The Volkswagen Group said it had concluded the planned increase in its stake in the California technology company QuantumScape.
The Committee on Foreign Investment in the United States (CFIUS) had no objection to the transaction, the automakers said.
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VW is spending US$100m on the battery specialist, becoming its largest automotive shareholder. It will now take a seat on the QuantumScape board of directors.
The two companies have formed a joint venture to enable an industrial level of production of solid state batteries.
Volkswagen is contributing its expertise in production and scaling projects while QuantumScape brings solid-state battery knowledge to the JV.
The pair plan a production line for such batteries by 2025.
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By GlobalDataSolid-state battery cell technology is seen as the most promising approach for the next but one generation of e-mobility. It has several advantages over the present lithium-ion technology: higher energy density, enhanced safety, better fast charging capability and a much smaller space requirement.
VW has already tested QuantumScape early stage solid state battery sample cells in Germany, running at automotive rates of power.
Founded in 2010, QuantumScape is based in San Jose, California.
