Panasonic Corporation and Tesla Motors have announced that the two companies have reached an agreement in which Panasonic will expand its supply of automotive-grade lithium-ion battery cells to Tesla.

Under the agreement, the two companies will update and expand their 2011 arrangement to now supply nearly 2 billion cells over the course of four years.

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The lithium-ion battery cells purchased from Panasonic will be used to power the Model S as well as Model X, a performance utility vehicle that is scheduled to go into production by the end of 2014.

This agreement builds upon a multi-year collaboration between Panasonic and Tesla to develop next-generation automotive-grade battery cells and accelerate the market expansion of electric vehicles. Panasonic’s cells combined with Tesla’s EV battery expertise have already enabled more than 130 million customer miles driven in Tesla Roadsters and Model S.

“This expanded agreement with Panasonic is important to Tesla as we continue to increase the pace of production,” said Tesla Co-Founder and CEO Elon Musk. “We look forward to strengthening our relationship with Panasonic, and I’m confident that this partnership will continue to be an integral part ofit oc Tesla’s success for years to come.”

The two companies say that they have developed a next-generation battery cell technology that “provides the highest energy density and best performance cells in the market”.

Panasonic’s cylindrical cell is a “customised technology designed specifically for optimising electric vehicle quality and life”. These cells are integrated by Tesla into the battery pack in a way that enables a range of approximately 265 miles for the Model S, it is claimed.

“We are extremely proud to be a strategic partner of Tesla,” said Yoshihiko Yamada, president of the Automotive & Industrial Systems Company, an internal company of Panasonic. “Panasonic will increase its production capacity of lithium-ion battery cells to supply Tesla’s growing needs as it expands its production of EVs.”

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