Boston-Power Inc., a Westborough-based company focused on lithium-ion battery cells, said Wednesday that founder Christina Lampe-Onnerud has resigned from the company’s board of directors.

Just over a year ago, the company said it was receiving $125 million in new funding from a combination of private equity investment and support from China. Although the company has its headquarters in Massachusetts, it has a technology center in Beijing and manufacturing operations in Asia, its website says.

Some automakers think that lithium-ion batteries have major potential for electric vehicles.

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At that time that the company announced the $125 million in new funding, Lampe-Onnerud said: “The electric vehicle focus is really what’s driving that. Our biggest customers are in China.”

A few years earlier, Boston-Power lost out on $100 million in federal stimulus money that it had planned to use to build a 450,000-square-foot battery plant in Auburn.

In a statement Wednesday, Boston-Power chairman Sonny Wu said: “The Boston-Power board of directors joins me in expressing our appreciation of Christina’s contribution to Boston-Power, as its founder, in passionately developing the company into the EV battery technology leader it is today as well as helping with the transition over the past year with the company’s expansion in China. We know that Christina will continue to be an enormous success. With the recent additions of Tony Shen and Dr. Wayne Yuan to our executive management team as well as leveraging the existing technology leadership with the Westborough R&D team, and our continued momentum in China, we are confident that we will be able to achieve her vision of making Boston-Power into a major supplier of EV battery systems to customers around the globe.”