduce costs. Sharing the same cells for Zoe’s and Leaf’s batteries should be already happening, but I guess we’ll have to wait for the 43 kWh LG Chem batteries for it to finally happen.

 

Update: this article was revised because I wrongly assumed that the new 37 Ah battery cells would be made by Volkswagen’s current supplier (Panasonic/Sanyo), but instead, these new cells are made by Samsung SDI.

 

 

More info:

https://endless-sphere.com/forums/viewtopic.php?f=14&t=79639

http://www.volkswagenag.com/content/vwcorp/info_center/en/talks_and_presentations/2014/07/FM_04_07_14.bin.html/binarystorageitem/file/06_2014-07-04+Presentation+Barclays+London+Steiger+TOP+COPY.pdf

Pedro Lima

More than natural resources, are wasted human resources that bothers me the most. That's why I'm a strong advocate of a society based on cooperation, not competition, that helps every individual to reach his full potential so that he can contribute back to society. "From each according to his ability, to each according to his needs".

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6 Responses

  1. Frank says:

    do you still think the Leaf 2017 will have this new 43 kwh battery? From what you know, will it be a battery with thermal management? (Leaf/Zoé)

    • Pedro Lima says:

      Yes, it will have a roughly 43 kWh battery. It still unknown if Leaf and Zoe will share the same battery, but it’s what makes sense. This is also what Carlos Ghosn has been promising for a while. Renault and Nissan sharing electric car parts to reduce costs.

      Batteries with LG Chem cells always have TMS, otherwise LG Chem wouldn’t give warranty for the cells.

  2. Christian says:

    Have you read about the e-Crafter? 312 cells (probably 104S3P) with 37Ah equals 43kWh.
    Way to go VW Commercial Vehicles!

    Cheers, Christian

    http://ecomento.tv/2016/09/22/ab-2017-vw-elektro-transporter-e-crafter/

    • Pedro Lima says:

      Hello Christian

      Yes I did. But now I’m in a process of upgrading the website server to a faster one, so I can’t focus in writing.

      It’s great to see the new 37 Ah cells coming to more VW EVs.

      • Fernando Marques says:

        The website seems fast enough to me. I visit frequently and never experienced a slowdown.

        Christian, from VW i never know if it’s good information or just vaporware

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